Form 10-Q/A - Quarterly report [Sections 13 or 15(d)]: [Amend]

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

__________________________________________________

FORM 10-Q/A

(Amendment No. 1)

__________________________________________________

(Mark One)


x			QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2023


o			TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ______ to

000-32743

(Commission File Number)

__________________________________________________

DZS INC.

(Exact name of registrant as specified in its charter)

__________________________________________________


Delaware			22-3509099
(State or other jurisdiction of incorporation or organization)			(I.R.S. Employer Identification Number)

5700 Tennyson Parkway, Suite 400 Plano, Texas			75024
(Address of principal executive offices)			(Zip code)

(469) 327-1531

(Registrant’s telephone number, including area code)

__________________________________________________

Securities registered pursuant to Section 12(b) of the Act:


Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common stock, $0.001 par value	DZSI	The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes o No x

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes o No x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in rule 12b-2 of the Exchange Act.

Large accelerated filer

Accelerated filer

Non-accelerated filer

Smaller reporting company

Emerging growth company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No x


As of July 22, 2024, there were 38,024,783 shares outstanding of the registrant’s common stock, $0.001 par value.

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EXPLANATORY NOTE

Subsequent to the issuance of the unaudited condensed consolidated financial statements as of March 31, 2023 and as previously disclosed on June 1, 2023, Management determined that the Company’s previously issued unaudited consolidated financial statements as of and for the three months ended March 31, 2023 (the “Q1 2023 Financial Statements”) contained a material accounting error relating to the timing of revenue recognition with respect to certain customer projects. As a result of this error, the Audit Committee determined that the Company’s Q1 2023 Financial Statements should no longer be relied upon and should be restated. In addition, as a result of the error, the Audit Committee initiated a review of the Company’s accounting for revenue recognition and the extent to which these matters affect the Company’s internal controls over financial reporting (the “Review”).

On November 9, 2023, the Company disclosed that although the Review was still ongoing, based on preliminary findings, management had determined that the Company’s previously issued audited consolidated financial statements as of and for the year ended December 31, 2022 (the “2022 Annual Financial Statements”), as well as the Company’s previously issued unaudited condensed consolidated financial statements as of and for each of the three months ended March 31, 2022, the three and six months ended June 30, 2022 and the three and nine months ended September 30, 2022 (collectively, the “2022 Interim Financial Statements” and, together with the 2022 Annual Financial Statements, the “2022 Financial Statements” and, together with the Q1 2023 Financial Statements, the “Affected Financial Statements”), should no longer be relied upon and should be restated due to accounting errors in each of the 2022 Financial Statements relating to revenue recognition.

During the course of the Review, and during the Company's subsequent assessment of its accounting practices, accounting and financial reporting errors were identified. Specifically, errors in timing of revenue recognition relating to incorrect shipping dates, incorrect or unapproved shipping terms, incorrect timing of the transfer of control, and incorrect evaluation of the existence of contracts. As a result, revenue, accounts receivable, contract assets and liabilities, inventory and cost of sales, goodwill, and the tax provision contained errors which resulted in corrections in accounting under U.S. GAAP related to the timing of revenue recognition under certain customer projects. See Restatement Note 1 to this Quarterly Report on Form 10-Q/A.

We are filing this Amendment No. 1 to the Quarterly Report on Form 10-Q (“Form 10-Q/A”) for the quarterly period ended March 31, 2023, which was filed with the United States Securities and Exchange Commission (“SEC”) on May 9, 2023 (the “Original Filing”), to reflect restatements of the Condensed Consolidated Balance Sheets at March 31, 2022 and March 31 2023, the Condensed Consolidated Statements of Comprehensive Loss for the three months ended March 31, 2022 and March 31, 2023, and Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2022 and March 31, 2023, and the related notes thereto.

The following sections in the Original Filing are revised in this Form 10-Q/A, solely as a result of, and to reflect, the restatement:

Part I – Item. Financial Statements

Part I - Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Part I - Item 3. Quantitative and Qualitative Disclosures about Market Risk

Part I - Item 4. Controls and Procedures

Part II - Item 1. Legal Proceedings

Part II - Item 1A. Risk Factors

Part II - Item 6. Exhibits

Pursuant to the rules of the SEC, Part II, Item 6 of the Original Filing has been amended to include the currently-dated certifications from our principal executive officer and principal financial officer, as required by Sections 302 and 906 of the Sarbanes-Oxley Act of 2002. The certifications of the principal executive officer and principal financial officer are included in this Form 10-Q/A as Exhibits 31.1, 31.2 and 32.1.

For the convenience of the reader, this Form 10-Q/A sets forth the information in the Original Filing in its entirety, as such information is modified and superseded where necessary to reflect the restatement. This Form 10-Q/A should be read in conjunction with our filings with the SEC subsequent to the date of the Original Filing, in each case as those filings may have been, or with respect to filings for the Non-Reliance Periods will be, superseded or amended.

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TABLE OF CONTENTS


		Page
PART I. FINANCIAL INFORMATION

Item 1.	Financial Statements	3
	Unaudited Condensed Consolidated Balance Sheets	3
	Unaudited Condensed Consolidated Statements of Comprehensive Loss	4
	Unaudited Condensed Consolidated Statements of Stockholders' Equity	5
	Unaudited Condensed Consolidated Statements of Cash Flows	6
	Notes to Unaudited Condensed Consolidated Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	28
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	36
Item 4.	Controls and Procedures	36

PART II. OTHER INFORMATION

Item 1.	Legal Proceedings	40
Item 1A.	Risk Factors	40
Item 5.	Other Information	40
Item 6.	Exhibits	40
	Signatures	42

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PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

DZS INC. AND SUBSIDIARIES

Unaudited Condensed Consolidated Balance Sheets

(In thousands, except par value)


	March 31, 2023		December 31, 2022
	(As Restated)
Assets
Current assets:
Cash and cash equivalents	$	28,892	$	34,347
Restricted cash	1,975		3,969
Accounts receivable - trade, net of allowance for credit losses of $16,087 as of March 31, 2023 and $16,184 as of December 31, 2022	106,291		134,471
Other receivables	20,752		16,144
Inventories	97,311		94,288
Contract assets	605		576
Prepaid expenses and other current assets	10,408		7,410
Total current assets	266,234		291,205
Property, plant and equipment, net	7,135		9,478
Right-of-use assets from operating leases	11,971		12,606
Goodwill	12,594		12,594
Intangible assets, net	30,422		31,742
Other assets	17,013		15,536
Total assets	$	345,369	$	373,161
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable - trade	$	107,904	$	118,667
Short-term debt – bank, trade facilities and secured borrowings	16,746		9,706
Current portion of long-term debt, net	23,660		24,073
Contract liabilities	16,614		18,705
Operating lease liabilities	4,859		4,834
Accrued and other liabilities	27,645		25,562
Total current liabilities	197,428		201,547

Contract liabilities - non-current	6,584		7,788
Operating lease liabilities - non-current	10,499		11,417
Pension liabilities	11,060		11,021
Other long-term liabilities	2,583		2,806
Total liabilities	228,154		234,579
Commitments and contingencies (Note 13)
Stockholders’ equity:
Common stock, 36,000 shares authorized, 31,102 and 30,968 shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively, at $0.001 par value	31		30
Preferred stock, $0.001 par value, 25,000 shares authorized and no shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively	—		—
Additional paid-in capital	276,282		271,884
Accumulated other comprehensive loss	(6,611)		(4,662)
Accumulated deficit	(152,487)		(128,670)
Total stockholders’ equity	117,215		138,582
Total liabilities and stockholders’ equity	$	345,369	$	373,161

See accompanying notes to unaudited condensed consolidated financial statements.

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DZS INC. AND SUBSIDIARIES

Unaudited Condensed Consolidated Statements of Comprehensive Loss

(In thousands, except per share data)


	Three Months Ended March 31,
	2023		2022
	(As Restated)
Net revenue	$	69,812	$	71,990
Cost of revenue	47,318		46,599
Gross profit	22,494		25,391
Operating expenses:
Research and product development	14,851		11,844
Selling, marketing, general and administrative	24,781		17,742
Restructuring and other charges	4,152		436
Amortization of intangible assets	1,271		294
Total operating expenses	45,055		30,316
Operating loss	(22,561)		(4,925)
Interest expense, net	(792)		(90)
Other income (expense), net	728		(800)
Loss before income taxes	(22,625)		(5,815)
Income tax provision	1,192		1,771
Net loss	(23,817)		(7,586)

Foreign currency translation adjustments (a)	(1,889)		(268)
Actuarial loss	(60)		—
Comprehensive loss	$	(25,766)	$	(7,854)
Net loss per share
Basic	$	(0.77)	$	(0.28)
Diluted	$	(0.77)	$	(0.28)
Weighted average shares outstanding
Basic	31,045		27,530
Diluted	31,045		27,530

(a)Includes net gain of $0.2 million and net loss of $0.4 million on intra-entity foreign currency transactions that are of a long-term investment nature for three months ended March 31, 2023 and 2022.

See accompanying notes to unaudited condensed consolidated financial statements.

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DZS INC. AND SUBSIDIARIES

Unaudited Condensed Consolidated Statements of Stockholders' Equity

(In thousands)


	Common stock			Additional paid-in capital		Accumulated other comprehensive loss		Accumulated deficit		Total stockholders' equity
	Shares	Amount
Three months ended March 31, 2023:
Balance as of December 31, 2022 (As Restated)	30,968	$	30	$	271,884	$	(4,662)	$	(128,670)	$	138,582
Issuance of common stock upon vesting of restricted stock units, exercise of stock options and employee stock plan purchases, net of shares withheld for taxes	134	1		(88)		—		—		(87)
Stock-based compensation	—	—		4,486		—		—		4,486
Net loss (As Restated)	—	—		—		—		(23,817)		(23,817)
Other comprehensive loss (As Restated)	—	—		—		(1,949)		—		(1,949)
Balance as of March 31, 2023 (As Restated)	31,102	$	31	$	276,282	$	(6,611)	$	(152,487)	$	117,215











Three months ended March 31, 2022:
Balance as of December 31, 2021	27,505	$	27	$	223,336	$	(4,457)	$	(86,999)	$	131,907
Cumulative effect of ASC 326 adoption	—	—		—		—		(401)		(401)
Issuance of common stock upon vesting of restricted stock units, exercise of stock options and employee stock plan purchases, net of shares withheld for taxes	98	—		156		—		—		156
Stock-based compensation	—	—		2,671		—		—		2,671
Net loss	—	—		—		—		(7,586)		(7,586)
Subsidiary dissolution	—	—		—		(68)		—		(68)
Other comprehensive loss	—	—		—		(268)		—		(268)
Balance as of March 31, 2022	27,603	$	27	$	226,163	$	(4,793)	$	(94,986)	$	126,411

See accompanying notes to unaudited condensed consolidated financial statements.

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DZS INC. AND SUBSIDIARIES

Unaudited Condensed Consolidated Statements of Cash Flows

(In thousands)


	Three months ended March 31,
	2023		2022
	(As Restated)
Cash flows from operating activities:
Net loss	$	(23,817)	$	(7,586)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,465		1,081

Amortization of deferred financing costs	60		—
Stock-based compensation	4,486		2,671
Provision for inventory write-down	1,086		705
Provision for credit losses, net of recoveries	(184)		(752)
Provision for sales returns	541		1,448
Provision for warranty expense	70		121
Unrealized loss on foreign currency transactions	1,396		874
Subsidiary dissolution	—		(68)
Loss on disposal of property, plant and equipment	40		—

Changes in operating assets and liabilities, excluding effects of acquisition:
Accounts receivable	26,466		6,418
Other receivable	(7,449)		126
Inventories	(2,060)		(14,557)
Contract assets	(29)		1,261
Prepaid expenses and other assets	(3,818)		(4,557)
Accounts payable	(11,316)		1,586
Contract liabilities	(3,265)		(43)
Accrued and other liabilities	159		540
Net cash used in operating activities	(15,169)		(10,732)
Cash flows from investing activities:
Proceeds from disposal of property, plant and equipment and other assets	1,790		—
Purchases of property, plant and equipment	(775)		(1,317)

Net cash provided by (used in) investing activities	1,015		(1,317)
Cash flows from financing activities:


Repayments of long-term borrowings	(313)		—
Proceeds from short-term borrowings and line of credit, net	8,918		—
Proceeds from related party term loan	4,059		—
Repayments of related party term loan	(5,845)		—
Payments for debt issue costs	(122)		(178)

Proceeds from exercise of stock awards and employee stock plan purchases	(87)		156
Net cash provided by (used in) financing activities	6,610		(22)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	96		(903)
Net change in cash, cash equivalents and restricted cash	(7,448)		(12,974)
Cash, cash equivalents and restricted cash at beginning of period	38,464		53,639
Cash, cash equivalents and restricted cash at end of period	$	31,016	$	40,665

Reconciliation of cash, cash equivalents and restricted cash to condensed consolidated balance sheets
Cash and cash equivalents	$	28,892	$	34,160
Restricted cash	1,975		6,343
Long-term restricted cash	149		162
	$	31,016	$	40,665

Supplemental disclosure of cash flow information:
Cash paid during the period for:
Interest - bank and trade facilities	$	660	$	36
Interest - related party	$	64	$	—
Income taxes	$	480	$	283

See accompanying notes to unaudited condensed consolidated financial statements.

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Notes to Unaudited Condensed Consolidated Financial Statements

(1) Organization and Summary of Significant Accounting Policies

(a) Description of Business

DZS Inc. (referred to, collectively with its subsidiaries, as “DZS” or the “Company”) is global provider of access and optical networking infrastructure and cloud software solutions that enable the emerging hyper-connected, hyper-broadband world and broadband experiences. The Company provides a wide array of reliable, cost-effective networking technologies and software to a diverse customer base.

DZS was incorporated under the laws of the state of Delaware in June 1999. The Company is headquartered in Plano, Texas with contract manufacturers and original design manufacturers located in the U.S, India, Korea, China, Taiwan, and Vietnam. The Company also maintains offices to provide sales and customer support at global locations. Through 2022, we also utilized our in-house manufacturing facility in Seminole, Florida. In October 2022, we announced an agreement with Fabrinet, a third-party provider of electro-mechanical and electronic manufacturing and distribution services, to transition the sourcing, procurement, order-fulfillment, manufacturing and return merchandise authorization activities in the Company's Seminole facility to Fabrinet. The transition began in October 2022 and substantially completed in the beginning of 2023, whereupon the Company no longer manufactures its products.

(b) Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and with the instructions to Form 10-Q and Article 3 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. These financial statements include the accounts of the Company and its wholly owned subsidiaries. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements of the Company and notes thereto included in the Company’s Annual Report on Form 10-K/A for the year ended December 31, 2022 filed with the Securities and Exchange Commission (“SEC”) on August 12, 2024. For a complete description of what the Company believes to be the critical accounting policies and estimates used in the preparation of its unaudited condensed consolidated financial statements, refer to the Company’s Annual Report on Form 10-K/A for the year ended December 31, 2022.

All intercompany transactions and balances have been eliminated in consolidation. The unaudited condensed consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments) that, in the opinion of management, are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the current interim period are not necessarily indicative of results to be expected for the current year or any other period.

The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. GAAP, assuming the Company will continue as a going concern.

We continue to be exposed to macroeconomic pressures in the post-COVID-19 environment, including concerns about energy costs, geopolitical issues, inflation, the availability and cost of credit, business and consumer confidence, and unemployment. We have seen improvement in our supply chain in 2023 as supply chain pricing, freight and logistics costs, product and component availability, and extended lead-times which were a challenge in 2021 and 2022 begin to alleviate in 2023 as the world economy recovers from the COVID-19 pandemic. We expect elevated costs for components and expedite fees to further improve throughout 2023.

We conduct significant business in South Korea, Japan, Vietnam, India, Spain, and Canada, as well as in other countries in Europe, Asia-Pacific, Middle East and Latin America, all of which subject us to foreign currency exchange rate risk. The local currencies of our significant foreign subsidiaries are the South Korean Won ("KRW"), Japanese Yen ("JPY"), Euro ("EUR), and Pound Sterling ("GBP"). Revenues and operating expenses are typically denominated in the local currency of each country and result from transactions by our operations in these countries. However, a significant portion of our international cost of sales is denominated in the U.S. Dollar (“USD”).

As of March 31, 2023, the Company's debt obligation under the Term Loan was $23.7 million, net of unamortized issuance cost of $0.4 million, of which $1.3 million is scheduled for payment in the next 12 months. Due to the risk of non-compliance with certain financial covenants in the next 12 months we classified the entire amount as a current liability. As of March 31, 2023, we were in discussion with the lenders to amend the debt agreement to mitigate the risk of non-compliance. Refer to Note 16 Subsequent events for further information about the amendment and subsequent termination of the JPMorgan Credit Agreement.

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In addition to negotiating for revised financial covenants, we continue to focus on cost management, operating efficiency and efficient discretionary spending. Management is actively taking measures to enhance profitability and liquidity, including reducing the Company’s cost structure and cash outflows, including its investment in inventory, and managing receivable balances through aggressive collection efforts and tighter customers payment terms. These plans are not completely within the Company’s control, as some actions are dependent on the Company’s lenders, vendors and customers. However, the Company believes that it will maintain liquidity in the next 12 months to support its operations.

(d) Use of Estimates

The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ materially from those estimates.

(e) Restatement

Subsequent to the issuance of the unaudited condensed consolidated financial statements as of March 31, 2023 and as previously disclosed on June 1, 2023, Management determined that the Company’s previously issued unaudited consolidated financial statements as of and for the three months ended March 31, 2023 (the “Q1 2023 Financial Statements”) contained an accounting error relating to the timing of revenue recognition with respect to certain customer projects. As a result of this error, the Audit Committee determined that the Company’s Q1 2023 Financial Statements should no longer be relied upon and should be restated. In addition, as a result of the error, the Audit Committee initiated a review of the Company’s accounting for revenue recognition and the extent to which these matters affect the Company’s internal controls over financial reporting (the “Review”).

On November 9, 2023, the Company disclosed that although the Review was still ongoing, based on preliminary findings, management had determined that the Company’s previously issued audited condensed consolidated financial statements as of and for the year ended December 31, 2022 (the “2022 Annual Financial Statements”), as well as the Company’s previously issued unaudited condensed consolidated financial statements as of and for each of the three months ended March 31, 2022, the three and six months ended June 30, 2022 and the three and nine months ended September 30, 2022 (collectively, the “2022 Interim Financial Statements” and, together with the 2022 Annual Financial Statements, the “2022 Financial Statements” and, together with the Q1 2023 Financial Statements, the “Affected Financial Statements”), should no longer be relied upon and should be restated due to accounting errors in each of the 2022 Financial Statements relating to revenue recognition.

During the course of the Review, and during the Company's subsequent assessment of its accounting practices, accounting and financial reporting errors were identified. Specifically, errors in timing of revenue recognition relating to incorrect shipping dates, incorrect or unapproved shipping terms, incorrect timing of the transfer of control, and incorrect evaluation of the existence of contracts. As a result, revenue, accounts receivable, contract assets and liabilities, and inventory and cost of sales contained errors which resulted in corrections in accounting under U.S. GAAP related to the timing of revenue recognition under certain customer projects. Accordingly, the Company is restating its unaudited condensed consolidated financial statements for the three months ended March 31, 2022 and March 31, 2023, to correct these errors, the most significant of which are described below.

The amounts in the "As Previously Reported" columns are amounts derived from the Company's previously filed financial statements in its Quarterly Report on Form 10-Q, originally filed with the Securities and Exchange Commission on May 9, 2023. The amounts in the "Adjustments" columns present the impact of the accounting error corrections relating to the timing of revenue recognition with respect to certain customer projects along with other corrections to the Company's previously filed financial statements. The description of the corrections is referenced by (a) through (d) in the tables below. The amounts in the "As Restated" columns are the updated amounts including the impacts from the adjustments.

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The following table presents the effect of the restatement on the Company's previously reported unaudited condensed consolidated balance sheet as of March 31, 2023 (in thousands, except par value).


	March 31, 2023
	As Previously Reported		Adjustments			As Restated
Assets
Current assets:
Cash and cash equivalents	$	28,892	$	—		$	28,892
Restricted cash	1,975		—			1,975
Accounts receivable - trade, net	141,029		(34,738)		(a)	106,291
Other receivables	21,518		(766)		(d)	20,752
Inventories	69,722		27,589		(a)(d)	97,311
Contract assets	605		—			605
Prepaid expenses and other current assets	10,689		(281)		(b)	10,408
Total current assets	274,430		(8,196)			266,234
Property, plant and equipment, net	7,135		—			7,135
Right-of-use assets from operating leases	11,971		—			11,971
Goodwill	19,952		(7,358)		(c)	12,594
Intangible assets, net	30,422		—			30,422
Other assets	17,013		—			17,013
Total assets	$	360,923	$	(15,554)		$	345,369
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable - trade	$	107,904	$	—		$	107,904
Short-term debt – bank, trade facilities and secured borrowings	16,746		—			16,746
Current portion of long-term debt	23,660		—			23,660
Contract liabilities	19,476		(2,862)		(a)(c)	16,614
Operating lease liabilities	4,859		—			4,859
Accrued and other liabilities	29,615		(1,970)		(b)	27,645
Total current liabilities	202,260		(4,832)			197,428
Long-term debt	—		—			—
Contract liabilities - non-current	6,636		(52)		(a)	6,584
Operating lease liabilities - non-current	10,499		—			10,499
Pension liabilities	11,060		—			11,060
Other long-term liabilities	2,583		—			2,583
Total liabilities	233,038		(4,884)			228,154

Stockholders’ equity:
Common stock	31		—			31
Additional paid-in capital	276,282		—			276,282
Accumulated other comprehensive loss	(6,462)		(149)		(a)	(6,611)
Accumulated deficit	(141,966)		(10,521)		(a)(b)	(152,487)
Total stockholders’ equity	127,885		(10,670)			117,215
Total liabilities and stockholders’ equity	$	360,923	$	(15,554)		$	345,369

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(c) Error corrections relating to the timing of revenue recognition with respect to ASSIA pre-acquisition customer projects.

(d) Error corrections relating to the classification of certain transactions on the Company's previously reported consolidated balance sheet.

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The following table presents the effect of the restatement on the Company's previously reported consolidated balance sheet as of December 31, 2022 (in thousands, except par value).


	December 31, 2022
	As Previously Reported			Adjustments			As Restated
Assets
Current assets:
Cash and cash equivalents	$	34,347		$	—		$	34,347
Restricted cash	3,969			—			3,969
Accounts receivable - trade, net	153,780			(19,309)		(a)(d)	134,471
Other receivables	16,144			—			16,144
Inventories	78,513			15,775		(a)(d)	94,288
Contract assets	576			—			576
Prepaid expenses and other current assets	8,371			(961)		(b)	7,410
Total current assets	295,700			(4,495)			291,205
Property, plant and equipment, net	9,478			—			9,478
Right-of-use assets from operating leases	12,606			—			12,606
Goodwill	19,952			(7,358)		(c)	12,594
Intangible assets, net	31,742			—			31,742
Other assets	15,536			—			15,536
Total assets	$	385,014		$	(11,853)		$	373,161
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable - trade	$	121,225		$	(2,558)	(d)	$	118,667
Short-term debt – bank, trade facilities and secured borrowings	9,706			—			9,706
Current portion of long-term debt	24,073			—			24,073
Contract liabilities	21,777			(3,072)		(a)(c)	18,705
Operating lease liabilities	4,834			—			4,834
Accrued and other liabilities	27,559			(1,997)		(b)	25,562
Total current liabilities	209,174			(7,627)			201,547
Long-term debt	—			—			—
Contract liabilities - non-current	7,864			(76)		(a)	7,788
Operating lease liabilities - non-current	11,417			—			11,417
Pension liabilities	11,021			—			11,021
Other long-term liabilities	2,806			—			2,806
Total liabilities	242,282		242,282	(7,703)			234,579

Stockholders’ equity:
Common stock	30			—			30
Additional paid-in capital	271,884			—			271,884
Accumulated other comprehensive loss	(4,351)			(311)		(a)	(4,662)
Accumulated deficit	(124,831)			(3,839)		(a)(b)	(128,670)
Total stockholders’ equity	142,732			(4,150)			138,582
Total liabilities and stockholders’ equity	$	385,014		$	(11,853)		$	373,161

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(c) Error corrections relating to the timing of revenue recognition with respect to ASSIA pre-acquisition customer projects.

(d) Error corrections relating to the classification of certain transactions on the Company's previously reported consolidated balance sheet.

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The following table presents the effect of the restatement on the Company's previously reported unaudited condensed consolidated statement of comprehensive loss for the three months ended March 31, 2023 (in thousands, except per share data).


	Three Months Ended March 31, 2023
	As Previously Reported		Adjustments			As Restated
Net revenue	$	90,812	$	(21,000)	(a)	$	69,812
Cost of revenue	60,985		(13,667)		(a)	47,318
Gross profit	29,827		(7,333)			22,494
Operating expenses:
Research and product development	14,851		—			14,851
Selling, marketing, general and administrative	24,781		—			24,781
Restructuring and other charges	4,152		—			4,152
Amortization of intangible assets	1,271		—			1,271
Total operating expenses	45,055		—			45,055
Operating loss	(15,228)		(7,333)			(22,561)
Interest expense, net	(792)		—			(792)
Other income, net	728		—			728
Loss before income taxes	(15,292)		(7,333)			(22,625)
Income tax provision (benefit)	1,843		(651)		(b)	1,192
Net loss	(17,135)		(6,682)			(23,817)

Foreign currency translation adjustments	(2,051)		162		(a)	(1,889)
Actuarial loss	(60)		—			(60)
Comprehensive loss	$	(19,246)	$	(6,520)		$	(25,766)
Net loss per share
Basic	$	(0.55)	$	(0.22)		$	(0.77)
Diluted	$	(0.55)	$	(0.22)		$	(0.77)
Weighted average shares outstanding
Basic	31,045					31,045
Diluted	31,045					31,045

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

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	Three Months Ended March 31, 2022
	As Previously Reported		Adjustments			As Restated
Net revenue	$	77,040	$	(5,050)	(a)	$	71,990
Cost of revenue	50,215		(3,616)		(a)	46,599
Gross profit	26,825		(1,434)			25,391
Operating expenses:
Research and product development	11,844		—			11,844
Selling, marketing, general and administrative	17,742		—			17,742
Restructuring and other charges	436		—			436

Amortization of intangible assets	294		—			294
Total operating expenses	30,316		—			30,316
Operating loss	(3,491)		(1,434)			(4,925)
Interest income	37		—			37
Interest expense	(127)		—			(127)
Other expense, net	(800)		—			(800)
Loss before income taxes	(4,381)		(1,434)			(5,815)
Income tax provision (benefit)	(1,333)		3,104		(b)	1,771
Net loss	(3,048)		(4,538)			(7,586)

Foreign currency translation adjustments	(268)		—			(268)

Comprehensive loss	$	(3,316)	$	(4,538)		$	(7,854)
Net loss per share
Basic	$	(0.11)	$	(0.17)		$	(0.28)
Diluted	$	(0.11)	$	(0.17)		$	(0.28)
Weighted average shares outstanding
Basic	27,530					27,530
Diluted	27,530					27,530

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

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The following table presents the effect of the restatement on the Company's previously reported unaudited condensed consolidated statement of cash flows for the three months ended March 31, 2023 (in thousands).


	Three Months Ended March 31, 2023
	As Previously Reported		Adjustments			As Restated
Cash flows from operating activities:
Net loss	$	(17,135)	$	(6,682)	(a)(b)	$	(23,817)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,465		—			2,465

Amortization of deferred financing costs	60		—			60
Stock-based compensation	4,486		—			4,486
Provision for inventory write-down	1,086		—			1,086
Provision for credit losses, net of recoveries	(184)		—			(184)
Provision for sales returns	541		—			541
Provision for warranty	70		—			70
Unrealized loss on foreign currency transactions	1,396		—			1,396

Loss on disposal of property, plant and equipment	40		—			40

Changes in operating assets and liabilities:
Accounts receivable	11,033		15,433		(a)(d)	26,466
Other receivable	(5,511)		(1,938)		(d)	(7,449)
Inventories	7,051		(9,111)		(a)(d)	(2,060)
Contract assets	(29)		—			(29)
Prepaid expenses and other assets	(3,138)		(680)		(b)	(3,818)
Accounts payable	(13,875)		2,559		(d)	(11,316)
Contract liabilities	(3,493)		228		(a)	(3,265)
Accrued and other liabilities	131		28		(b)	159
Net cash used in operating activities	(15,006)		(163)			(15,169)
Cash flows from investing activities:
Proceeds from disposal of property, plant and equipment and other assets	1,790		—			1,790
Purchases of property, plant and equipment	(775)		—			(775)

Net cash provided by investing activities	1,015		—			1,015
Cash flows from financing activities:


Repayments of long-term borrowings	(313)		—			(313)
Proceeds from short-term borrowings and line of credit, net	8,918		—			8,918

Proceeds from related party term loan	4,059		—			4,059
Repayments of related party term loan	(5,845)		—			(5,845)
Payments for debt issue costs	(122)		—			(122)

Proceeds from exercise of stock awards and employee stock plan purchases	(87)		—			(87)
Net cash provided by financing activities	6,610		—			6,610
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(67)		163		(a)	96
Net change in cash, cash equivalents and restricted cash	(7,448)		—			(7,448)
Cash, cash equivalents and restricted cash at beginning of period	38,464		—			38,464
Cash, cash equivalents and restricted cash at end of period	$	31,016	$	—		$	31,016

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(d) Error corrections relating to the classification of certain transactions on the Company's previously reported consolidated balance sheet.

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	Three Months Ended March 31, 2022
	As Previously Reported		Adjustments			As Restated
Cash flows from operating activities:
Net loss	$	(3,048)	$	(4,538)	(a)(b)	$	(7,586)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,081		—			1,081


Stock-based compensation	2,671		—			2,671
Provision for inventory write-down	705		—			705
Provision for credit losses, net of recoveries	(752)		—			(752)
Provision for sales returns	1,448		—			1,448
Provision for warranty expense	121		—			121
Unrealized loss on foreign currency transactions	874		—			874
Subsidiary dissolution	(68)		—			(68)

Changes in operating assets and liabilities:
Accounts receivable	2,761		3,657		(a)	6,418
Other receivable	126		—			126
Inventories	(10,931)		(3,626)		(a)	(14,557)
Contract assets	1,261		—			1,261
Prepaid expenses and other assets	(7,577)		3,020		(b)	(4,557)
Accounts payable	1,586		—			1,586
Contract liabilities	(1,446)		1,403		(a)	(43)
Accrued and other liabilities	456		84		(b)	540
Net cash used in operating activities	(10,732)		—			(10,732)
Cash flows from investing activities:
Purchases of property, plant and equipment	(1,317)		—			(1,317)

Net cash used in investing activities	(1,317)		—			(1,317)
Cash flows from financing activities:



Payments for debt issue costs	(178)		—			(178)
Proceeds from exercise of stock awards and employee stock plan purchases	156		—			156
Net cash used in financing activities	(22)		—			(22)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(903)		—			(903)
Net increase in cash, cash equivalents and restricted cash	(12,974)		—			(12,974)
Cash, cash equivalents and restricted cash at beginning of period	53,639		—			53,639
Cash, cash equivalents and restricted cash at end of period	$	40,665	$	—		$	40,665

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

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(f) Disaggregation of Revenue

The following table presents revenues by product technology (in thousands):


	Three Months Ended March 31,
	2023		2022
	(As Restated)		(As Restated)
Access Networking Infrastructure	$	58,496	$	67,412
Cloud Software & Services	11,316		4,578
Total	$	69,812	$	71,990

The following table present revenues by geographical concentration (in thousands):


	Three Months Ended March 31,
	2023		2022
	(As Restated)		(As Restated)
Americas	$	24,975	$	22,924
Europe, Middle East, Africa	18,406		16,393
Asia	26,431		32,673
Total	$	69,812	$	71,990

(g) Concentration of Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash, cash equivalents and restricted cash, accounts receivables, and contract assets. Cash, cash equivalents and restricted cash consist of financial deposits and money market accounts that are principally held with various domestic and international financial institutions with high credit standing. As of March 31, 2023, the Company had cash accounts in excess of Federal Deposit Insurance Corporation ("FDIC") insured limits.

The Company’s customers include competitive and incumbent local exchange carriers, competitive access providers, internet service providers, wireless carriers and resellers serving these markets. The Company performs ongoing credit evaluations of its customers and generally does not require collateral. Allowances are maintained for potential doubtful accounts based upon the expected collectability of accounts receivable using historical loss rates adjusted for customer-specific factors and current economic conditions. The Company determines historical loss rates on a rational and systematic basis. The Company performs periodic assessments of its customers’ liquidity and financial condition through analysis of information obtained from credit rating agencies, financial statement review and historical and current collection trends.

Activity under the Company’s allowance for credit losses consists of the following (in thousands):


	Three Months Ended March 31,
	2023		2022
Balance at beginning of period	$	16,184	$	17,735
Charged to expense, net of recoveries	(184)		(752)
Cumulative effect of ASC 326 adoption	—		401
Foreign currency exchange impact	87		(326)
Balance at end of period	$	16,087	$	17,058

For the three months ended March 31, 2023, two customers accounted for 13% and 16% of net revenue. For the three months ended March 31, 2022, three customers accounted for 15%, 14%, and 13% of net revenue, respectively.

As of March 31, 2023 and December 31, 2022, no customers represented more than 10% of net accounts receivable.

As of March 31, 2023 and December 31, 2022, net accounts receivables from customers in countries other than the United States represented 81%.

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In 2017, the Company entered into an agreement with a customer in India to supply product for a state sponsored broadband project. The Company substantially completed its obligations under the agreement in 2018. The Company billed the customer, which is a state government sponsored entity, approximately $59.0 million and collected payments of approximately $41.7 million by December 31, 2020. In late March 2021, the customer’s state government parent experienced difficulty passing a budget impacting the ability of the customer to make remaining agreed-upon payments to us. In light of this development, the Company recorded an allowance that covered the entire balance unpaid by the customer. Subsequent to March 2021, the Company recovered approximately $2.5 million of accounts receivable related to the customer. As of March 31, 2023 the Company has a recorded allowance for credit losses of $13.1 million related to this receivable. The Company will continue to pursue collection of the entire outstanding balance and any amounts collected will be recognized in the period which they are received. In the event the Company’s efforts to collect from this customer prove unsuccessful, DZS may seek payment through other means, including through legal action.

(h) Business Combinations

We account for business combinations using the acquisition method, which requires the identification of the acquirer, the determination of the acquisition date and the allocation of the purchase price paid by the acquirer to the identifiable tangible and intangible assets acquired, the liabilities assumed, including any contingent consideration and any noncontrolling interest in the acquiree at their acquisition date fair values. Goodwill represents the excess of the purchase price over the fair value of net assets acquired, including the amount assigned to identifiable intangible assets. Identifiable intangible assets with finite lives are amortized over their expected useful lives. Acquisition-related costs are expensed in the periods in which the costs are incurred. The results of operations of acquired businesses are included in our consolidated financial statements from the acquisition date.

(i) Restructuring and Other Charges

From time to time, the Company takes actions to align its workforce, facilities and operating costs with perceived market opportunities, business strategies and changes in market and business conditions. The Company recognizes a liability for the cost associated with an exit or disposal activity in the period in which the liability is incurred, except for one-time employee termination benefits, which are measured at the communication date and recognized ratably over the required service period, if any.

(j) Recent Accounting Pronouncements

In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, which requires the Company to apply ASC 606, Revenue from Contracts with Customers, to recognize and measure contract assets and contract liabilities from contracts with customers acquired in a business combination. Before the update such balances were measured and recognized at fair value on the acquisition date. The ASU is effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. Early adoption is permitted, including in interim periods. The Company adopted these requirements prospectively, effective on the first day of the second quarter of year 2022. There was no material impact on our consolidated financial statements on the adoption date.

In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires the Company to measure and recognize expected credit losses for financial assets held and not accounted for at fair value through net income. In November 2018, April 2019 and May 2019, the FASB issued ASU No. 2018-19, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, and ASU No. 2019-05, Financial Instruments - Credit Losses (Topic 326): Targeted Transition Relief, which provided additional implementation guidance on the previously issued ASU. The Company adopted the updated guidance on January 1, 2022, utilizing the modified retrospective transition method and recorded a cumulative-effect adjustment of $0.4 million to accumulated deficit.

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(2) Business Combinations

ASSIA Acquisition

On May 27, 2022, the Company acquired certain assets and liabilities of Adaptive Spectrum and Signal Alignment, Incorporated (“ASSIA”), an industry pioneer of broadband access quality-of-experience and service assurance software solutions (the “ASSIA Acquisition”). The core assets acquired include the CloudCheck® Wi-Fi experience management and Expresse® access network optimization software solutions.

The initial purchase consideration was $25.0 million, including a $2.5 million holdback that will be released in 13 months following the transaction close date. In October 2022, the Company agreed to pay an additional $1.35 million of purchase consideration to settle certain unresolved matters related to the ASSIA Acquisition.

The acquisition was recorded as a business combination with valuation of the assets acquired and liabilities assumed recorded at their acquisition date fair value determined using primarily level three inputs, defined as unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company used a combination of income approach and market approach to determine the fair value of intangible assets acquired. Significant unobservable inputs included estimated future cash flows and a discount rate. Cash flow projections were based on management’s estimates of revenue growth rates and operating margins, EBITDA margins, consideration of industry and market conditions, terminal growth rates and management’s estimates of working capital requirements. The discount rate of 23% was based on a weighted average cost of capital adjusted for the relevant risk associated with the characteristics of intangible assets acquired. Under the market approach, the Company utilized an analysis of royalty rate licensing data. We completed the purchase price allocation for ASSIA Acquisition in the first quarter of 2023.

The following summarizes the final fair values of the assets acquired and liabilities assumed at the date of the ASSIA Acquisition (in thousands):


Allocation of purchase consideration
Cash and cash equivalents	$	203
Accounts receivable	2,322
Other assets	407
Right-of-use assets	2,172
Property, plant and equipment	232
Intangible assets	30,200
Accounts payable	(75)
Contract liabilities (As Restated)	(12,192)
Operating lease liabilities	(2,612)
Accrued and other liabilities	(756)
Goodwill (As Restated)	6,449
Total purchase consideration	$	26,350

The purchase price allocation resulted in the recognition of goodwill of approximately $6.4 million, which included the experienced workforce and the expected synergies from combining operations. The Company expects no goodwill to be deductible for tax purposes.

The following table represents the final estimated fair value and useful lives of identifiable intangible assets acquired (estimated fair value in thousands):


	Estimated fair value		Estimated useful life
Intangible assets acquired
Customer relationships	$	18,600	15 years
Customer backlog	5,100		10 years
Developed technology	6,200		5 - 7 years
Tradenames	300		10 years
Total intangible assets	$	30,200

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(3) Fair Value Measurement

The Company utilizes a fair value hierarchy that is intended to increase consistency and comparability in fair value measurements and related disclosures. The fair value hierarchy is based on inputs to valuation techniques that are used to measure fair value that are either observable or unobservable. Observable inputs reflect assumptions market participants would use in pricing an asset or liability based on market data obtained from independent sources while unobservable inputs reflect a reporting entity’s pricing based upon their own market assumptions. The fair value hierarchy consists of the following three levels:

Level 1 Inputs are quoted prices in active markets for identical assets or liabilities.

Level 2 Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.

Level 3 Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable

Assets and Liabilities Measured at Fair Value on a Recurring Basis:

The carrying values of financial instruments such as cash and cash equivalents, restricted cash, accounts and other receivables, accounts payable and accrued liabilities approximate their fair values based on their short-term nature. The Company classifies its cash and cash equivalents and restricted cash within Level 1 and other short-term assets and liabilities within Level 2. The carrying value of the Company's debt approximates its fair values based on the current rates available to the Company for debt of similar terms and maturities. The Company classifies its debt within Level 2.

The Company classifies its contingent liability from Optelian acquisition within Level 3 as it includes inputs not observable in the market. The Company estimates the fair value of contingent consideration as the present value of the expected contingent payments, determined using the revenue forecast for certain Optelian products through the end of 2023. The fair value of contingent liability is generally sensitive to changes in the revenue forecast during the payout period. The change in the respective fair value is included in selling, marketing, general and administrative expenses on the unaudited condensed consolidated statement of comprehensive loss.

The following table reconciles the beginning and ending balances of the Company’s Level 3 contingent liability (in thousands):


	Three Months Ended March 31,
	2023		2022
Balance at beginning of period	$	1,156	$	2,121

Net change in fair value	27		51
Balance at end of period	$	1,183	$	2,172

(4) Cash, Cash Equivalents and Restricted Cash

As of March 31, 2023 and December 31, 2022, the Company's cash, cash equivalents and restricted cash consisted of financial deposits. Cash, cash equivalents and restricted cash held within the U.S. totaled $16.8 million and $24.9 million as of March 31, 2023 and December 31, 2022, respectively. Cash, cash equivalents and restricted cash held within the U.S. are held at FDIC insured depository institutions. Cash, cash equivalents and restricted cash held outside the U.S. totaled $14.1 million and $13.6 million as of March 31, 2023 and December 31, 2022, respectively. Restricted cash consisted primarily of cash collateral for performance bonds and warranty bonds. Long-term restricted cash was $0.1 million and $0.2 million as of March 31, 2023 and December 31, 2022, respectively, and is included in other assets on the unaudited condensed consolidated balance sheets.

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(5) Balance Sheet Details

Balance sheet detail as of March 31, 2023 and December 31, 2022 is as follows (in thousands):

Inventories


	March 31, 2023
	(As Restated)		December 31, 2022
Raw materials	$	35,870	$	37,354
Work in process	1,465		1,050
Finished goods	59,976		55,884
Total inventories	$	97,311	$	94,288

Inventories are stated at the lower of cost or net realizable value, with cost being computed based on an adjusted standard basis, which approximates actual cost on an average or first-in, first-out basis. Finished goods include deferred cost of revenue of $26.3 million and $16.4 million as of March 31, 2023 and December 31, 2022, respectively.

Provision for inventory write-down was $1.1 million and $0.7 million for the three months ended March 31, 2023 and March 31, 2022, respectively.

Property, plant and equipment


	March 31, 2023		December 31, 2022

Machinery and equipment	$	12,971	$	17,214
Leasehold improvements	2,440		5,683
Computers and software	4,608		4,713
Furniture and fixtures	2,108		1,748
Construction in progress and other	1,358		1,264
	23,485		30,622
Less: accumulated depreciation and amortization	(16,285)		(21,062)
Less: government grants	(65)		(82)
Total property, plant and equipment, net	$	7,135	$	9,478

Depreciation expense associated with property, plant and equipment for the three months ended March 31, 2023 and March 31, 2022 was $1.2 million and $0.8 million, respectively.

Warranties

The Company accrues warranty costs based on historical trends for the expected material and labor costs to provide warranty services. The Company's standard warranty period is one year from the date of shipment with the ability for customers to purchase an extended warranty of up to five years from the date of shipment. The following table summarizes the activity related to the product warranty liability:


	Three Months Ended March 31,
	2023		2022
Balance at beginning of period	$	1,896	$	1,981
Charged to cost of revenue	70		121
Claims and settlements	(113)		(149)
Foreign currency exchange impact	21		(17)
Balance at end of period	$	1,874	$	1,936

Contract Balances

The Company records contract assets when it has a right to consideration and records accounts receivable when it has an unconditional right to consideration. Contract liabilities consist of cash payments received (or unconditional rights to receive cash) in advance of fulfilling performance obligations. The majority of the Company's performance obligations in its contracts with customers relate to contracts with duration of less than one year.

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The opening and closing balances of current and long-term contract assets and contract liabilities related to contracts with customers are as follows:


	Contract assets		Contract liabilities
December 31, 2022	$	576	$	26,493
March 31, 2023 (As Restated)	$	605	$	23,198

The decrease in contract liabilities during the three months ended March 31, 2023 was primarily due to the revenue recognition criteria being met for previously deferred revenue, partially offset by invoiced amounts that did not yet meet the revenue recognition criteria. The amount of revenue recognized in the three months ended March 31, 2023 that was included in the prior period contract liability balance was $8.5 million. The amount of revenue recognized in the three months ended March 31, 2022 that was included in the prior period contract liability balance was $2.4 million. This revenue consists of services provided to customers who had been invoiced prior to the current year. We expect to recognize approximately 72% of outstanding contract liabilities as revenue over the next 12 months and the remainder thereafter.

The balance of contract cost deferred as of March 31, 2023 and December 31, 2022 was $0.5 million and $1.0 million, respectively. During the three months ended March 31, 2023, the Company recorded $0.5 million in amortization related to contract cost deferred as of December 31, 2022. During the three months ended March 31, 2022, the Company recorded $0.2 million in amortization related to contract cost deferred as of December 31, 2021.

(6) Goodwill and Intangible Assets

The following table summarizes the activity related to goodwill (in thousands):


	March 31,
	2023
	(As Restated)		2022
Balance at beginning of period, gross	$	13,597	$	7,148
Accumulated impairment at beginning of period	(1,003)		(1,003)
Goodwill from acquisitions	—		—
Foreign currency exchange impact	—		—
Balance at end of period	$	12,594	$	6,145

Intangible assets consisted of the following (in thousands):


	March 31, 2023
	Gross Carrying Amount		Accumulated Amortization		Net
Customer relationships	$	24,331	$	(5,451)	$	18,880
Customer backlog	5,100		(723)		4,377
Developed technology	11,207		(4,822)		6,385
In-process research and development	890		(385)		505
Tradenames	300		(25)		275
Total intangible assets, net	$	41,828	$	(11,406)	$	30,422


	December 31, 2022
	Gross Carrying Amount		Accumulated Amortization		Net
Customer relationships	$	24,330	$	(4,759)	$	19,571
Customer backlog	5,100		(506)		4,594
Developed technology	11,207		(4,463)		6,744
In-process research and development	890		(340)		550
Tradenames	300		(17)		283
Total intangible assets, net	$	41,827	$	(10,085)	$	31,742

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Amortization expense associated with intangible assets for the three months ended March 31, 2023 and March 31, 2022 was $1.3 million and $0.3 million, respectively.

The following table presents the future amortization expense of the Company’s intangible assets as of March 31, 2023 (in thousands):


Remainder of 2023	$	3,962
2024	5,283
2025	5,278
2026	4,095
2027	3,143
Thereafter	8,661
Total	$	30,422

(7) Debt

The following table summarizes the Company’s debt (in thousands):


	March 31, 2023		December 31, 2022
JPMorgan Term Loan, long-term	$	—	$	—
JPMorgan Term Loan, current portion	24,063		24,375
Unamortized debt issuance costs	(403)		(302)
Long-term debt, including current portion	$	23,660	$	24,073
JPMorgan Revolving Credit Facility	$	12,000	$	4,000
Industrial Bank of Korea Loan	919		—
DNI Related Party Loan	3,827		5,706
Short-term debt and credit facilities	$	16,746	$	9,706
Total Debt	$	40,406	$	33,779

JPMorgan Credit Agreement

On February 9, 2022, the Company entered into a Credit Agreement (the “Credit Agreement”) by and between the Company, as borrower, certain subsidiaries of the Company, as guarantors, the lenders party thereto and JPMorgan Chase Bank, N.A., as administrative agent. The Credit Agreement originally provided for revolving loans (the "Revolving Credit Facility") in an aggregate principal amount of up to $30.0 million, up to $15.0 million of which is available for letters of credit, and was scheduled to mature on February 9, 2024. The maximum amount that the Company can borrow under the Credit Agreement is subject to a borrowing base, which is based on a percentage of eligible accounts receivable and eligible inventory, subject to reserves and other adjustments, plus $10.0 million.

On May 27, 2022, the Company entered into a First Amendment to Credit Agreement (the “Amendment”), which amends the Credit Agreement dated February 9, 2022 with the Company, as borrower, certain subsidiaries of the Company, as guarantors, the lenders party thereto and JPMorgan Chase Bank, N.A., as administrative agent.

The Amendment, among other things, (1) provides for a term loan (the “Term Loan”) in an aggregate principal amount of $25.0 million with a maturity date of May 27, 2027, (2) extends the maturity date of the $30.0 million Revolving Credit Facility to May 27, 2025, (3) permits the ASSIA Acquisition, (4) modifies the applicable margin for borrowings under the Credit Agreement to be, at the Company’s option, either (i) the adjusted term SOFR rate plus a margin ranging from 3.0% to 3.5% per year or (ii) the prime rate plus a margin ranging from 2.0% to 2.5% per year, in each case depending on the Company’s leverage ratio, (5) modifies the letter of credit fee such that it ranges from 3.0% to 3.5%, depending on the Company’s leverage ratio, (6) modifies the commitment fee on the unused portion of the Revolving Credit Facility to range from 0.25% to 0.35% per year, depending on the Company’s leverage ratio, (7) modifies the method of calculating the leverage ratio, and (8) modifies the financial covenants to (i) increase the maximum permitted leverage ratio to 3.00 to 1.00 through September 30, 2022, 2.50 to 1.00 thereafter through September 30, 2023, and 2.00 to 1.00 thereafter and (ii) replace the minimum liquidity requirement with a minimum permitted fixed charge coverage ratio of 1.25 to 1.00.

On May 27, 2022, the Company borrowed the full amount of the Term Loan to finance the ASSIA Acquisition.

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On February 15, 2023, the Company entered into a Second Amendment to Credit Agreement (the "Second Amendment"), which amends the Credit Agreement dated February 9, 2022 (as previously amended on May 27, 2022). The Second Amendment, among other things, (1) modifies the financial covenants to (i) suspend the maximum leverage ratio requirement of 2.50 to 1.00 until the fiscal quarter ending September 30, 2023 and (ii) suspend the minimum fixed charge coverage ratio requirement of 1.25 to 1.00 until the fiscal quarter ending December 31, 2023, (2) adds new financial covenants to require (i) minimum liquidity of $30.0 million for the fiscal quarter ending March 31, 2023, $35.0 million for the fiscal quarters ending June 30, 2023 and September 30, 2023, and $20.0 million at any time until September 30, 2023, and (ii) minimum EBITDA (as defined in the Credit Facility) of ($1 million) for the fiscal quarter ending March 31, 2023 and $1 for the fiscal quarter ending June 30, 2023, (3) increases the applicable margin for adjusted term SOFR borrowings and prime rate borrowings to 4.0% and 3.0%, respectively, when the Company’s leverage ratio exceeds 2.50 to 1.00, (4) increases the commitment fee on the unused portion of the revolving commitment to 0.40% per year when the Company’s leverage ratio exceeds 2.50 to 1.00, and (5) prohibits dividends and other distributions and tightens certain covenants.

On May 8, 2023, the Company entered into a Third Amendment to the Credit Agreement (the "Third Amendment"), which amends the Credit Agreement dated February 9, 2022 (as previously amended on May 27, 2022 and February 15, 2023). The Third Amendment, among other things, (1) modifies the financial covenants to eliminate the minimum EBITDA (as defined in the Credit Facility) of ($1 million) for the fiscal quarter ending March 31, 2023, (2) decreases the calculation of the borrowing base by $5 million through June 30, 2023 and an additional $5 million thereafter, (3) reduces the amount of the Revolving Credit Facility commitment to $25 million effective June 15, 2023, and (4) increases the applicable margin for adjusted term SOFR borrowings and prime rate borrowings to 4.5% and 3.5%, respectively, when the Company’s leverage ratio exceeds 2.50 to 1.00.

As of March 31, 2023, the Company's debt obligation under the Term Loan was $23.7 million, net of unamortized issuance cost of $0.4 million, and of which $1.3 million is scheduled for payment in the next 12 months. The Company had $12.0 million outstanding debt and $1.2 million in letters of credit issued under the $30.0 million Revolving Credit Facility as of March 31, 2023, and, after entering into the Third Amendment, $16.8 million was available to the Company for additional borrowing under the Revolving Credit Facility.

Due to the risk of non-compliance with certain financial covenants in the next 12 months, we presented our contractual long-term debt obligation of $22.8 million and $23.1 million as of March 31, 2023 and December 31, 2022, respectively, within the current portion of long-term debt on the unaudited condensed consolidated balance sheets. As of March 31, 2023, we were in discussion with the lenders to amend the debt agreement to mitigate the risk of non-compliance. Refer to Note 16 Subsequent events for further information about the amendment and subsequent termination of the JPMorgan Credit Agreement.

The future principal maturities of the Company's debt obligations for each of the next five years are as follows (in thousands):


Remainder of 2023	$	938
2024	1,563
2025	1,875
2026	2,188
2027	17,499
Total	$	24,063

Related Party Debt

On October 31, 2022, DNS Korea, the Company’s wholly-owned subsidiary, entered into a Loan Agreement with DNI (the “November 2022 DNI Loan”). The November 2022 DNI Loan was negotiated and approved on behalf of the Company and its subsidiaries by the audit committee of the Board of Directors of the Company which consists of directors determined to be independent from DNI. The November 2022 DNI Loan consisted of a term loan in the amount of KRW 7.2 billion ($5.0 million USD), with interest payable monthly at an annual rate of 6.0%.

In the first quarter of 2023, the entire outstanding balance on the November 2022 DNI Loan was repaid and DNS Korea entered into a new short-term loan arrangement with DNI (the “February 2023 DNI Loan”) and borrowed KRW 5.0 billion ($4.1 million USD), with interest payable monthly at an annual rate of 7.0%. The Company's debt obligation under the February 2023 DNI Loan was KRW 5.0 billion ($3.8 million USD) as of March 31, 2023. The entire outstanding balance on the February 2023 DNI Loan was repaid in the second quarter of 2023.

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As security for the February 2023 DNI Loan, DNS Korea granted a security interest to DNI in inventory of KRW 35.0 billion ($26.8 million USD) in its Janghowon warehouse, which should be maintained at a minimum of KRW 10.0 billion ($7.7 million USD), and account receivable for two certain customers in the amount to KRW 16.2 billion ($12.4 million USD).

Industrial Bank of Korea Loan

On March 30, 2023, DNS Korea entered into a Loan Agreement with Industrial Bank of Korea (the “IBK Loan”). The IBK Loan consisted of a short-term loan in the amount of KRW 1.2 billion ($0.9 million USD) with interest payable monthly at an annual rate of 6.3%. The entire outstanding balance on the IBK Loan was repaid in the second quarter of 2023.

(8) Employee Benefit Plans

Defined Contribution Plans

The Company maintains a 401(k) plan for its employees in the US whereby eligible employees may contribute up to a specified percentage of their earnings, on a pretax basis, subject to the maximum amount permitted by the Internal Revenue Code. Under the 401(k) plan, the Company made discretionary contributions to the plan in 2022. For the three months ended March 31, 2023, the Company recorded an expense of $0.3 million. For the three months ended March 31, 2022, the Company recorded an expense of $0.2 million.

The Company maintains a defined contribution plan for its employees in Korea. Under the defined contribution plan, the Company contributes the equivalent of 8.3% of an employee's gross salary into the plan. For each of the three months ended March 31, 2023 and March 31, 2022 the Company recorded an expense of $0.3 million.

Defined Benefit Plans

The Company sponsors defined benefit plans for its employees in Germany and Japan. Defined benefit plans provide pension benefits based on compensation and years of service. The Germany plans were frozen as of September 30, 2003 and have not been offered to new employees after that date. The Company has recorded the underfunded status as of March 31, 2023 and December 31, 2022 as a long-term liability on the unaudited condensed consolidated balance sheets. The accumulated benefit obligation for the plans in Germany and Japan was $11.1 million and $11.0 million as of March 31, 2023 and December 31, 2022, respectively. Periodic benefit costs for each of the three months ended March 31, 2023 and March 31, 2022 were $0.1 million.

The Company holds pension insurance contracts, with the Company as beneficiary, in the amount of $2.5 million as of March 31, 2023 and December 31, 2022 related to individuals under the pension plans. The Company records these insurance contracts based on their cash surrender value at the balance sheet dates. These insurance contracts are classified as other assets on the Company’s unaudited condensed consolidated balance sheet. The Company intends to use any proceeds from these policies to fund the pension plans. However, since the Company is the beneficiary on these policies, these assets have not been designated pension plan assets.

(9) Restructuring and Other Charges

In 2021, the Company made the strategic decision to relocate manufacturing functions of DZS GmbH and Optelian to Seminole, Florida and to transition the above subsidiaries to sales and research and development centers. For the three months ended March 31, 2022, the Company recorded $0.4 million of related restructuring costs. The restructuring of DZS GmbH and Optelian was completed in 2022 and no related restructuring costs were recorded for the three months ended March 31, 2023.

On September 17, 2022, DZS signed an agreement with Fabrinet, a third-party provider of electro-mechanical and electronic manufacturing and distribution services, to transition the sourcing, procurement, order-fulfillment, manufacturing and return merchandise authorization activities in the Company's Seminole, Florida facility to Fabrinet. The transition to Fabrinet began in October 2022 and substantially completed in the beginning of 2023. Post transition, the DZS Seminole, Florida-based operations, supply chain and manufacturing workforce will be reduced by approximately two-thirds and the remaining team is expected to be relocated to an appropriately sized facility. For the three months ended March 31, 2023, the Company recorded $3.5 million of restructuring related costs, consisting of freight and expedite fees of $1.0 million, facility and labor costs of $0.8 million, accelerated depreciation of manufacturing related assets of $0.4 million, termination-related benefits of $0.3 million, inventory write-off of $0.5 million, and other costs of $0.5 million. The Company accounted for the one-time employee termination benefits in accordance with ASC 420, Exit or Disposal Cost Obligations, and recognized the respective liability when the final terms of the benefit arrangement were

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communicated to the affected employees. As of March 31, 2023, the Company had $0.6 million liability related to termination benefits associated with Seminole restructuring.

For the three months ended March 31, 2023, the Company also included in restructuring and other charges approximately $0.3 million of facility costs related to impaired facilities and $0.4 million of non-capitalizable implementation costs related to replacement of the Company’s legacy enterprise resource planning and reporting software.

(10) Related Party Transactions

Related Party Debt

As of March 31, 2023, the Company had KRW 5.0 billion ($3.8 million USD) outstanding of the related party borrowing from DNI. See Note 7 Debt for additional information about the Company’s related party debt.

The following table sets forth payment guarantees of the Company's obligations as of March 31, 2023 that have been provided by Dasan Networks, Inc. ("DNI"). DNI owns approximately 29.2% of the outstanding shares of the Company's common stock. The amount guaranteed exceeds the principal amounts of outstanding obligations due to collateral requirements by the banks.


Guarantor	Amount Guaranteed (in thousands)		Description of Obligations Guaranteed
Dasan Networks, Inc.	$	4,422	Payment guarantee to Industrial Bank of Korea
Dasan Networks, Inc.	3,068		Payment guarantee to Shinhan Bank
	$	7,490

Other Related Party Transactions

Net revenue, cost of revenue, operating expense, interest expense, net and other expenses to and from related parties were as follows (in thousands) for the three months ended March 31, 2023 and 2022:


	Three Months Ended March 31, 2023
Counterparty	Net revenue		Cost of revenue		Operating expense		Interest expense, net		Other expenses
Dasan Networks, Inc.	$	153	$	128	$	294	$	79	$	16


	Three Months Ended March 31, 2022
Counterparty	Net revenue		Cost of revenue		Operating expense		Interest expense, net		Other expenses
Dasan Networks, Inc.	$	198	$	177	$	407	$	—	$	17

The Company has entered into sales agreements with DNI to sell certain services and finished goods produced by the Company. The Company also has an agreement with DNI in which DNI acts as a sales channel to third party customers. The above transactions are included in net revenue and cost of revenue on the unaudited condensed consolidated statement of comprehensive loss. Net revenue from DNI are recorded net of royalty fees for a sales channel arrangement.

DNS Korea has a lease agreement with DNI related to the lease of a warehouse facility. Operating lease cost related to the DNI lease totaled $0.1 million for the three months ended March 31, 2023. Operating lease cost related to the DNI leases totaled $0.2 million for the three months ended March 31, 2022. Operating lease expense is allocated between cost of revenue, research and product development, and selling, marketing, general and administrative expenses on the unaudited condensed consolidated statement of comprehensive loss. As of March 31, 2023, the right-of-use asset and operating lease liability related to DNI leases were $1.6 million. As of December 31, 2022, the right-of-use asset and operating lease liability related to DNI leases were $1.7 million.

The Company also pays a license fee under the Trademark License Agreement with DNI. The license fee is calculated as 0.4% of DNS Korea annual sales. For the three months ended March 31, 2023, license related expense were $0.2 million. For the three months ended March 31, 2022, license related expense were $0.1 million. License related expense are included in selling, marketing, general and administrative expenses on the consolidated statements of comprehensive loss.

Interest expense represents interest paid to DNI for the related party debt. Interest due to DNI was included in accrued and other liabilities on the unaudited condensed consolidated balance sheets as of March 31, 2022 and December 31, 2022. See Note 7 Debt for additional information about the Company’s related party debt.

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Other expenses represent charges from DNI for its payment guarantees relating to the Company's obligations. The Company pays DNI a guarantee fee which is calculated as 0.9% per annum of the guaranteed amount. Refer to the table above for further information about obligations guaranteed by DNI.

Balances of Receivables and Payables with Related Parties

Balances of receivables and payables arising from sales and purchases of goods and services with related parties as of March 31, 2023 and December 31, 2022 were included in the following balance sheet captions on the unaudited condensed consolidated balance sheets, as follows (in thousands):


	As of March 31, 2023
Counterparty	Account receivables		Other receivables		Loans Payable		Accounts payable		Accrued and other liabilities
Dasan Networks, Inc.	$	224	$	—	$	3,827	$	895	$	212


	As of December 31, 2022
Counterparty	Account receivables		Other receivables		Loans Payable		Accounts payable		Accrued and other liabilities
Dasan Networks, Inc.	$	943	$	123	$	5,706	$	1,019	$	483

(11) Net Loss Per Share

Basic net loss per share is computed by dividing the net loss for the period by the weighted average number of shares of common stock outstanding during the period. The calculation of diluted net loss per share gives effect to common stock equivalents; however, potential common stock equivalents are excluded if their effect is antidilutive. Potential common stock equivalents are composed of incremental shares of common stock issuable upon the exercise of stock options and the vesting of restricted stock units. In periods when a net loss is reported, all common stock equivalents are excluded from the calculation because they would have an anti-dilutive effect, meaning the loss per share would be reduced. Therefore, in periods when a loss is reported, basic and dilutive loss per share are the same.

The following table is a reconciliation of the numerator and denominator in the basic and diluted net loss per share calculation (in thousands, except per share data) for the three months ended March 31, 2023, and 2022:


	Three months ended March 31,
	2023
	(As Restated)		2022
Net loss	$	(23,817)	$	(7,586)
Weighted average number of shares outstanding:
Basic	31,045		27,530
Effect of dilutive securities:
Stock options, restricted stock units and share awards	—		—
Diluted	31,045		27,530
Net loss per share:
Basic	$	(0.77)	$	(0.28)
Diluted	$	(0.77)	$	(0.28)

The following table sets forth potential common stock that is not included in the diluted net loss per share calculation above because their effect would be anti-dilutive for the periods indicated (in thousands):


	Three months ended March 31,
	2023	2022
Outstanding stock options	563	939
Unvested restricted stock units	500	278

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(12) Leases

The Company leases certain properties and buildings (including manufacturing facilities, warehouses, and office spaces) and equipment under various arrangements which provide the right to use the underlying asset and require lease payments for the lease term. The Company’s lease portfolio consists of operating leases which expire at various dates through 2028.

Assets and liabilities related to operating leases are included in the consolidated balance sheets as right-of-use assets from operating leases, operating lease liabilities - current and operating lease liabilities - non-current. The Company recognizes minimum rental expense on a straight-line basis based on the fixed components of a lease arrangement. The Company amortizes this expense over the term of the lease beginning with the date of initial possession, which is the date the lessor makes an underlying asset available for use. For the three months ended March 31, 2023, the Company recognized lease expense of $1.0 million. For the three months ended March 31, 2022, the Company recognized lease expense of $1.2 million.

The following table presents the Company's future contractual rent obligations as of March 31, 2023 (in thousands):


Remainder of 2023	$	4,209
2024	5,131
2025	3,575
2026	2,232
2027	1,121
Thereafter	693
Total operating lease payments	16,961
Less: imputed interest	(1,603)
Total operating lease liabilities	$	15,358

(13) Commitments and Contingencies

Performance Guarantees

In the normal course of operations, from time to time, the Company arranges for the issuance of various types of performance guarantees, such as standby letters of credit or surety bonds. These instruments are arrangements under which the financial institution or surety provides a financial guarantee that the Company will perform in accordance with contractual or legal obligations. As of March 31, 2023, the Company had $15.6 million of performance guarantees in the form of bank guarantees or surety bonds guaranteed by third parties.

Trade Compliance Matter

During the first quarter of 2022, the Company received a notice letter from the Office of the Commissioner of Customs, Chennai II of the India Department of Revenue (the “Notice”) claiming the Company had allegedly mis-declared and incorrectly classified certain products imported to India by the Company at the time of clearance of customs. The Notice claims that due to such mis-declaration and incorrect classification of the imported products, the Company and its contract manufacturer in India underpaid duties approximating INR 299.6 million ($3.6 million USD based on exchange rates as of March 31, 2023) related to such products. The documents relied upon in the Notice were requested by the Company, however they are yet to be received. In the second quarter of 2023, the Company received a second notice letter issued by the Office of the Principal Commissioner of Customs (Air Cargo) Complex, Chennai VII Commissionerate claiming the alleged underpaid duties approximated INR 389.3 million ($4.7 million based on exchange rates as of March 31, 2023). The two notice letters cover substantially the same shipments and overlap in scope. The Company intends to vigorously defend itself in this matter. As we have not yet received the full contents of the Notice, we are unable to estimate a potential loss related to this matter, if any, which could range up to the full amount of the alleged unpaid duties, plus penalties and interest.

Plume

On October 10, 2022, Plume Design, Inc. (“Plume”) filed suit against DZS in the Superior Court of the State of Delaware, alleging that DZS breached a reseller contract with Plume and seeking $24.75 million in damages. The parties have completed briefing on dispositive motions, and a trial is currently set for October 7, 2024. DZS intends to vigorously defend this lawsuit.

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In addition to the matters discussed above, from time to time, the Company is subject to various legal proceedings, claims and litigation arising in the ordinary course of business. While the outcome of these matters is currently not determinable, the Company records an accrual for legal contingencies that it has determined to be probable to the extent that the amount of the loss can be reasonably estimated. The Company does not expect that the ultimate costs to resolve these matters will have a material adverse effect on its consolidated financial position, results of operations or cash flows. However, litigation is subject to inherent uncertainties, and unfavorable rulings could occur. If an unfavorable ruling were to occur, there exists the possibility of a material adverse impact on the results of operations and cash flows of the reporting period in which the ruling occurs, or future periods.

(14) Income Taxes

Income tax provision for the three months ended March 31, 2023 was approximately $1.2 million on pre-tax loss of $22.6 million. Income tax provision for the three months ended March 31, 2022 was approximately $1.8 million on pre-tax loss of $5.8 million.

As of March 31, 2023, the income tax rate varied from the United States statutory income tax rate primarily due to valuation allowances in North America, EMEA and Asia, mandatory R&D expense capitalization in the U.S., and foreign and state income tax rate differentials. Consistent with the prior periods, the Company continued to maintain valuation allowances in North America, EMEA and Asia.

The total amount of unrecognized tax benefits, including interest and penalties, as of March 31, 2023 was $5.2 million. There were no significant changes to unrecognized tax benefits during the three months ended March 31, 2023. The Company does not anticipate any significant changes with respect to unrecognized tax benefits within the next twelve months.

(15) Enterprise-Wide Information

The Company is a global provider of ultra-broadband network access solutions and communications platforms deployed by advanced Tier 1, national and regional service providers and enterprise customers. There are no segment managers who are held accountable for operations, operating results and plans for levels or components below the Company unit level. Accordingly, the Company is considered to be in a single operating segment. The Company’s chief operating decision maker is the Company’s Chief Executive Officer, who reviews financial information presented on a consolidated basis accompanied with disaggregated revenues by geographic region for purposes of making operating decisions and assessing financial performance.

The Company attributes revenue from customers to individual countries based on location shipped. Refer to Note 1(f) Disaggregation of Revenue for the required disclosures on geographical concentrations and revenues by source.

The Company's property, plant and equipment, net of accumulated depreciation, were located in the following geographical areas (in thousands) as of March 31, 2023 and December 31, 2022:


	March 31, 2023		December 31, 2022
United States	$	3,870	$	5,725
Korea	2,440		2,706
Japan	619		644
Canada	—		157
Germany	88		110
Other	118		136
	$	7,135	$	9,478

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

As used in this Quarterly Report on Form 10-Q/A, unless the context suggests otherwise, the terms “DZS,” the “Company” “we,” “our” and “us” refer to DZS Inc. and its subsidiaries.

Forward-Looking Statements

This Quarterly Report on Form 10-Q/A, including “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” contains forward-looking statements regarding future events and our future results that are subject to the safe harbors created under the Securities Act of 1933 (the “Securities Act”) and the Securities Exchange Act of 1934 (the “Exchange Act”). These statements are based on current expectations, estimates, forecasts, and projections about the industries in which we operate, and reflect the beliefs and assumptions of our management as of the date hereof.

We use words such as “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “forecast,” “goal,” “intend,” “may,” “plan,” “project,” “seek,” “should,” “target,” “will,” “would,” variations of such words, and similar expressions to identify forward-looking statements. In addition, statements that refer to projections of earnings, revenue, costs or other financial items in future periods; anticipated growth and trends in our business, industry or key markets; cost synergies, growth opportunities and other potential financial and operating benefits of our acquisitions; future growth and revenues from our products; our plans and our ability to refinance or repay our existing indebtedness prior to the applicable maturity dates; our ability to access capital to fund our future operations; future economic conditions and performance; the impact of the global outbreak of COVID-19, also known as the coronavirus; the impact of inflation, interest rate and foreign currency fluctuations; anticipated performance of products or services; competition; plans, objectives and strategies for future operations, including our pursuit or strategic acquisitions and our continued investment in research and development; other characterizations of future events or circumstances; and all other statements that are not statements of historical fact, are forward-looking statements within the meaning of the Securities Act and the Exchange Act. Although we believe that the assumptions underlying the forward-looking statements are reasonable, we can give no assurance that our expectations will be attained. Readers are cautioned not to place undue reliance on such forward-looking statements, which are being made as of the date of this Quarterly Report on Form 10-Q/A. Except as required by law, we undertake no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise.

Factors which could have a material adverse effect on our operations and future prospects or which could cause actual results to differ materially from our expectations include factors discussed in Part I, Item 1A “Risk Factors” of our Annual Report on Form 10-K/A, as well as factors described from time to time in our future reports filed with the U.S. Securities and Exchange Commission (the “SEC”).

OVERVIEW

We are a global provider of access and optical networking infrastructure and cloud software solutions that enable the emerging hyper-connected, hyper-broadband world and broadband experiences. The Company provides a wide array of reliable, cost-effective networking technologies and software to a diverse customer base.

We research, develop, test, sell, manufacture and support platforms in the areas of mobile transport and fixed broadband access, as discussed below. We have extensive regional development and support centers around the world to support our customer needs.

Our solutions and platforms portfolio include products in Access Edge, Subscriber Edge, Optical Edge, and Cloud Software.

•Access Edge. Our DZS Velocity portfolio offers a variety of solutions for carriers and service providers to connect residential and business customers, either using high-speed fiber or leveraging their existing deployed copper networks to offer broadband services to customer premises. Once our broadband access products are deployed, the service provider can offer voice, high-definition and ultra-high-definition video, high speed internet access and business class services to their customers. In addition, the switching and routing products we provide in this space offer a high-performance and manageable solution that bridges the gap from carrier access technologies to the core network. XCelerate by DZS increases the velocity with which service providers can leap to multi-gigabit services at scale by enabling rapid transition from Gigabit Ethernet Passive Optical Network (“GPON”) to 10 Gigabit Symmetrical Passive Optical Network (“XGS-PON”) and Gigabit Ethernet to 10 Gigabit Ethernet via any service port across a range of existing DZS Velocity chassis and 10 gigabit optimized stackable fixed form factor units.

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•Subscriber Edge. Our DZS Helix connected premises product portfolio offers a large collection of optical network terminals (“ONTs”) and smart gateway solutions for any fiber to the “x” (“FTTx”) deployment. DZS ONTs and Smart Gateway platforms are designed for high bandwidth services being deployed to the home or business. Our connected premises portfolio consists of indoor/outdoor ONTs and gateways delivering best-in-class data and WiFi throughout the premises to support FTTx applications. The product feature set gives service providers an elegant migration path from legacy to soft switch architectures without replacing ONTs.

•Optical Edge. Our DZS Chronos and DZS Saber portfolios provide robust, manageable and scalable solution for mobile operators and service providers that enable them to upgrade their mobile fronthaul/midhaul/backhaul (“xHaul”) systems and migrate to fifth generation wireless technologies (“5G”) and beyond as well as deliver robust edge transport. DZS Chronos provides a full range of 5G-ready xHaul and coherent optical capable solutions that are open, software-defined, and field proven. Our mobile xHaul and edge transport products may be collocated at the radio access node base station and can aggregate multiple radio access node base stations into a single backhaul for delivery of mobile traffic to the radio access node network controller or be leveraged as transport vehicles for FTTx deployments. Our products support pure Ethernet switching as well as layer 3 IP and Multiprotocol Label Switching (“MPLS”), and we interoperate with other vendors in these networks. Our DZS Saber portfolio provides high bandwidth optical transport and services, enabling service providers to push high bandwidth transport closer to their subscribers near the edge of their networks. Complementary to the growth of high bandwidth technologies like XGS-PON and 5G mobile at the access edge, DZS Saber products leverage environmentally hardened dense wavelength-division multiplexing (DWDM) coherent optics to deliver transport bandwidth speeds from 100 gigabits per second (Gbps) to 400 Gbps over long distances that can be necessary to support advanced access and mobile technologies. Some DZS Saber platforms also provide additional feature such as multi-degree colorless directionless contentionless (CDC) FlexGrid reconfigurable optical add-drop multiplexer (ROADM) functionality, which allows service providers to easily adjust to changing network traffic demands.

•Cloud Software. Our DZS Cloud platform provides software capabilities specifically in the areas of network orchestration, application slicing, automation, analytics, service assurance, and consumer broadband experience. Via our DZS Xtreme solutions we offer a commercial, carrier-grade network-slicing enabled orchestration platform complementing our position with physical network devices supporting Open RAN (“O-RAN”) and 4G/5G networks. Communications service providers are implementing software defined networking (“SDN”) and network functions virtualization (“NFV”) architectures to reduce reliance on proprietary systems and hardware, which increase service agility, flexibility, and deployment of new network services while lowering costs. Our Expresse software solution provides a clear view of multi-vendor, multi-technology access networks for both network and service assurance while monitoring, identifying, diagnosing, and fixing network problems via an artificial intelligence (AI) based recommendation engine. CloudCheck software is an advanced WiFi experience management and analytics solution that enables communications service providers to monitor, manage and optimize home WiFi networks. DZS customers are implementing experience and service assurance solutions to reduce support costs, including specifically the costs of WiFi troubleshooting and truck rolls, improve service performance and customer satisfaction, and ultimately reduce subscriber churn and increase average revenue per user (ARPU).

Our key financial objectives include the following:

•Increasing revenue while continuing to carefully control costs;

•Continuing investments in strategic research and product development activities that will provide the maximum potential return on investment;

•Minimizing consumption of our cash and cash equivalents; and

•Improving gross margin through a wide range of initiatives, including an increase in the mix of recurring software revenue and reducing fixed costs by outsourcing manufacturing.

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RECENT DEVELOPMENTS

On February 15, 2023, the Company entered into a Second Amendment to Credit Agreement (the “Second Amendment”), which amends the Credit Agreement dated February 9, 2022 (as previously amended on May 27, 2022) and, among other things, modifies certain financial covenants. Refer to Note 7, in the Notes to Unaudited Condensed Consolidated Financial Statements, for further information on the Second Amendment.

As of March 31, 2023, the Company's debt obligation under the Term Loan was $23.7 million, net of unamortized issuance cost of $0.4 million, and of which $1.3 million is scheduled for payment in the next 12 months. Due to the risk of non-compliance with certain financial covenants in the next 12 months, we presented our contractual long-term debt obligation of $22.8 million and $23.1 million as of March 31, 2023 and December 31, 2022, respectively, within the current portion of long-term debt on the unaudited condensed consolidated balance sheets. As of March 31, 2023, we were in discussion with the lenders to amend the debt agreement to mitigate the risk of non-compliance. Refer to Note 16 Subsequent events in the Notes to Unaudited Condensed Consolidated Financial Statements for further information about the amendment and subsequent termination of the JPMorgan Credit Agreement.

RESTATEMENT

The accompanying Management’s Discussion and Analysis of Financial Condition and Results of Operations gives effect to the restatement adjustments made to the previously reported unaudited condensed consolidated financial statements for the three months ended March 31, 2023 and March 31, 2022. Restatement adjustments have also been made to the previously reported consolidated balance sheet as of December 31, 2022. For additional information and a detailed discussion of the restatement, see Note 1 (e) Restatement in the Notes to Unaudited Condensed Consolidated Financial Statements.

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RESULTS OF OPERATIONS

The table below presents the historical consolidated statement of comprehensive loss as a percentage of revenues and year-over-year changes (dollars in thousands).


	Three months ended March 31,
	2023		% of net revenue		0		% of net revenue		Increase (Decrease)
	(As Restated)		(As Restated)		(As Restated)		(As Restated)		(As Restated)
Net revenue	$	69,812	100	%	$	71,990	100	%	(3.0)	%
Cost of revenue	47,318		68	%	46,599		65	%	1.5	%
Gross profit	22,494		32	%	25,391		35	%	(11.4)	%
Operating expenses:
Research and product development	14,851		21	%	11,844		16	%	25.4	%
Selling, marketing, general and administrative	24,781		35	%	17,742		25	%	39.7	%
Restructuring and other charges	4,152		6	%	436		1	%	852.3	%
Amortization of intangible assets	1,271		2	%	294		1	%	332.3	%
Total operating expenses	45,055		64	%	30,316		43	%	48.6	%
Operating loss	(22,561)		(32)	%	(4,925)		(8)	%	358.1	%
Interest expense, net	(792)		(1)	%	(90)		—	%	780.0	%
Other income (expense), net	728		1	%	(800)		(1)	%	(191.0)	%
Loss before income taxes	(22,625)		(32)	%	(5,815)		(9)	%	289.1	%
Income tax provision	1,192		2	%	1,771		2	%	(32.7)	%
Net loss	$	(23,817)	(34)	%	$	(7,586)	(11)	%	214.0	%

Net Revenue

The following table presents our revenues by product technology (dollars in thousands):


	Three Months Ended March 31,
	2023		2022		Increase (Decrease)
	(As Restated)		(As Restated)		(As Restated)
Access Networking Infrastructure	$	58,496	$	67,412	(13.2)	%
Cloud Software & Services	11,316		4,578		147.2	%
Total	$	69,812	$	71,990	(3.0)	%

Our revenue from sales of access networking infrastructure products includes Access Edge, Optical Edge, and Subscriber Edge network solutions. Our cloud software and services revenue represents revenue from our Cloud Software solutions including DZS Xtreme, Expresse and CloudCheck software, and revenue from maintenance and other professional services associated with product shipments.

For the three months ended March 31, 2023, access networking infrastructure revenue decreased by 13.2% or $8.9 million to $58.5 million from $67.4 million in the same period last year. The decrease was primarily attributable to lower spending levels from our major customers in Asia. The increase in cloud software and services revenue was primarily due to the revenue related to the ASSIA Acquisition.

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The following table presents our revenues by geographical concentration (dollars in thousands):


	Three Months Ended March 31,
	2023		2022		Increase (Decrease)
	(As Restated)		(As Restated)		(As Restated)
Americas	$	24,975	$	22,924	8.9	%
Europe, Middle East, Africa	18,406		16,393		12.3	%
Asia	26,431		32,673		(19.1)	%
Total	$	69,812	$	71,990	(3.0)	%

Our geographic diversification reflects the combination of market demand, a strategic focus on capturing market share through new customer wins and new product introductions.

The decrease in net revenue for the three months ended March 31, 2023 was attributable to decreased revenue in Asia driven by decreased spending levels from our major customers in the region, partially offset by the revenue related to the ASSIA Acquisition.

We anticipate that our results of operations in any given period may depend to a significant extent on sales to a small number of large customers. As a result, our revenue for any quarter may be subject to significant volatility based upon changes in orders from one or a small number of key customers.

Cost of Revenue and Gross Profit

Total cost of revenue increased by 1.5% to $47.3 million for the three months ended March 31, 2023, compared to $46.6 million for the three months ended March 31, 2022. Total cost of revenue was 67.8% of net revenue for the three months ended March 31, 2023, compared to 64.7% of net revenue for the three months ended March 31, 2022, which resulted in a decrease in gross profit percentage to 32.2% for the three months ended March 31, 2023 from 35.3% for the three months ended March 31, 2022. The decrease in total cost of revenue was primarily due to the decrease in sales volume. The gross profit percentage decrease was primarily due to the change in number and mix of products sold, as certain lower margin projects anticipated in later quarters were accelerated into the first quarter, and certain higher margin projects were deferred to later quarters, which was partially offset by higher margins on software sales related to the ASSIA Acquisition.

Operating Expenses

Research and Product Development Expenses: Research and product development expenses include personnel costs, outside contractor and consulting services, depreciation on lab equipment, costs of prototypes and overhead allocations.

Research and product development expenses increased by 25.4% to $14.9 million for the three months ended March 31, 2023 compared to $11.8 million for the three months ended March 31, 2022. The increase in research and product development expenses was primarily due to strategic hiring decisions in research, development, and product line management with the intent to accelerate growth and capture market share and the ASSIA Acquisition.

We intend to continue to invest in research and product development to attain our strategic product development objectives, while seeking to manage the associated costs through expense controls.

Selling, Marketing, General and Administrative Expenses: Selling, marketing, general and administrative expenses include personnel costs for sales, marketing, administration, finance, information technology, human resources and general management as well as legal and accounting expenses, rent, utilities, trade show expenses and related travel costs.

Selling, marketing, general and administrative expenses increased by 39.7% to $24.8 million for the three months ended March 31, 2023 compared to $17.7 million for the three months ended March 31, 2022. The increase was primarily due to higher stock-based compensation and strategic hiring decisions across sales and administration with the intent to accelerate growth and capture market share.

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Restructuring and Other Charges: Restructuring and other charges for the three months ended March 31, 2023 primarily related to the strategic decision to outsource manufacturing from the Company's Seminole, Florida facility to Fabrinet, for which the Company recorded $3.5 million of such charges. The Company also included in restructuring and other charges approximately $0.3 million of facility costs related to impaired facilities and $0.4 million of non-capitalizable implementation costs related to replacement of the Company’s legacy enterprise resource planning and reporting software. Restructuring and other charges for the three months ended March 31, 2022 related primarily to the transition DZS GmbH and Optelian to sales and research and development centers, for which the Company recorded $0.4 million of such charges. See Note 9 Restructuring and Other Charges of the Notes to Unaudited Condensed Consolidated Financial Statements, for further information.

Interest Income (Expense), net: Interest income (expense) relates mainly to earnings from our cash and cash equivalents, interest expense associated with the credit facilities and amortization of debt issuance costs associated with obtaining such credit facilities. For the three months ended March 31, 2023, the Company recorded $0.8 million interest expense, net. For the three months ended March 31, 2022, the Company recorded $0.1 million of interest expense, net.

Other Income (Expense), net: Other income (expense), net relates mainly to realized and unrealized foreign exchange gains and losses. For the three months ended March 31, 2023, the Company recorded $0.7 million of other income, net. For the three and nine months ended March 31, 2022, the Company recorded $0.8 million of other expense. The change in other income (expense), net was primarily due to foreign currency exchange rates fluctuation during the above periods.

Income Tax Provision: Income tax provision for the three months ended March 31, 2023 was approximately $1.2 million on pre-tax loss of $22.6 million. Income tax provision for the three months ended March 31, 2022 was approximately $1.8 million on pre-tax loss of $5.8 million.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

For a complete description of what we believe to be the critical accounting policies and estimates used in the preparation of our unaudited condensed consolidated financial statements, refer to Note 1 Organization and Summary of Significant Accounting Policies in the Notes to our Audited Consolidated Financial Statements in our Annual Report on Form 10-K/A for the year ended December 31, 2022, as supplemented by Note 1 Organization and Summary of Significant Accounting Policies of the Notes to Unaudited Condensed Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q/A.

LIQUIDITY AND CAPITAL RESOURCES

Our operations are financed through a combination of our existing cash, cash equivalents, available credit facilities, and issuance of equity or debt instruments, based on our operating requirements and market conditions.

The following table summarizes the information regarding our cash and cash equivalents and working capital (in thousands):


	March 31, 2023		December 31, 2022
Unrestricted cash and cash equivalents	$	28,892	$	34,347
Working capital (As Restated)	$	68,806	$	89,658

As of March 31, 2023, we had $68.8 million of working capital and $28.9 million in unrestricted cash and cash equivalents, which included $13.3 million in cash balances held by our international subsidiaries.

As of March 31, 2023, the Company's debt obligation under the Term Loan was $23.7 million, net of unamortized issuance cost of $0.4 million, and of which $1.3 million is scheduled for payment in the next 12 months. As of March 31, 2023, we had $12 million outstanding debt and $1.2 million in letters of credit issued under the $30.0 million Revolving Credit Facility, and, after entering into the Third Amendment, $16.8 million was available to the Company for additional borrowing under the Revolving Credit Facility.

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Due to the risk of non-compliance with certain financial covenants in the next 12 months, we presented our contractual long-term debt obligation of $22.8 million and $23.1 million as of March 31, 2023 and December 31, 2022, respectively, within the current portion of long-term debt on the unaudited condensed consolidated balance sheets. As of March 31, 2023, we were in discussion with the lenders to amend the debt agreement to mitigate the risk of non-compliance. Refer to Note 16 Subsequent events in the Notes to Unaudited Condensed Consolidated Financial Statements for further information about the amendment and subsequent termination of the JPMorgan Credit Agreement.

In addition to negotiating for revised financial covenants, we continue to focus on cost management, operating efficiency and efficient discretionary spending. Management is actively taking measures to enhance profitability and liquidity, including reducing the Company’s cost structure and cash outflows, including its investment in inventory, and managing receivable balances through aggressive collection efforts and tighter customers payment terms. These plans are not completely within the Company’s control, as some actions are dependent on the Company’s lenders, vendors and customers. However, management believes that such plans are reasonably achievable and the Company will sufficiently meet its liquidity needs.

In addition, if necessary, we may leverage our Revolving Credit Facility or issue debt or equity securities. We may also rationalize the number of products we sell, adjust our manufacturing footprint, and reduce our operations in low margin regions, including reductions in headcount. Based on our current forecast, plans and current business conditions, the Company believes its existing cash, together with the working capital balances, will be sufficient to fund the Company’s ongoing liquidity requirements, including debt repayments, operating expenses and capital expenditures for at least the next 12 months from the date of this Quarterly Report on Form 10-Q/A.

The following table presents a summary of our cash flow activity for the periods set forth below (in thousands):


	Three months ended March 31,
	2023		2022
	(As Restated)		(As Restated)
Consolidated Statements of Cash Flows Data
Net cash used in operating activities	$	(15,169)	$	(10,732)
Net cash provided by (used in) investing activities	1,015		(1,317)
Net cash provided by (used in) financing activities	6,610		(22)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	96		(903)
Net change in cash, cash equivalents and restricted cash	$	(7,448)	$	(12,974)
Cash, cash equivalents and restricted cash at beginning of period	$	38,464	$	53,639
Cash, cash equivalents and restricted cash at end of period	$	31,016	$	40,665

Operating Activities

Net cash used in operating activities increased by $4.4 million to $15.2 million for the three months ended March 31, 2023 from net cash used in operating activities of $10.7 million for the three months ended March 31, 2022. The increase in cash used in operating activities was primarily due to an increase in research and development expenses, sales and marketing expense, and restructuring expenses related to the Fabrinet transition.

Investing Activities

Net cash provided by investing activities totaled $1.0 million for the three months ended March 31, 2023 and consisted primarily of cash received from the sale of manufacturing equipment as part of transition to Fabrinet. This is in comparison to net cash used in investing activities of $1.3 million for the three months ended March 31, 2022 which consisted primarily of purchases of property and equipment.

Financing Activities

Net cash provided by financing activities totaled $6.6 million for the three months ended March 31, 2023 and consisted primarily of net drawings on Revolving Credit Facility and other short-term borrowings. This is in comparison to net cash used in financing activities of $0.1 million for the three months ended March 31, 2022 which consisted primarily of payment of debt issuance cost partially offset by proceeds from exercise of stock awards.

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Cash Management

Our primary source of liquidity comes from our cash, cash equivalents and restricted cash, which totaled $31.0 million at March 31, 2023. Our cash, cash equivalents and restricted cash as of March 31, 2023 included $14.1 million held by our international subsidiaries.

Debt Facilities

As of March 31, 2023, the Company's debt obligation consisted of $23.7 million of the JPMorgan Term Loan obligation, $12.0 million outstanding debt under the $30.0 million Revolving Credit Facility, $0.9 million of the short-term obligation under the IBK Loan, and $3.8 million of short-term obligation under the February 2023 DNI Loan. Refer to Note 7 Debt, in the Notes to Unaudited Condensed Consolidated Financial Statements, for more detail about our current and past debt obligations.

Future Cash Requirements and Funding Sources

Our fixed commitments for cash expenditures consist primarily of payments under operating leases, inventory purchase commitments, and payments of principal and interest for debt obligations.

From time to time, we may provide or commit to extend credit or credit support to our customers. This financing may include extending the terms for product payments to customers. Any extension of financing to our customers will limit the capital that we have available for other uses.

Our accounts receivable represent a concentration of credit risk because a significant portion of the accounts receivable balance at any point in time typically consists of a relatively small number of customer account balances. As of March 31, 2023, no customers represented more than 10% of net accounts receivable. Net accounts receivables from customers in countries other than the United States represented 81% of such receivables. We do not currently have any material commitments for capital expenditures, or any other material commitments aside from operating leases for our facilities, inventory purchase commitments and debt obligations.

The Tax Cuts and Jobs Act of 2017 (TCJA) requires capitalization of all research and development ("R&D") costs incurred in tax years beginning after Dec. 31, 2021 for tax reporting purposes. Capitalized R&D costs will be deductible over five years if the R&D activities are performed in the U.S. or 15 years if the activities are performed outside of the U.S. Due to the Company's significant annual investment in R&D, the impact of this legislation will accelerate the utilization of the Company's net operating loss carryforwards and the timing of when the Company becomes a tax paying entity in the U.S.

Operating Leases

Future minimum operating lease obligations include primarily payments for our office locations and manufacturing, research and development locations, which expire at various dates through 2028. See Note 12 Leases of the Notes to Unaudited Condensed Consolidated Financial Statements for further information regarding our operating leases.

Purchase Commitments

We may have short-term purchase commitments related to the purchase orders for products and services, within the normal course of business. In certain instances, we are permitted to cancel, reschedule or adjust these orders.

Debt obligations

Future debt obligations include scheduled principal repayments, and associated interest payments which may vary based on changes in market interest rates. See Note 7 Debt to Unaudited Condensed Consolidated Financial Statements for further information regarding our debt obligations.

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Item 3. Quantitative and Qualitative Disclosures about Market Risk

Market risk represents the risk of loss that may impact our financial position due to adverse changes in financial market prices and rates. Our market risk exposure is primarily a result of fluctuations in interest rates and foreign currency exchange risks. We do not hold or issue financial instruments for trading purposes.

Interest Rate Risk

We had unrestricted cash and cash equivalents of $28.9 million and $34.3 million at March 31, 2023 and December 31, 2022, respectively. We do not have material exposure to market risk with respect to investments, as our investments consist primarily of highly liquid investments purchased with original maturities of three months or less.

Our exposure to interest rate risk includes the amount of interest we must pay on our borrowings under our JPMorgan Credit Agreement. At the Company’s option, amounts borrowed under the Credit Agreement, as amended, accrue interest at a per annum rate equal to either (i) the adjusted term SOFR rate plus a margin ranging from 3.5% to 4.5% per year or (ii) the prime rate plus a margin ranging from 2.5% to 3.5% per year, in each case depending on the Company’s leverage ratio.

As of March 31, 2023, the Company's contractual debt obligation under the Term Loan was $24.1 million. If the applicable variable interest rates changed by 200 basis points, our interest expense for the first three months of 2023 would have decreased or increased by less than $0.2 million.

Foreign Currency Exchange Risk

We have foreign currency risks related to certain of our foreign subsidiaries, primarily in Korea, Japan, Germany, and the UK. International net revenues and operating expense are typically denominated in the local currency of each country and result from transactions by our operations in these countries. The local currencies of these foreign subsidiaries are the South Korean Won ("KRW"), Japanese Yen ("JPY"), Euro ("EUR), and Pound Sterling ("GBP"), respectively. Fluctuations in foreign currencies create volatility in our reported results of operations. If the U.S. Dollar ("USD") had appreciated or depreciated by 10% relative to KRW, JPY, EUR and GBP our operating income for the first three months of 2023 would have decreased or increased by approximately $3.0 million, respectively.

Foreign exchange rate fluctuations may also adversely impact our financial position as the assets and liabilities of our foreign operations are translated into USD in preparing our unaudited condensed consolidated balance sheets. The effect of foreign exchange rate fluctuations on our consolidated financial position for the three months ended March 31, 2023 was a net translation loss of $1.9 million. This loss is recognized as an adjustment to stockholders’ equity through accumulated other comprehensive loss. If USD had appreciated or depreciated by 10% relative to KRW, JPY, EUR, and GBP, our net assets as of March 31, 2023 would have decreased or increased by approximately $3.0 million, respectively.

We have certain assets and liabilities, primarily inter-company loans, that are denominated in currencies other than the relevant entity’s functional currency. Our intercompany loans are primarily denominated in USD and EUR. Changes in the functional currency value of these balances create fluctuations in our reported consolidated financial position, cash flows and results of operations. Transaction gains and losses on these foreign currency denominated assets and liabilities are recognized each period within “Other income (expense), net” in our unaudited condensed consolidated statement of comprehensive loss. During the three months ended March 31, 2023, we recognized approximately $0.3 million of gain related to the intercompany loans denominated in foreign currencies. If USD had appreciated or depreciated by 10% relative to EUR, our net income for the first three months of 2023 would have decreased or increased by approximately $2.0 million, respectively.

Item 4. Controls and Procedures

Disclosure Controls and Procedures

We are required to maintain disclosure controls and procedures designed to provide reasonable assurance of achieving the objective that information required to be disclosed in our reports filed or submitted pursuant to the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and that such information is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow for timely decisions regarding required disclosures. Our disclosure controls and procedures include those components of our internal control over financial reporting intended to provide reasonable assurance that transactions are recorded as necessary to permit preparation of financials in accordance with U.S. GAAP. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

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As required by Rule 13a-15(b) under the Exchange Act, we conducted an evaluation of the effectiveness of our disclosure controls and procedures as of March 31, 2023, the end of the period covered by this Quarterly Report on Form 10-Q/A. The evaluation was done under the supervision and with the participation of management, including our principal executive officer and principal financial officer. In the course of the evaluation of our disclosure controls and procedures, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures were not effective as of March 31, 2023, due to the existence of unremediated material weaknesses in internal control over financial reporting described below.

A material weakness (as defined in Rule 12b-2 under the Exchange Act) is a deficiency, or combination of deficiencies, in internal control over financial reporting such that there is a reasonable possibility that a material misstatement in our annual or interim financial statements will not be prevented or detected on a timely basis.

Notwithstanding the existence of the material weaknesses described below, management believes that the condensed consolidated financial statements and related financial information included in this Quarterly Report on Form 10-Q/A fairly present, in all material respects, our financial position, results of operations and cash flows as of and for the periods presented, in conformity with generally accepted accounting principles in the United States of America ("GAAP").

Based on the assessment, management determined that the Company did not maintain effective internal control over financial reporting as of March 31, 2023, as a result of material weaknesses in the following areas:

Control Environment, Risk Assessment, Monitoring Activities, Information and Communication of Policies and Procedures

We did not maintain appropriately designed entity-level controls impacting the control environment and effective monitoring controls to prevent or detect material misstatements to the consolidated financial statements. These deficiencies were attributed to (i) inadequate oversight and accountability over the performance of control activities primarily in the Asia geographic region, (ii) ineffective identification and assessment of risks to properly design, implement, and maintain relevant controls for revenue recognition, (iii) inadequate education and training in certain areas important to financial reporting, and (iv) ineffective controls over ensuring consistent commitment to integrity and ethical values.

Control Activities Related to Certain Business Processes

These material weaknesses contributed to the following additional material weaknesses related to the control activities within certain business processes:

•Asia Region - We did not operate effective controls across substantially all of the Asia region’s business processes that were in place to achieve timely, complete, and accurate financial accounting, reporting, and disclosures.

•Revenue Recognition - We did not appropriately design, implement and maintain effective controls over the revenue recognition process, relating to the proper application of Accounting Standards Codification Topic 606, Revenue from Contracts with Customers. The root cause of these control gaps was the inadequate or ineffective process level controls (including but not limited to controls around capturing and managing changes to customer order terms in the company’s records, timely processing of customer product returns, oversight of 3rd party business partners, and evaluating non-standard customer shipping terms, and ensuring consistent commitment to integrity and ethical values in documenting and recording revenue arrangements.

•Information Produced by the Entity – We did not have effective controls over the adequate testing of reports used in the operation of controls.

•Income Tax Controls - We did not operate effective controls surrounding deferred tax assets and liabilities and timeliness of performance of controls.

•Information Technology General Controls – We did not operate effective information technology general controls (“ITGC’s”) in the areas of user access, segregation of duties, and data processing related to certain information technology systems.

•Delivery Terms - In the fourth quarter of 2022, the Company entered a significant sales agreement with an existing customer which was subject to unique delivery terms. In reviewing the accounting for the revenue transaction, our management identified a deficiency in the effectiveness of a control intended to properly document and review relevant facts in connection with revenue recognition related to such transaction. Accordingly, a material error was detected in recorded revenue in our 2022 preliminary consolidated financial statements as a result of this misapplication of U.S. GAAP. The December 31, 2022 consolidated financial

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statements included in the 2022 Form 10-K filed on March 10, 2023 and in our earnings press release filed on February 16, 2023 with our Current Report on Form 8-K were corrected prior to issuance.

Remediation Plan and Status for Reported Material Weaknesses

We have been working and are currently working to remediate the material weaknesses described above, including assessing the need for additional remediation steps and implementing additional measures to remediate the underlying causes that gave rise to the material weaknesses. The Company is committed to a strong internal control environment as well as integrity and ethical values to ensure that a proper, consistent tone is communicated throughout the organization, including the expectation that previously existing deficiencies will be remediated through implementation of processes and controls to ensure strict compliance with GAAP and 2013 COSO framework.

As part of our commitment to strengthening our internal control over financial reporting, we have initiated or completed various personnel actions and remedial actions under the oversight of the Audit Committee, including:

•Initiated review and plan to enhance processes and controls around the IT environment and the use of key IT applications, including the storage, maintenance, the accessibility of transactional documentation, and the creation of key commercial documents within the Company’s Oracle system.

•Initiated review and plan to enhance processes and controls around internal control documentation and document retention.

•Review and design/improve the corporate compliance program', including:

◦Initiated a plan to Conduct an updated corporate risk assessment.

◦Completed a review, assessment, and update of the corporate code of conduct.

◦Issued statement from CEO on commitment to compliance and ethics and assess methods to regularly demonstrate effective “tone at the top” to foster culture of compliance

◦Plan to provide training to individuals who provide certifications or representations in connection with the company’s financial reporting on the meaning of the representations included therein.

◦Plan to develop and provide training throughout the organization on revenue recognition principles relating to the Company’s business, including specific training on issues discovered in the review.

◦Assessed, enhanced, and promoted the use of the whistleblower hotline, including making the hotline available to external parties

•Initiated an assessment and plan to enhance controls for corporate oversight of third-party manufacturers..

•Initiated a review and plan to assess the sufficiency of internal audit resources.

•Completed a review of all incentive and bonus compensation.

To address certain control activities related to material weakness in Revenue Recognition:

•Initiated a review and plan to improve internal controls and processes related to capturing and managing changes to transaction terms, including required documentation and approvals.

•Plan to evaluate the adequacy of internal controls related to warehousing provided in connection with product sales.

•Initiated a review and plan to improve internal controls and processes for customer refusal of delivery or indication of intent to return an order, including timely notification to designated accounting personnel.

•Plan to assess and enhance process for use of freight forwarders to address specific risks.

•Plan to assess and enhance corporate oversight of regional finance and accounting personnel.

•Plan to assess the adequacy of staffing in the accounting function.

•Plan to assess and enhance the contract review process to address financial reporting risk, including those related to inconsistencies in terms between the contract and transaction documents and non-standard transaction terms.

In addition to the remedial actions planned and undertaken under the oversight of the Audit Committee, we are in the process of, and continue to focus on, strengthening our internal controls over financial reporting to remediate the material weaknesses. Management’s additional initiated and completed remediation efforts for each identified material weakness include the following:

Table of Contents

•Asia Region

On April 5, 2024, the Company consummated the sale of its Asia operations to Korea-based DASAN Networks Inc. (DNI) and therefore, no longer needs to maintain internal controls over financial reporting for operations in the Asia region.

•Revenue Recognition and Delivery Terms

Subsequent to the discovery of the revenue recognition material weakness, we initiated or completed the following remedial actions starting in the third quarter of 2023:

◦Initiated the design and implementation of enhanced internal controls surrounding identification, review and analysis of key transaction terms including documentation and approvals affecting revenue recognition for product sales orders to ensure that transactions are recorded in accordance with Company’s policies and GAAP.

◦Initiated an evaluation of the adequacy and efficacy of controls related to warehousing provided in connection with product sales.

◦Initiated an evaluation of the adequacy and efficacy of controls and processes for customer refusal of delivery or indication of intent to return an order, including timely notification to designated accounting personnel.

◦We have enhanced our quarterly contract review process by implementing a quarterly certification program to ensure timely communication of modification of transaction terms by sales and operations personnel to identify inconsistencies between the contract and transaction documents and non-standard transaction terms.

◦We implemented participation in revenue recognition training programs by Company personnel.

•Information Produced by the Entity

◦Completed a review of controls over reports as part of the Company’s Q1 2023 implementation of Oracle Cloud.

◦Initiated a plan to enhance documentation retention policies around report parameters

◦Initiated a review of all reports used in controls in order to fully identify the control owners and provide training on appropriate control performance and documentation.

•Income Tax Controls

◦Initiated our review of remedial actions to be taken to address the lack of sufficient and accurate support used in the preparation of the tax provision.

◦Initiated our review of remedial actions to be taken to address the lack of timeliness in the performance of existing controls over the preparation of the tax provision.

The material weaknesses will not be considered remediated until the applicable remedial controls operate for a sufficient period of time and management has concluded, through testing, that these controls are operating effectively. Additional remediation measures may be required, which may require additional implementation time. We will continue to assess the effectiveness of our remediation efforts in connection with our evaluations of internal control over financial reporting.

We can give no assurance that the measures we take will remediate the material weaknesses that we identified or that any additional material weaknesses will not arise in the future. We will continue to monitor the effectiveness of these and other processes, procedures and controls and will make any further changes management determines appropriate.

Changes in Internal Control over Financial Reporting

Except for the material weaknesses described above, no other change in the Company’s internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) occurred during the quarter ended March 31, 2023, that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

Plume

Class Action

In June and August of 2023, DZS shareholders filed three putative securities class actions related to DZS’s June 1, 2023 Form 8-K announcing the Company’s intention to restate its financial statements for the first quarter of 2023. Each suit was filed in the Eastern District of Texas. All three cases allege violations of Sections 10(b) and 20(a) of the Exchange Act against DZS, its Chief Executive Officer and its Chief Financial Officer. The cases are: (1) Shim v. DZS et al., filed June 14, 2023; (2) Link v. DZS et al., filed June 27, 2023; and (3) Cody v. DZS et al., filed August 9, 2023.

Three potential lead plaintiffs filed applications for appointment on August 14, 2023. On September 12, 2023, the cases were consolidated under the lead case Shim v. DZS et al. The plaintiffs are seeking unspecified damages, interest, fees, costs and interest. As of July 31, 2024, the court has not yet ruled on the appointment of a lead plaintiff and the Defendants have not yet responded to any complaint. DZS intends to vigorously defend these lawsuits.

In light of the events giving rise to the restatement, DZS began cooperating, and intends to continue to cooperate, with the U.S. Securities and Exchange Commission (the “SEC”), which has informed DZS that it is investigating potential violations of the federal securities laws related to DZS.

On June 3, 2024, counsel for a shareholder of the Company sent the Company a demand for certain books and records related to events related to the Company’s June 1, 2023 Form 8-K. The demand was made pursuant to Section 220 of the Delaware General Corporation Law. While the Company does not concede the demand is proper, it has produced certain records to the shareholder.

In addition to the matters discussed above and the Notice discussed in Note 13 of the Notes to Unaudited Condensed Consolidated Financial Statements, from time to time, the Company is subject to various legal proceedings, claims and litigation arising in the ordinary course of business. While the outcome of these matters is currently not determinable, the Company records an accrual for legal contingencies that it has determined to be probable to the extent that the amount of the loss can be reasonably estimated. The Company does not expect that the ultimate costs to resolve these matters will have a material adverse effect on its consolidated financial position, results of operations or cash flows. However, litigation is subject to inherent uncertainties, and unfavorable rulings could occur. If an unfavorable ruling were to occur, there exists the possibility of a material adverse impact on the results of operations and cash flows of the reporting period in which the ruling occurs, or future periods.

Item 1A. Risk Factors

A list of factors that could materially affect our business, financial condition or operating results is described in Part I, Item 1A, “Risk Factors” in the 2022 Form 10-K/A. There have been no material changes to our risk factors from those disclosed in Part I, Item 1A, “Risk Factors” in the 2022 Form 10-K/A.

Item 5. Other Information

None.

Item 6. Exhibits

The exhibits required to be filed with this quarterly report on Form 10-Q/A are listed in the Exhibit Index attached hereto and are incorporated herein by reference.

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EXHIBIT INDEX


Exhibit Number			Description

3.1			Restated Certificate of Incorporation of DASAN Zhone Solutions, Inc. (incorporated by reference to Exhibit 3.1 to the Company’s Annual Report on Form 10-K filed with the SEC on September 27, 2017).

3.2			Certificate of Amendment to the Restated Certificate of Incorporation of DZS Inc. (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed with the SEC on August 27, 2020).

3.3			Amended and Restated Bylaws of DZS Inc. (incorporated by reference to Exhibit 3.2 to the Company’s Annual Report on Form 10-K filed with the SEC on March 11, 2021).

10.1			Credit Agreement, dated as of February 9, 2022, among DZS Inc., as Borrower, the other Loan Parties party thereto, the Lenders from time to time parties thereto and JPMorgan Chase Bank, N.A., as Administrative Agent (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on February 10, 2022).

10.2			First Amendment to Credit Agreement, dated as of May 27, 2022, among DZS Inc., as Borrower, the other Loan Parties party thereto, the Lenders party thereto and JPMorgan Chase Bank, N.A., as Administrative Agent (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on June 1, 2022).

10.3			Second Amendment to Credit Agreement, dated as of February 15, 2023, among DZS Inc., as Borrower, the other Loan Parties party thereto, the Lenders party thereto and JPMorgan Chase Bank, N.A., as Administrative Agent (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on February 16, 2023).

10.4			Third Amendment to Credit Agreement, dated as of May 8, 2023, among DZS Inc., as Borrower, the other Loan Parties party thereto, the Lenders party thereto and JPMorgan Chase Bank, N.A., as Administrative Agent (incorporated by reference to Exhibit 10.4 to the Company’s Quarterly Report on Form 10-Q filed with the SEC on May 9, 2023).

31.1*			Certification of Chief Executive Officer Pursuant to Rule 13a-14(a)/15d-14(a)

31.2*			Certification of Chief Financial Officer Pursuant to Rule 13a-14(a)/15d-14(a)

32.1*			Section 1350 Certification of Chief Executive Officer and Chief Financial Officer

101.INS			Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because XBRL tags are embedded within the Inline XBRL document

101.SCH			Inline XBRL Taxonomy Extension Schema With Embedded Linkbase Documents

104			Cover Page Interactive Data File (embedded within the Inline XBRL document and included in Exhibit 101)

*			Filed herewith.
+			Indicates management contract or compensatory plan, contract or arrangement.

Table of Contents

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.


	DZS INC.

Date: August 13, 2024
	By:	/s/ Charles Daniel Vogt
	Name:	Charles Daniel Vogt
	Title:	President and Chief Executive Officer

	By:	/s/ Misty Kawecki
	Name:	Misty Kawecki
	Title:	Chief Financial Officer
		(Principal Financial Officer)

	By:	/s/ Brian Chesnut
	Name:	Brian Chesnut
	Title:	Chief Accounting Officer
		(Principal Accounting Officer)

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO

RULE 13a-14(a)/15d-14(a)

I, Charles Daniel Vogt, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q/A of DZS Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 13, 2024


			/s/ CHARLES DANIEL VOGT
			Charles Daniel Vogt
			President and Chief Executive Officer

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO

RULE 13a-14(a)/15d-14(a)

I, Misty Kawecki, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q/A of DZS Inc.;

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 13, 2024


			/s/ MISTY KAWECKI
			Misty Kawecki
			Chief Financial Officer (Principal Financial and Accounting Officer)

Exhibit 32.1

SECTION 1350 CERTIFICATION

Pursuant to 18 U.S.C. Section 1350, Charles Daniel Vogt, President and Chief Executive Officer of DZS Inc. (the “Company”) and Misty Kawecki, Chief Financial Officer of the Company hereby certify that, to their knowledge:

1.The Company’s Quarterly Report on Form 10-Q/A for the quarter ended March 31, 2023 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 13, 2024


			/s/ CHARLES DANIEL VOGT
			Charles Daniel Vogt
			President and Chief Executive Officer

			/s/ MISTY KAWECKI
			Misty Kawecki
			Chief Financial Officer (Principal Financial and Accounting Officer)

Cover - shares	3 Months Ended
Cover - shares	Mar. 31, 2023	Aug. 05, 2024
Cover [Abstract]
Document Type	10-Q/A
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	000-32743
Entity Registrant Name	DZS INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	22-3509099
Entity Address, Address Line1	5700 Tennyson Parkway, Suite 400
Entity Address, City or Town	Plano
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75024
City Area Code	469
Local Phone Number	327-1531
Title of 12(b) Security	Common stock, $0.001 par value
Trading Symbol	DZSI
Security Exchange Name	NASDAQ
Entity Current Reporting Status	No
Entity Interactive Data Current	No
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		38,024,783
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Entity Central Index Key	0001101680
Amendment Flag	true
Document Fiscal Period Focus	Q1
Amendment Description	Subsequent to the issuance of the unaudited condensed consolidated financial statements as of March 31, 2023 and as previously disclosed on June 1, 2023, Management determined that the Company’s previously issued unaudited consolidated financial statements as of and for the three months ended March 31, 2023 (the “Q1 2023 Financial Statements”) contained a material accounting error relating to the timing of revenue recognition with respect to certain customer projects. As a result of this error, the Audit Committee determined that the Company’s Q1 2023 Financial Statements should no longer be relied upon and should be restated. In addition, as a result of the error, the Audit Committee initiated a review of the Company’s accounting for revenue recognition and the extent to which these matters affect the Company’s internal controls over financial reporting (the “Review”).On November 9, 2023, the Company disclosed that although the Review was still ongoing, based on preliminary findings, management had determined that the Company’s previously issued audited consolidated financial statements as of and for the year ended December 31, 2022 (the “2022 Annual Financial Statements”), as well as the Company’s previously issued unaudited condensed consolidated financial statements as of and for each of the three months ended March 31, 2022, the three and six months ended June 30, 2022 and the three and nine months ended September 30, 2022 (collectively, the “2022 Interim Financial Statements” and, together with the 2022 Annual Financial Statements, the “2022 Financial Statements” and, together with the Q1 2023 Financial Statements, the “Affected Financial Statements”), should no longer be relied upon and should be restated due to accounting errors in each of the 2022 Financial Statements relating to revenue recognition. During the course of the Review, and during the Company's subsequent assessment of its accounting practices, accounting and financial reporting errors were identified. Specifically, errors in timing of revenue recognition relating to incorrect shipping dates, incorrect or unapproved shipping terms, incorrect timing of the transfer of control, and incorrect evaluation of the existence of contracts. As a result, revenue, accounts receivable, contract assets and liabilities, inventory and cost of sales, goodwill, and the tax provision contained errors which resulted in corrections in accounting under U.S. GAAP related to the timing of revenue recognition under certain customer projects. See Restatement Note 1 to this Quarterly Report on Form 10-Q/A. We are filing this Amendment No. 1 to the Quarterly Report on Form 10-Q (“Form 10-Q/A”) for the quarterly period ended March 31, 2023, which was filed with the United States Securities and Exchange Commission (“SEC”) on May 9, 2023 (the “Original Filing”), to reflect restatements of the Condensed Consolidated Balance Sheets at March 31, 2022 and March 31 2023, the Condensed Consolidated Statements of Comprehensive Loss for the three months ended March 31, 2022 and March 31, 2023, and Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2022 and March 31, 2023, and the related notes thereto.The following sections in the Original Filing are revised in this Form 10-Q/A, solely as a result of, and to reflect, the restatement:Part I – Item. Financial StatementsPart I - Item 2. Management’s Discussion and Analysis of Financial Condition and Results of OperationsPart I - Item 3. Quantitative and Qualitative Disclosures about Market RiskPart I - Item 4. Controls and ProceduresPart II - Item 1. Legal ProceedingsPart II - Item 1A. Risk FactorsPart II - Item 6. ExhibitsPursuant to the rules of the SEC, Part II, Item 6 of the Original Filing has been amended to include the currently-dated certifications from our principal executive officer and principal financial officer, as required by Sections 302 and 906 of the Sarbanes-Oxley Act of 2002. The certifications of the principal executive officer and principal financial officer are included in this Form 10-Q/A as Exhibits 31.1, 31.2 and 32.1.For the convenience of the reader, this Form 10-Q/A sets forth the information in the Original Filing in its entirety, as such information is modified and superseded where necessary to reflect the restatement. This Form 10-Q/A should be read in conjunction with our filings with the SEC subsequent to the date of the Original Filing, in each case as those filings may have been, or with respect to filings for the Non-Reliance Periods will be, superseded or amended.

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 28,892	$ 34,347
Restricted cash	1,975	3,969
Accounts receivable - trade, net of allowance for credit losses of $16,087 as of March 31, 2023 and $16,184 as of December 31, 2022	106,291	134,471
Other receivables	20,752	16,144
Inventories	97,311	94,288
Contract assets	605	576
Prepaid expenses and other current assets	10,408	7,410
Total current assets	266,234	291,205
Property, plant and equipment, net	7,135	9,478
Right-of-use assets from operating leases	11,971	12,606
Goodwill	12,594	12,594
Intangible assets, net	30,422	31,742
Other assets	17,013	15,536
Total assets	345,369	373,161
Current liabilities:
Accounts payable - trade	107,904	118,667
Short-term debt – bank, trade facilities and secured borrowings	16,746	9,706
Current portion of long-term debt, net	23,660	24,073
Contract liabilities	16,614	18,705
Operating lease liabilities	4,859	4,834
Accrued and other liabilities	27,645	25,562
Total current liabilities	197,428	201,547
Long-term debt, net of current portion	0	0
Contract liabilities - non-current	6,584	7,788
Operating lease liabilities - non-current	10,499	11,417
Pension liabilities	11,060	11,021
Other long-term liabilities	2,583	2,806
Total liabilities	228,154	234,579
Commitments and contingencies (Note 13)
Stockholders’ equity:
Common stock, 36,000 shares authorized, 31,102 and 30,968 shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively, at $0.001 par value	31	30
Preferred stock, $0.001 par value, 25,000 shares authorized and no shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively	0	0
Additional paid-in capital	276,282	271,884
Accumulated other comprehensive loss	(6,611)	(4,662)
Accumulated deficit	(152,487)	(128,670)
Total stockholders’ equity	117,215	138,582
Total liabilities and stockholders’ equity	$ 345,369	$ 373,161

Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 16,087	$ 16,184
Common stock, authorized (in shares)	36,000,000	36,000,000
Common stock, issued (in shares)	31,102,000	30,968,000
Common stock, outstanding (in shares)	31,102,000	30,968,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, authorized (in shares)	25,000,000	25,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001

Unaudited Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2023

Mar. 31, 2022

Income Statement [Abstract]

Net revenue

$ 69,812

$ 71,990

Cost of revenue

47,318

46,599

Gross profit

22,494

25,391

Operating expenses:

Research and product development

14,851

11,844

Selling, marketing, general and administrative

24,781

17,742

Restructuring and other charges

4,152

436

Amortization of intangible assets

1,271

294

Total operating expenses

45,055

30,316

Operating loss

(22,561)

(4,925)

Interest expense, net

(792)

(90)

Other income (expense), net

728

(800)

Loss before income taxes

(22,625)

(5,815)

Income tax provision

1,192

1,771

Net loss

(23,817)

(7,586)

Foreign currency translation adjustments

^[1]

(1,889)

(268)

Actuarial loss

(60)

Comprehensive loss

$ (25,766)

$ (7,854)

Net loss per share

Basic (in dollars per share)

$ (0.77)

$ (0.28)

Diluted (in dollars per share)

$ (0.77)

$ (0.28)

Weighted average shares outstanding

Basic (in shares)

31,045,000

27,530,000

Diluted (in shares)

31,045,000

27,530,000

[1]	Includes net gain of $0.2 million and net loss of $0.4 million on intra-entity foreign currency transactions that are of a long-term investment nature for three months ended March 31, 2023 and 2022.

Unaudited Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Net gain (loss) on intra-entity foreign currency transactions	$ 0.2	$ (0.4)

Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative effect of ASC 326 adoption	Common stock	Additional paid-in capital	Accumulated other comprehensive loss	Accumulated deficit	Accumulated deficit Cumulative effect of ASC 326 adoption
Beginning Balance, Stockholders' equity (in shares) at Dec. 31, 2021			27,505
Beginning Balance, Stockholders' equity at Dec. 31, 2021	$ 131,907	$ (401)	$ 27	$ 223,336	$ (4,457)	$ (86,999)	$ (401)
Issuance of common stock upon vesting of restricted stock units, exercise of stock options and employee stock plan purchases, net of shares withheld for taxes (in shares)			98
Issuance of common stock upon vesting of restricted stock units, exercise of stock options and employee stock plan purchases, net of shares withheld for taxes	156			156
Stock-based compensation	2,671			2,671
Net loss (As Restated)	(7,586)					(7,586)
Subsidiary dissolution	(68)				(68)
Other comprehensive loss	(268)				(268)
Ending Balance, Stockholders' equity (in shares) at Mar. 31, 2022			27,603
Ending Balance, Stockholders' equity at Mar. 31, 2022	$ 126,411		$ 27	226,163	(4,793)	(94,986)
Beginning Balance, Stockholders' equity (in shares) at Dec. 31, 2022	30,968		30,968
Beginning Balance, Stockholders' equity at Dec. 31, 2022	$ 138,582		$ 30	271,884	(4,662)	(128,670)
Issuance of common stock upon vesting of restricted stock units, exercise of stock options and employee stock plan purchases, net of shares withheld for taxes (in shares)			134
Issuance of common stock upon vesting of restricted stock units, exercise of stock options and employee stock plan purchases, net of shares withheld for taxes	(87)		$ 1	(88)
Stock-based compensation	4,486			4,486
Net loss (As Restated)	(23,817)					(23,817)
Other comprehensive loss	$ (1,949)				(1,949)
Ending Balance, Stockholders' equity (in shares) at Mar. 31, 2023	31,102		31,102
Ending Balance, Stockholders' equity at Mar. 31, 2023	$ 117,215		$ 31	$ 276,282	$ (6,611)	$ (152,487)
Accounting Standards Update [Extensible Enumeration]	Cumulative effect of ASC 326 adoption

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (23,817)	$ (7,586)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,465	1,081
Amortization of deferred financing costs	60	0
Stock-based compensation	4,486	2,671
Provision for inventory write-down	1,086	705
Provision for credit losses, net of recoveries	(184)	(752)
Provision for sales returns	541	1,448
Provision for warranty expense	70	121
Unrealized loss on foreign currency transactions	1,396	874
Subsidiary dissolution	0	(68)
Loss on disposal of property, plant and equipment	40	0
Changes in operating assets and liabilities, excluding effects of acquisition:
Accounts receivable	26,466	6,418
Other receivable	(7,449)	126
Inventories	(2,060)	(14,557)
Contract assets	(29)	1,261
Prepaid expenses and other assets	(3,818)	(4,557)
Accounts payable	(11,316)	1,586
Contract liabilities	(3,265)	(43)
Accrued and other liabilities	159	540
Net cash used in operating activities	(15,169)	(10,732)
Cash flows from investing activities:
Proceeds from disposal of property, plant and equipment and other assets	1,790	0
Purchases of property, plant and equipment	(775)	(1,317)
Net cash provided by (used in) investing activities	1,015	(1,317)
Cash flows from financing activities:
Repayments of long-term borrowings	(313)	0
Proceeds from short-term borrowings and line of credit, net	8,918	0
Proceeds from related party term loan	4,059	0
Repayments of related party term loan	(5,845)	0
Payments for debt issue costs	(122)	(178)
Proceeds from exercise of stock awards and employee stock plan purchases	(87)	156
Net cash provided by (used in) financing activities	6,610	(22)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	96	(903)
Net change in cash, cash equivalents and restricted cash	(7,448)	(12,974)
Cash, cash equivalents and restricted cash at beginning of period	38,464	53,639
Cash, cash equivalents and restricted cash at end of period	31,016	40,665
Reconciliation of cash, cash equivalents and restricted cash to condensed consolidated balance sheets
Cash and cash equivalents	28,892	34,160
Restricted cash	1,975	6,343
Long-term restricted cash	149	162
Cash, cash equivalents and restricted cash	31,016	40,665
Cash paid during the period for:
Interest - bank and trade facilities	660	36
Interest - related party	64	0
Income taxes	$ 480	$ 283

Organization and Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Summary of Significant Accounting Policies

(1) Organization and Summary of Significant Accounting Policies

(a) Description of Business

(b) Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. GAAP, assuming the Company will continue as a going concern.

(d) Use of Estimates

(e) Restatement

Subsequent to the issuance of the unaudited condensed consolidated financial statements as of March 31, 2023 and as previously disclosed on June 1, 2023, Management determined that the Company’s previously issued unaudited consolidated financial statements as of and for the three months ended March 31, 2023 (the “Q1 2023 Financial Statements”) contained an accounting error relating to the timing of revenue recognition with respect to certain customer projects. As a result of this error, the Audit Committee determined that the Company’s Q1 2023 Financial Statements should no longer be relied upon and should be restated. In addition, as a result of the error, the Audit Committee initiated a review of the Company’s accounting for revenue recognition and the extent to which these matters affect the Company’s internal controls over financial reporting (the “Review”).

On November 9, 2023, the Company disclosed that although the Review was still ongoing, based on preliminary findings, management had determined that the Company’s previously issued audited condensed consolidated financial statements as of and for the year ended December 31, 2022 (the “2022 Annual Financial Statements”), as well as the Company’s previously issued unaudited condensed consolidated financial statements as of and for each of the three months ended March 31, 2022, the three and six months ended June 30, 2022 and the three and nine months ended September 30, 2022 (collectively, the “2022 Interim Financial Statements” and, together with the 2022 Annual Financial Statements, the “2022 Financial Statements” and, together with the Q1 2023 Financial Statements, the “Affected Financial Statements”), should no longer be relied upon and should be restated due to accounting errors in each of the 2022 Financial Statements relating to revenue recognition.

During the course of the Review, and during the Company's subsequent assessment of its accounting practices, accounting and financial reporting errors were identified. Specifically, errors in timing of revenue recognition relating to incorrect shipping dates, incorrect or unapproved shipping terms, incorrect timing of the transfer of control, and incorrect evaluation of the existence of contracts. As a result, revenue, accounts receivable, contract assets and liabilities, and inventory and cost of sales contained errors which resulted in corrections in accounting under U.S. GAAP related to the timing of revenue recognition under certain customer projects. Accordingly, the Company is restating its unaudited condensed consolidated financial statements for the three months ended March 31, 2022 and March 31, 2023, to correct these errors, the most significant of which are described below.

The following table presents the effect of the restatement on the Company's previously reported unaudited condensed consolidated balance sheet as of March 31, 2023 (in thousands, except par value).


	March 31, 2023
	As Previously Reported		Adjustments			As Restated
Assets
Current assets:
Cash and cash equivalents	$	28,892	$	—		$	28,892
Restricted cash	1,975		—			1,975
Accounts receivable - trade, net	141,029		(34,738)		(a)	106,291
Other receivables	21,518		(766)		(d)	20,752
Inventories	69,722		27,589		(a)(d)	97,311
Contract assets	605		—			605
Prepaid expenses and other current assets	10,689		(281)		(b)	10,408
Total current assets	274,430		(8,196)			266,234
Property, plant and equipment, net	7,135		—			7,135
Right-of-use assets from operating leases	11,971		—			11,971
Goodwill	19,952		(7,358)		(c)	12,594
Intangible assets, net	30,422		—			30,422
Other assets	17,013		—			17,013
Total assets	$	360,923	$	(15,554)		$	345,369
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable - trade	$	107,904	$	—		$	107,904
Short-term debt – bank, trade facilities and secured borrowings	16,746		—			16,746
Current portion of long-term debt	23,660		—			23,660
Contract liabilities	19,476		(2,862)		(a)(c)	16,614
Operating lease liabilities	4,859		—			4,859
Accrued and other liabilities	29,615		(1,970)		(b)	27,645
Total current liabilities	202,260		(4,832)			197,428
Long-term debt	—		—			—
Contract liabilities - non-current	6,636		(52)		(a)	6,584
Operating lease liabilities - non-current	10,499		—			10,499
Pension liabilities	11,060		—			11,060
Other long-term liabilities	2,583		—			2,583
Total liabilities	233,038		(4,884)			228,154

Stockholders’ equity:
Common stock	31		—			31
Additional paid-in capital	276,282		—			276,282
Accumulated other comprehensive loss	(6,462)		(149)		(a)	(6,611)
Accumulated deficit	(141,966)		(10,521)		(a)(b)	(152,487)
Total stockholders’ equity	127,885		(10,670)			117,215
Total liabilities and stockholders’ equity	$	360,923	$	(15,554)		$	345,369

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(c) Error corrections relating to the timing of revenue recognition with respect to ASSIA pre-acquisition customer projects.

(d) Error corrections relating to the classification of certain transactions on the Company's previously reported consolidated balance sheet.

The following table presents the effect of the restatement on the Company's previously reported consolidated balance sheet as of December 31, 2022 (in thousands, except par value).


	December 31, 2022
	As Previously Reported			Adjustments			As Restated
Assets
Current assets:
Cash and cash equivalents	$	34,347		$	—		$	34,347
Restricted cash	3,969			—			3,969
Accounts receivable - trade, net	153,780			(19,309)		(a)(d)	134,471
Other receivables	16,144			—			16,144
Inventories	78,513			15,775		(a)(d)	94,288
Contract assets	576			—			576
Prepaid expenses and other current assets	8,371			(961)		(b)	7,410
Total current assets	295,700			(4,495)			291,205
Property, plant and equipment, net	9,478			—			9,478
Right-of-use assets from operating leases	12,606			—			12,606
Goodwill	19,952			(7,358)		(c)	12,594
Intangible assets, net	31,742			—			31,742
Other assets	15,536			—			15,536
Total assets	$	385,014		$	(11,853)		$	373,161
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable - trade	$	121,225		$	(2,558)	(d)	$	118,667
Short-term debt – bank, trade facilities and secured borrowings	9,706			—			9,706
Current portion of long-term debt	24,073			—			24,073
Contract liabilities	21,777			(3,072)		(a)(c)	18,705
Operating lease liabilities	4,834			—			4,834
Accrued and other liabilities	27,559			(1,997)		(b)	25,562
Total current liabilities	209,174			(7,627)			201,547
Long-term debt	—			—			—
Contract liabilities - non-current	7,864			(76)		(a)	7,788
Operating lease liabilities - non-current	11,417			—			11,417
Pension liabilities	11,021			—			11,021
Other long-term liabilities	2,806			—			2,806
Total liabilities	242,282		242,282	(7,703)			234,579

Stockholders’ equity:
Common stock	30			—			30
Additional paid-in capital	271,884			—			271,884
Accumulated other comprehensive loss	(4,351)			(311)		(a)	(4,662)
Accumulated deficit	(124,831)			(3,839)		(a)(b)	(128,670)
Total stockholders’ equity	142,732			(4,150)			138,582
Total liabilities and stockholders’ equity	$	385,014		$	(11,853)		$	373,161

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(c) Error corrections relating to the timing of revenue recognition with respect to ASSIA pre-acquisition customer projects.

(d) Error corrections relating to the classification of certain transactions on the Company's previously reported consolidated balance sheet.


	Three Months Ended March 31, 2023
	As Previously Reported		Adjustments			As Restated
Net revenue	$	90,812	$	(21,000)	(a)	$	69,812
Cost of revenue	60,985		(13,667)		(a)	47,318
Gross profit	29,827		(7,333)			22,494
Operating expenses:
Research and product development	14,851		—			14,851
Selling, marketing, general and administrative	24,781		—			24,781
Restructuring and other charges	4,152		—			4,152
Amortization of intangible assets	1,271		—			1,271
Total operating expenses	45,055		—			45,055
Operating loss	(15,228)		(7,333)			(22,561)
Interest expense, net	(792)		—			(792)
Other income, net	728		—			728
Loss before income taxes	(15,292)		(7,333)			(22,625)
Income tax provision (benefit)	1,843		(651)		(b)	1,192
Net loss	(17,135)		(6,682)			(23,817)

Foreign currency translation adjustments	(2,051)		162		(a)	(1,889)
Actuarial loss	(60)		—			(60)
Comprehensive loss	$	(19,246)	$	(6,520)		$	(25,766)
Net loss per share
Basic	$	(0.55)	$	(0.22)		$	(0.77)
Diluted	$	(0.55)	$	(0.22)		$	(0.77)
Weighted average shares outstanding
Basic	31,045					31,045
Diluted	31,045					31,045

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.


	Three Months Ended March 31, 2022
	As Previously Reported		Adjustments			As Restated
Net revenue	$	77,040	$	(5,050)	(a)	$	71,990
Cost of revenue	50,215		(3,616)		(a)	46,599
Gross profit	26,825		(1,434)			25,391
Operating expenses:
Research and product development	11,844		—			11,844
Selling, marketing, general and administrative	17,742		—			17,742
Restructuring and other charges	436		—			436

Amortization of intangible assets	294		—			294
Total operating expenses	30,316		—			30,316
Operating loss	(3,491)		(1,434)			(4,925)
Interest income	37		—			37
Interest expense	(127)		—			(127)
Other expense, net	(800)		—			(800)
Loss before income taxes	(4,381)		(1,434)			(5,815)
Income tax provision (benefit)	(1,333)		3,104		(b)	1,771
Net loss	(3,048)		(4,538)			(7,586)

Foreign currency translation adjustments	(268)		—			(268)

Comprehensive loss	$	(3,316)	$	(4,538)		$	(7,854)
Net loss per share
Basic	$	(0.11)	$	(0.17)		$	(0.28)
Diluted	$	(0.11)	$	(0.17)		$	(0.28)
Weighted average shares outstanding
Basic	27,530					27,530
Diluted	27,530					27,530

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.


	Three Months Ended March 31, 2023
	As Previously Reported		Adjustments			As Restated
Cash flows from operating activities:
Net loss	$	(17,135)	$	(6,682)	(a)(b)	$	(23,817)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,465		—			2,465

Amortization of deferred financing costs	60		—			60
Stock-based compensation	4,486		—			4,486
Provision for inventory write-down	1,086		—			1,086
Provision for credit losses, net of recoveries	(184)		—			(184)
Provision for sales returns	541		—			541
Provision for warranty	70		—			70
Unrealized loss on foreign currency transactions	1,396		—			1,396

Loss on disposal of property, plant and equipment	40		—			40

Changes in operating assets and liabilities:
Accounts receivable	11,033		15,433		(a)(d)	26,466
Other receivable	(5,511)		(1,938)		(d)	(7,449)
Inventories	7,051		(9,111)		(a)(d)	(2,060)
Contract assets	(29)		—			(29)
Prepaid expenses and other assets	(3,138)		(680)		(b)	(3,818)
Accounts payable	(13,875)		2,559		(d)	(11,316)
Contract liabilities	(3,493)		228		(a)	(3,265)
Accrued and other liabilities	131		28		(b)	159
Net cash used in operating activities	(15,006)		(163)			(15,169)
Cash flows from investing activities:
Proceeds from disposal of property, plant and equipment and other assets	1,790		—			1,790
Purchases of property, plant and equipment	(775)		—			(775)

Net cash provided by investing activities	1,015		—			1,015
Cash flows from financing activities:


Repayments of long-term borrowings	(313)		—			(313)
Proceeds from short-term borrowings and line of credit, net	8,918		—			8,918

Proceeds from related party term loan	4,059		—			4,059
Repayments of related party term loan	(5,845)		—			(5,845)
Payments for debt issue costs	(122)		—			(122)

Proceeds from exercise of stock awards and employee stock plan purchases	(87)		—			(87)
Net cash provided by financing activities	6,610		—			6,610
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(67)		163		(a)	96
Net change in cash, cash equivalents and restricted cash	(7,448)		—			(7,448)
Cash, cash equivalents and restricted cash at beginning of period	38,464		—			38,464
Cash, cash equivalents and restricted cash at end of period	$	31,016	$	—		$	31,016

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(d) Error corrections relating to the classification of certain transactions on the Company's previously reported consolidated balance sheet.


	Three Months Ended March 31, 2022
	As Previously Reported		Adjustments			As Restated
Cash flows from operating activities:
Net loss	$	(3,048)	$	(4,538)	(a)(b)	$	(7,586)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,081		—			1,081


Stock-based compensation	2,671		—			2,671
Provision for inventory write-down	705		—			705
Provision for credit losses, net of recoveries	(752)		—			(752)
Provision for sales returns	1,448		—			1,448
Provision for warranty expense	121		—			121
Unrealized loss on foreign currency transactions	874		—			874
Subsidiary dissolution	(68)		—			(68)

Changes in operating assets and liabilities:
Accounts receivable	2,761		3,657		(a)	6,418
Other receivable	126		—			126
Inventories	(10,931)		(3,626)		(a)	(14,557)
Contract assets	1,261		—			1,261
Prepaid expenses and other assets	(7,577)		3,020		(b)	(4,557)
Accounts payable	1,586		—			1,586
Contract liabilities	(1,446)		1,403		(a)	(43)
Accrued and other liabilities	456		84		(b)	540
Net cash used in operating activities	(10,732)		—			(10,732)
Cash flows from investing activities:
Purchases of property, plant and equipment	(1,317)		—			(1,317)

Net cash used in investing activities	(1,317)		—			(1,317)
Cash flows from financing activities:



Payments for debt issue costs	(178)		—			(178)
Proceeds from exercise of stock awards and employee stock plan purchases	156		—			156
Net cash used in financing activities	(22)		—			(22)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(903)		—			(903)
Net increase in cash, cash equivalents and restricted cash	(12,974)		—			(12,974)
Cash, cash equivalents and restricted cash at beginning of period	53,639		—			53,639
Cash, cash equivalents and restricted cash at end of period	$	40,665	$	—		$	40,665

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(f) Disaggregation of Revenue

The following table presents revenues by product technology (in thousands):


	Three Months Ended March 31,
	2023		2022
	(As Restated)		(As Restated)
Access Networking Infrastructure	$	58,496	$	67,412
Cloud Software & Services	11,316		4,578
Total	$	69,812	$	71,990

The following table present revenues by geographical concentration (in thousands):


	Three Months Ended March 31,
	2023		2022
	(As Restated)		(As Restated)
Americas	$	24,975	$	22,924
Europe, Middle East, Africa	18,406		16,393
Asia	26,431		32,673
Total	$	69,812	$	71,990

(g) Concentration of Risk

Activity under the Company’s allowance for credit losses consists of the following (in thousands):


	Three Months Ended March 31,
	2023		2022
Balance at beginning of period	$	16,184	$	17,735
Charged to expense, net of recoveries	(184)		(752)
Cumulative effect of ASC 326 adoption	—		401
Foreign currency exchange impact	87		(326)
Balance at end of period	$	16,087	$	17,058

As of March 31, 2023 and December 31, 2022, no customers represented more than 10% of net accounts receivable.

As of March 31, 2023 and December 31, 2022, net accounts receivables from customers in countries other than the United States represented 81%.

(h) Business Combinations

(i) Restructuring and Other Charges

(j) Recent Accounting Pronouncements

Business Combinations

3 Months Ended

Mar. 31, 2023

Business Combination and Asset Acquisition [Abstract]

Business Combinations

(2) Business Combinations

ASSIA Acquisition

The following summarizes the final fair values of the assets acquired and liabilities assumed at the date of the ASSIA Acquisition (in thousands):


Allocation of purchase consideration
Cash and cash equivalents	$	203
Accounts receivable	2,322
Other assets	407
Right-of-use assets	2,172
Property, plant and equipment	232
Intangible assets	30,200
Accounts payable	(75)
Contract liabilities (As Restated)	(12,192)
Operating lease liabilities	(2,612)
Accrued and other liabilities	(756)
Goodwill (As Restated)	6,449
Total purchase consideration	$	26,350

The following table represents the final estimated fair value and useful lives of identifiable intangible assets acquired (estimated fair value in thousands):


	Estimated fair value		Estimated useful life
Intangible assets acquired
Customer relationships	$	18,600	15 years
Customer backlog	5,100		10 years
Developed technology	6,200		5 - 7 years
Tradenames	300		10 years
Total intangible assets	$	30,200

Fair Value Measurement

3 Months Ended

Mar. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurement

(3) Fair Value Measurement

Level 1 Inputs are quoted prices in active markets for identical assets or liabilities.

Level 3 Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable

Assets and Liabilities Measured at Fair Value on a Recurring Basis:

The following table reconciles the beginning and ending balances of the Company’s Level 3 contingent liability (in thousands):


	Three Months Ended March 31,
	2023		2022
Balance at beginning of period	$	1,156	$	2,121

Net change in fair value	27		51
Balance at end of period	$	1,183	$	2,172

Cash, Cash Equivalents and Restricted Cash	3 Months Ended
Cash, Cash Equivalents and Restricted Cash	Mar. 31, 2023
Cash and Cash Equivalents [Abstract]
Cash, Cash Equivalents and Restricted Cash	(4) Cash, Cash Equivalents and Restricted Cash As of March 31, 2023 and December 31, 2022, the Company's cash, cash equivalents and restricted cash consisted of financial deposits. Cash, cash equivalents and restricted cash held within the U.S. totaled $16.8 million and $24.9 million as of March 31, 2023 and December 31, 2022, respectively. Cash, cash equivalents and restricted cash held within the U.S. are held at FDIC insured depository institutions. Cash, cash equivalents and restricted cash held outside the U.S. totaled $14.1 million and $13.6 million as of March 31, 2023 and December 31, 2022, respectively. Restricted cash consisted primarily of cash collateral for performance bonds and warranty bonds. Long-term restricted cash was $0.1 million and $0.2 million as of March 31, 2023 and December 31, 2022, respectively, and is included in other assets on the unaudited condensed consolidated balance sheets.

Balance Sheet Details

3 Months Ended

Mar. 31, 2023

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Details

(5) Balance Sheet Details

Balance sheet detail as of March 31, 2023 and December 31, 2022 is as follows (in thousands):

Inventories


	March 31, 2023
	(As Restated)		December 31, 2022
Raw materials	$	35,870	$	37,354
Work in process	1,465		1,050
Finished goods	59,976		55,884
Total inventories	$	97,311	$	94,288

Provision for inventory write-down was $1.1 million and $0.7 million for the three months ended March 31, 2023 and March 31, 2022, respectively.

Property, plant and equipment


	March 31, 2023		December 31, 2022

Machinery and equipment	$	12,971	$	17,214
Leasehold improvements	2,440		5,683
Computers and software	4,608		4,713
Furniture and fixtures	2,108		1,748
Construction in progress and other	1,358		1,264
	23,485		30,622
Less: accumulated depreciation and amortization	(16,285)		(21,062)
Less: government grants	(65)		(82)
Total property, plant and equipment, net	$	7,135	$	9,478

Depreciation expense associated with property, plant and equipment for the three months ended March 31, 2023 and March 31, 2022 was $1.2 million and $0.8 million, respectively.

Warranties


	Three Months Ended March 31,
	2023		2022
Balance at beginning of period	$	1,896	$	1,981
Charged to cost of revenue	70		121
Claims and settlements	(113)		(149)
Foreign currency exchange impact	21		(17)
Balance at end of period	$	1,874	$	1,936

Contract Balances

The opening and closing balances of current and long-term contract assets and contract liabilities related to contracts with customers are as follows:


	Contract assets		Contract liabilities
December 31, 2022	$	576	$	26,493
March 31, 2023 (As Restated)	$	605	$	23,198

Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

(6) Goodwill and Intangible Assets

The following table summarizes the activity related to goodwill (in thousands):


	March 31,
	2023
	(As Restated)		2022
Balance at beginning of period, gross	$	13,597	$	7,148
Accumulated impairment at beginning of period	(1,003)		(1,003)
Goodwill from acquisitions	—		—
Foreign currency exchange impact	—		—
Balance at end of period	$	12,594	$	6,145

Intangible assets consisted of the following (in thousands):


	March 31, 2023
	Gross Carrying Amount		Accumulated Amortization		Net
Customer relationships	$	24,331	$	(5,451)	$	18,880
Customer backlog	5,100		(723)		4,377
Developed technology	11,207		(4,822)		6,385
In-process research and development	890		(385)		505
Tradenames	300		(25)		275
Total intangible assets, net	$	41,828	$	(11,406)	$	30,422


	December 31, 2022
	Gross Carrying Amount		Accumulated Amortization		Net
Customer relationships	$	24,330	$	(4,759)	$	19,571
Customer backlog	5,100		(506)		4,594
Developed technology	11,207		(4,463)		6,744
In-process research and development	890		(340)		550
Tradenames	300		(17)		283
Total intangible assets, net	$	41,827	$	(10,085)	$	31,742

Amortization expense associated with intangible assets for the three months ended March 31, 2023 and March 31, 2022 was $1.3 million and $0.3 million, respectively.

The following table presents the future amortization expense of the Company’s intangible assets as of March 31, 2023 (in thousands):


Remainder of 2023	$	3,962
2024	5,283
2025	5,278
2026	4,095
2027	3,143
Thereafter	8,661
Total	$	30,422

Debt

3 Months Ended

Mar. 31, 2023

Debt Disclosure [Abstract]

Debt

(7) Debt

The following table summarizes the Company’s debt (in thousands):


	March 31, 2023		December 31, 2022
JPMorgan Term Loan, long-term	$	—	$	—
JPMorgan Term Loan, current portion	24,063		24,375
Unamortized debt issuance costs	(403)		(302)
Long-term debt, including current portion	$	23,660	$	24,073
JPMorgan Revolving Credit Facility	$	12,000	$	4,000
Industrial Bank of Korea Loan	919		—
DNI Related Party Loan	3,827		5,706
Short-term debt and credit facilities	$	16,746	$	9,706
Total Debt	$	40,406	$	33,779

JPMorgan Credit Agreement

On May 27, 2022, the Company borrowed the full amount of the Term Loan to finance the ASSIA Acquisition.

As of March 31, 2023, the Company's debt obligation under the Term Loan was $23.7 million, net of unamortized issuance cost of $0.4 million, and of which $1.3 million is scheduled for payment in the next 12 months. The Company had $12.0 million outstanding debt and $1.2 million in letters of credit issued under the $30.0 million Revolving Credit Facility as of March 31, 2023, and, after entering into the Third Amendment, $16.8 million was available to the Company for additional borrowing under the Revolving Credit Facility.

The future principal maturities of the Company's debt obligations for each of the next five years are as follows (in thousands):


Remainder of 2023	$	938
2024	1,563
2025	1,875
2026	2,188
2027	17,499
Total	$	24,063

Related Party Debt

Industrial Bank of Korea Loan

Employee Benefit Plans	3 Months Ended
Employee Benefit Plans	Mar. 31, 2023
Retirement Benefits [Abstract]
Employee Benefit Plans	(8) Employee Benefit Plans Defined Contribution Plans The Company maintains a 401(k) plan for its employees in the US whereby eligible employees may contribute up to a specified percentage of their earnings, on a pretax basis, subject to the maximum amount permitted by the Internal Revenue Code. Under the 401(k) plan, the Company made discretionary contributions to the plan in 2022. For the three months ended March 31, 2023, the Company recorded an expense of $0.3 million. For the three months ended March 31, 2022, the Company recorded an expense of $0.2 million. The Company maintains a defined contribution plan for its employees in Korea. Under the defined contribution plan, the Company contributes the equivalent of 8.3% of an employee's gross salary into the plan. For each of the three months ended March 31, 2023 and March 31, 2022 the Company recorded an expense of $0.3 million. Defined Benefit Plans The Company sponsors defined benefit plans for its employees in Germany and Japan. Defined benefit plans provide pension benefits based on compensation and years of service. The Germany plans were frozen as of September 30, 2003 and have not been offered to new employees after that date. The Company has recorded the underfunded status as of March 31, 2023 and December 31, 2022 as a long-term liability on the unaudited condensed consolidated balance sheets. The accumulated benefit obligation for the plans in Germany and Japan was $11.1 million and $11.0 million as of March 31, 2023 and December 31, 2022, respectively. Periodic benefit costs for each of the three months ended March 31, 2023 and March 31, 2022 were $0.1 million. The Company holds pension insurance contracts, with the Company as beneficiary, in the amount of $2.5 million as of March 31, 2023 and December 31, 2022 related to individuals under the pension plans. The Company records these insurance contracts based on their cash surrender value at the balance sheet dates. These insurance contracts are classified as other assets on the Company’s unaudited condensed consolidated balance sheet. The Company intends to use any proceeds from these policies to fund the pension plans. However, since the Company is the beneficiary on these policies, these assets have not been designated pension plan assets.

Restructuring and Other Charges	3 Months Ended
Restructuring and Other Charges	Mar. 31, 2023
Restructuring and Related Activities [Abstract]
Restructuring and Other Charges	(9) Restructuring and Other Charges In 2021, the Company made the strategic decision to relocate manufacturing functions of DZS GmbH and Optelian to Seminole, Florida and to transition the above subsidiaries to sales and research and development centers. For the three months ended March 31, 2022, the Company recorded $0.4 million of related restructuring costs. The restructuring of DZS GmbH and Optelian was completed in 2022 and no related restructuring costs were recorded for the three months ended March 31, 2023. On September 17, 2022, DZS signed an agreement with Fabrinet, a third-party provider of electro-mechanical and electronic manufacturing and distribution services, to transition the sourcing, procurement, order-fulfillment, manufacturing and return merchandise authorization activities in the Company's Seminole, Florida facility to Fabrinet. The transition to Fabrinet began in October 2022 and substantially completed in the beginning of 2023. Post transition, the DZS Seminole, Florida-based operations, supply chain and manufacturing workforce will be reduced by approximately two-thirds and the remaining team is expected to be relocated to an appropriately sized facility. For the three months ended March 31, 2023, the Company recorded $3.5 million of restructuring related costs, consisting of freight and expedite fees of $1.0 million, facility and labor costs of $0.8 million, accelerated depreciation of manufacturing related assets of $0.4 million, termination-related benefits of $0.3 million, inventory write-off of $0.5 million, and other costs of $0.5 million. The Company accounted for the one-time employee termination benefits in accordance with ASC 420, Exit or Disposal Cost Obligations, and recognized the respective liability when the final terms of the benefit arrangement were communicated to the affected employees. As of March 31, 2023, the Company had $0.6 million liability related to termination benefits associated with Seminole restructuring. For the three months ended March 31, 2023, the Company also included in restructuring and other charges approximately $0.3 million of facility costs related to impaired facilities and $0.4 million of non-capitalizable implementation costs related to replacement of the Company’s legacy enterprise resource planning and reporting software.

Related Party Transactions

3 Months Ended

Mar. 31, 2023

Related Party Transactions

(10) Related Party Transactions

Related Party Debt


Guarantor	Amount Guaranteed (in thousands)		Description of Obligations Guaranteed
Dasan Networks, Inc.	$	4,422	Payment guarantee to Industrial Bank of Korea
Dasan Networks, Inc.	3,068		Payment guarantee to Shinhan Bank
	$	7,490

Other Related Party Transactions


	Three Months Ended March 31, 2023
Counterparty	Net revenue		Cost of revenue		Operating expense		Interest expense, net		Other expenses
Dasan Networks, Inc.	$	153	$	128	$	294	$	79	$	16


	Three Months Ended March 31, 2022
Counterparty	Net revenue		Cost of revenue		Operating expense		Interest expense, net		Other expenses
Dasan Networks, Inc.	$	198	$	177	$	407	$	—	$	17

Balances of Receivables and Payables with Related Parties


	As of March 31, 2023
Counterparty	Account receivables		Other receivables		Loans Payable		Accounts payable		Accrued and other liabilities
Dasan Networks, Inc.	$	224	$	—	$	3,827	$	895	$	212


	As of December 31, 2022
Counterparty	Account receivables		Other receivables		Loans Payable		Accounts payable		Accrued and other liabilities
Dasan Networks, Inc.	$	943	$	123	$	5,706	$	1,019	$	483

Net Income (Loss) Per Share

3 Months Ended

Mar. 31, 2023

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

(11) Net Loss Per Share


	Three months ended March 31,
	2023
	(As Restated)		2022
Net loss	$	(23,817)	$	(7,586)
Weighted average number of shares outstanding:
Basic	31,045		27,530
Effect of dilutive securities:
Stock options, restricted stock units and share awards	—		—
Diluted	31,045		27,530
Net loss per share:
Basic	$	(0.77)	$	(0.28)
Diluted	$	(0.77)	$	(0.28)


	Three months ended March 31,
	2023	2022
Outstanding stock options	563	939
Unvested restricted stock units	500	278

Leases

3 Months Ended

Mar. 31, 2023

Leases [Abstract]

Leases

(12) Leases

The following table presents the Company's future contractual rent obligations as of March 31, 2023 (in thousands):


Remainder of 2023	$	4,209
2024	5,131
2025	3,575
2026	2,232
2027	1,121
Thereafter	693
Total operating lease payments	16,961
Less: imputed interest	(1,603)
Total operating lease liabilities	$	15,358

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	(13) Commitments and Contingencies Performance Guarantees In the normal course of operations, from time to time, the Company arranges for the issuance of various types of performance guarantees, such as standby letters of credit or surety bonds. These instruments are arrangements under which the financial institution or surety provides a financial guarantee that the Company will perform in accordance with contractual or legal obligations. As of March 31, 2023, the Company had $15.6 million of performance guarantees in the form of bank guarantees or surety bonds guaranteed by third parties. Trade Compliance Matter During the first quarter of 2022, the Company received a notice letter from the Office of the Commissioner of Customs, Chennai II of the India Department of Revenue (the “Notice”) claiming the Company had allegedly mis-declared and incorrectly classified certain products imported to India by the Company at the time of clearance of customs. The Notice claims that due to such mis-declaration and incorrect classification of the imported products, the Company and its contract manufacturer in India underpaid duties approximating INR 299.6 million ($3.6 million USD based on exchange rates as of March 31, 2023) related to such products. The documents relied upon in the Notice were requested by the Company, however they are yet to be received. In the second quarter of 2023, the Company received a second notice letter issued by the Office of the Principal Commissioner of Customs (Air Cargo) Complex, Chennai VII Commissionerate claiming the alleged underpaid duties approximated INR 389.3 million ($4.7 million based on exchange rates as of March 31, 2023). The two notice letters cover substantially the same shipments and overlap in scope. The Company intends to vigorously defend itself in this matter. As we have not yet received the full contents of the Notice, we are unable to estimate a potential loss related to this matter, if any, which could range up to the full amount of the alleged unpaid duties, plus penalties and interest. Plume On October 10, 2022, Plume Design, Inc. (“Plume”) filed suit against DZS in the Superior Court of the State of Delaware, alleging that DZS breached a reseller contract with Plume and seeking $24.75 million in damages. The parties have completed briefing on dispositive motions, and a trial is currently set for October 7, 2024. DZS intends to vigorously defend this lawsuit. In addition to the matters discussed above, from time to time, the Company is subject to various legal proceedings, claims and litigation arising in the ordinary course of business. While the outcome of these matters is currently not determinable, the Company records an accrual for legal contingencies that it has determined to be probable to the extent that the amount of the loss can be reasonably estimated. The Company does not expect that the ultimate costs to resolve these matters will have a material adverse effect on its consolidated financial position, results of operations or cash flows. However, litigation is subject to inherent uncertainties, and unfavorable rulings could occur. If an unfavorable ruling were to occur, there exists the possibility of a material adverse impact on the results of operations and cash flows of the reporting period in which the ruling occurs, or future periods.

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	(14) Income Taxes Income tax provision for the three months ended March 31, 2023 was approximately $1.2 million on pre-tax loss of $22.6 million. Income tax provision for the three months ended March 31, 2022 was approximately $1.8 million on pre-tax loss of $5.8 million. As of March 31, 2023, the income tax rate varied from the United States statutory income tax rate primarily due to valuation allowances in North America, EMEA and Asia, mandatory R&D expense capitalization in the U.S., and foreign and state income tax rate differentials. Consistent with the prior periods, the Company continued to maintain valuation allowances in North America, EMEA and Asia.

Enterprise-Wide Information

3 Months Ended

Mar. 31, 2023

Segment Reporting [Abstract]

Enterprise-Wide Information

(15) Enterprise-Wide Information

The Company's property, plant and equipment, net of accumulated depreciation, were located in the following geographical areas (in thousands) as of March 31, 2023 and December 31, 2022:


	March 31, 2023		December 31, 2022
United States	$	3,870	$	5,725
Korea	2,440		2,706
Japan	619		644
Canada	—		157
Germany	88		110
Other	118		136
	$	7,135	$	9,478

Organization and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	(b) Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) for interim financial information and with the instructions to Form 10-Q and Article 3 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. GAAP for complete financial statements. These financial statements include the accounts of the Company and its wholly owned subsidiaries. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements of the Company and notes thereto included in the Company’s Annual Report on Form 10-K/A for the year ended December 31, 2022 filed with the Securities and Exchange Commission (“SEC”) on August 12, 2024. For a complete description of what the Company believes to be the critical accounting policies and estimates used in the preparation of its unaudited condensed consolidated financial statements, refer to the Company’s Annual Report on Form 10-K/A for the year ended December 31, 2022. All intercompany transactions and balances have been eliminated in consolidation. The unaudited condensed consolidated financial statements reflect all adjustments (consisting only of normal recurring adjustments) that, in the opinion of management, are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the current interim period are not necessarily indicative of results to be expected for the current year or any other period.
Risks and Uncertainties	(c) Risks and Uncertainties The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. GAAP, assuming the Company will continue as a going concern. We continue to be exposed to macroeconomic pressures in the post-COVID-19 environment, including concerns about energy costs, geopolitical issues, inflation, the availability and cost of credit, business and consumer confidence, and unemployment. We have seen improvement in our supply chain in 2023 as supply chain pricing, freight and logistics costs, product and component availability, and extended lead-times which were a challenge in 2021 and 2022 begin to alleviate in 2023 as the world economy recovers from the COVID-19 pandemic. We expect elevated costs for components and expedite fees to further improve throughout 2023. We conduct significant business in South Korea, Japan, Vietnam, India, Spain, and Canada, as well as in other countries in Europe, Asia-Pacific, Middle East and Latin America, all of which subject us to foreign currency exchange rate risk. The local currencies of our significant foreign subsidiaries are the South Korean Won ("KRW"), Japanese Yen ("JPY"), Euro ("EUR), and Pound Sterling ("GBP"). Revenues and operating expenses are typically denominated in the local currency of each country and result from transactions by our operations in these countries. However, a significant portion of our international cost of sales is denominated in the U.S. Dollar (“USD”). As of March 31, 2023, the Company's debt obligation under the Term Loan was $23.7 million, net of unamortized issuance cost of $0.4 million, of which $1.3 million is scheduled for payment in the next 12 months. Due to the risk of non-compliance with certain financial covenants in the next 12 months we classified the entire amount as a current liability. As of March 31, 2023, we were in discussion with the lenders to amend the debt agreement to mitigate the risk of non-compliance. Refer to Note 16 Subsequent events for further information about the amendment and subsequent termination of the JPMorgan Credit Agreement. In addition to negotiating for revised financial covenants, we continue to focus on cost management, operating efficiency and efficient discretionary spending. Management is actively taking measures to enhance profitability and liquidity, including reducing the Company’s cost structure and cash outflows, including its investment in inventory, and managing receivable balances through aggressive collection efforts and tighter customers payment terms. These plans are not completely within the Company’s control, as some actions are dependent on the Company’s lenders, vendors and customers. However, the Company believes that it will maintain liquidity in the next 12 months to support its operations.
Use of Estimates	(d) Use of Estimates The preparation of the unaudited condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ materially from those estimates.
Concentration of Risk	(g) Concentration of Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash, cash equivalents and restricted cash, accounts receivables, and contract assets. Cash, cash equivalents and restricted cash consist of financial deposits and money market accounts that are principally held with various domestic and international financial institutions with high credit standing. As of March 31, 2023, the Company had cash accounts in excess of Federal Deposit Insurance Corporation ("FDIC") insured limits. The Company’s customers include competitive and incumbent local exchange carriers, competitive access providers, internet service providers, wireless carriers and resellers serving these markets. The Company performs ongoing credit evaluations of its customers and generally does not require collateral. Allowances are maintained for potential doubtful accounts based upon the expected collectability of accounts receivable using historical loss rates adjusted for customer-specific factors and current economic conditions. The Company determines historical loss rates on a rational and systematic basis. The Company performs periodic assessments of its customers’ liquidity and financial condition through analysis of information obtained from credit rating agencies, financial statement review and historical and current collection trends.
Business Combinations	(h) Business Combinations We account for business combinations using the acquisition method, which requires the identification of the acquirer, the determination of the acquisition date and the allocation of the purchase price paid by the acquirer to the identifiable tangible and intangible assets acquired, the liabilities assumed, including any contingent consideration and any noncontrolling interest in the acquiree at their acquisition date fair values. Goodwill represents the excess of the purchase price over the fair value of net assets acquired, including the amount assigned to identifiable intangible assets. Identifiable intangible assets with finite lives are amortized over their expected useful lives. Acquisition-related costs are expensed in the periods in which the costs are incurred. The results of operations of acquired businesses are included in our consolidated financial statements from the acquisition date.
Restructuring and Other Charges	(i) Restructuring and Other Charges From time to time, the Company takes actions to align its workforce, facilities and operating costs with perceived market opportunities, business strategies and changes in market and business conditions. The Company recognizes a liability for the cost associated with an exit or disposal activity in the period in which the liability is incurred, except for one-time employee termination benefits, which are measured at the communication date and recognized ratably over the required service period, if any.
Recent Accounting Pronouncements	(j) Recent Accounting Pronouncements In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, which requires the Company to apply ASC 606, Revenue from Contracts with Customers, to recognize and measure contract assets and contract liabilities from contracts with customers acquired in a business combination. Before the update such balances were measured and recognized at fair value on the acquisition date. The ASU is effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. Early adoption is permitted, including in interim periods. The Company adopted these requirements prospectively, effective on the first day of the second quarter of year 2022. There was no material impact on our consolidated financial statements on the adoption date. In June 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires the Company to measure and recognize expected credit losses for financial assets held and not accounted for at fair value through net income. In November 2018, April 2019 and May 2019, the FASB issued ASU No. 2018-19, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments - Credit Losses, and ASU No. 2019-05, Financial Instruments - Credit Losses (Topic 326): Targeted Transition Relief, which provided additional implementation guidance on the previously issued ASU. The Company adopted the updated guidance on January 1, 2022, utilizing the modified retrospective transition method and recorded a cumulative-effect adjustment of $0.4 million to accumulated deficit.

Organization and Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Revenues by Source

The following table presents revenues by product technology (in thousands):


	Three Months Ended March 31,
	2023		2022
	(As Restated)		(As Restated)
Access Networking Infrastructure	$	58,496	$	67,412
Cloud Software & Services	11,316		4,578
Total	$	69,812	$	71,990

Schedule of Information Revenues by Geographical Concentration

The following table present revenues by geographical concentration (in thousands):


	Three Months Ended March 31,
	2023		2022
	(As Restated)		(As Restated)
Americas	$	24,975	$	22,924
Europe, Middle East, Africa	18,406		16,393
Asia	26,431		32,673
Total	$	69,812	$	71,990

Schedule of Allowances for Doubtful Accounts

Activity under the Company’s allowance for credit losses consists of the following (in thousands):


	Three Months Ended March 31,
	2023		2022
Balance at beginning of period	$	16,184	$	17,735
Charged to expense, net of recoveries	(184)		(752)
Cumulative effect of ASC 326 adoption	—		401
Foreign currency exchange impact	87		(326)
Balance at end of period	$	16,087	$	17,058

Schedule of Error Corrections and Prior Period Adjustments

The following table presents the effect of the restatement on the Company's previously reported unaudited condensed consolidated balance sheet as of March 31, 2023 (in thousands, except par value).


	March 31, 2023
	As Previously Reported		Adjustments			As Restated
Assets
Current assets:
Cash and cash equivalents	$	28,892	$	—		$	28,892
Restricted cash	1,975		—			1,975
Accounts receivable - trade, net	141,029		(34,738)		(a)	106,291
Other receivables	21,518		(766)		(d)	20,752
Inventories	69,722		27,589		(a)(d)	97,311
Contract assets	605		—			605
Prepaid expenses and other current assets	10,689		(281)		(b)	10,408
Total current assets	274,430		(8,196)			266,234
Property, plant and equipment, net	7,135		—			7,135
Right-of-use assets from operating leases	11,971		—			11,971
Goodwill	19,952		(7,358)		(c)	12,594
Intangible assets, net	30,422		—			30,422
Other assets	17,013		—			17,013
Total assets	$	360,923	$	(15,554)		$	345,369
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable - trade	$	107,904	$	—		$	107,904
Short-term debt – bank, trade facilities and secured borrowings	16,746		—			16,746
Current portion of long-term debt	23,660		—			23,660
Contract liabilities	19,476		(2,862)		(a)(c)	16,614
Operating lease liabilities	4,859		—			4,859
Accrued and other liabilities	29,615		(1,970)		(b)	27,645
Total current liabilities	202,260		(4,832)			197,428
Long-term debt	—		—			—
Contract liabilities - non-current	6,636		(52)		(a)	6,584
Operating lease liabilities - non-current	10,499		—			10,499
Pension liabilities	11,060		—			11,060
Other long-term liabilities	2,583		—			2,583
Total liabilities	233,038		(4,884)			228,154

Stockholders’ equity:
Common stock	31		—			31
Additional paid-in capital	276,282		—			276,282
Accumulated other comprehensive loss	(6,462)		(149)		(a)	(6,611)
Accumulated deficit	(141,966)		(10,521)		(a)(b)	(152,487)
Total stockholders’ equity	127,885		(10,670)			117,215
Total liabilities and stockholders’ equity	$	360,923	$	(15,554)		$	345,369

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(c) Error corrections relating to the timing of revenue recognition with respect to ASSIA pre-acquisition customer projects.

(d) Error corrections relating to the classification of certain transactions on the Company's previously reported consolidated balance sheet.

The following table presents the effect of the restatement on the Company's previously reported consolidated balance sheet as of December 31, 2022 (in thousands, except par value).


	December 31, 2022
	As Previously Reported			Adjustments			As Restated
Assets
Current assets:
Cash and cash equivalents	$	34,347		$	—		$	34,347
Restricted cash	3,969			—			3,969
Accounts receivable - trade, net	153,780			(19,309)		(a)(d)	134,471
Other receivables	16,144			—			16,144
Inventories	78,513			15,775		(a)(d)	94,288
Contract assets	576			—			576
Prepaid expenses and other current assets	8,371			(961)		(b)	7,410
Total current assets	295,700			(4,495)			291,205
Property, plant and equipment, net	9,478			—			9,478
Right-of-use assets from operating leases	12,606			—			12,606
Goodwill	19,952			(7,358)		(c)	12,594
Intangible assets, net	31,742			—			31,742
Other assets	15,536			—			15,536
Total assets	$	385,014		$	(11,853)		$	373,161
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable - trade	$	121,225		$	(2,558)	(d)	$	118,667
Short-term debt – bank, trade facilities and secured borrowings	9,706			—			9,706
Current portion of long-term debt	24,073			—			24,073
Contract liabilities	21,777			(3,072)		(a)(c)	18,705
Operating lease liabilities	4,834			—			4,834
Accrued and other liabilities	27,559			(1,997)		(b)	25,562
Total current liabilities	209,174			(7,627)			201,547
Long-term debt	—			—			—
Contract liabilities - non-current	7,864			(76)		(a)	7,788
Operating lease liabilities - non-current	11,417			—			11,417
Pension liabilities	11,021			—			11,021
Other long-term liabilities	2,806			—			2,806
Total liabilities	242,282		242,282	(7,703)			234,579

Stockholders’ equity:
Common stock	30			—			30
Additional paid-in capital	271,884			—			271,884
Accumulated other comprehensive loss	(4,351)			(311)		(a)	(4,662)
Accumulated deficit	(124,831)			(3,839)		(a)(b)	(128,670)
Total stockholders’ equity	142,732			(4,150)			138,582
Total liabilities and stockholders’ equity	$	385,014		$	(11,853)		$	373,161

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(c) Error corrections relating to the timing of revenue recognition with respect to ASSIA pre-acquisition customer projects.

(d) Error corrections relating to the classification of certain transactions on the Company's previously reported consolidated balance sheet.


	Three Months Ended March 31, 2023
	As Previously Reported		Adjustments			As Restated
Net revenue	$	90,812	$	(21,000)	(a)	$	69,812
Cost of revenue	60,985		(13,667)		(a)	47,318
Gross profit	29,827		(7,333)			22,494
Operating expenses:
Research and product development	14,851		—			14,851
Selling, marketing, general and administrative	24,781		—			24,781
Restructuring and other charges	4,152		—			4,152
Amortization of intangible assets	1,271		—			1,271
Total operating expenses	45,055		—			45,055
Operating loss	(15,228)		(7,333)			(22,561)
Interest expense, net	(792)		—			(792)
Other income, net	728		—			728
Loss before income taxes	(15,292)		(7,333)			(22,625)
Income tax provision (benefit)	1,843		(651)		(b)	1,192
Net loss	(17,135)		(6,682)			(23,817)

Foreign currency translation adjustments	(2,051)		162		(a)	(1,889)
Actuarial loss	(60)		—			(60)
Comprehensive loss	$	(19,246)	$	(6,520)		$	(25,766)
Net loss per share
Basic	$	(0.55)	$	(0.22)		$	(0.77)
Diluted	$	(0.55)	$	(0.22)		$	(0.77)
Weighted average shares outstanding
Basic	31,045					31,045
Diluted	31,045					31,045

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.


	Three Months Ended March 31, 2022
	As Previously Reported		Adjustments			As Restated
Net revenue	$	77,040	$	(5,050)	(a)	$	71,990
Cost of revenue	50,215		(3,616)		(a)	46,599
Gross profit	26,825		(1,434)			25,391
Operating expenses:
Research and product development	11,844		—			11,844
Selling, marketing, general and administrative	17,742		—			17,742
Restructuring and other charges	436		—			436

Amortization of intangible assets	294		—			294
Total operating expenses	30,316		—			30,316
Operating loss	(3,491)		(1,434)			(4,925)
Interest income	37		—			37
Interest expense	(127)		—			(127)
Other expense, net	(800)		—			(800)
Loss before income taxes	(4,381)		(1,434)			(5,815)
Income tax provision (benefit)	(1,333)		3,104		(b)	1,771
Net loss	(3,048)		(4,538)			(7,586)

Foreign currency translation adjustments	(268)		—			(268)

Comprehensive loss	$	(3,316)	$	(4,538)		$	(7,854)
Net loss per share
Basic	$	(0.11)	$	(0.17)		$	(0.28)
Diluted	$	(0.11)	$	(0.17)		$	(0.28)
Weighted average shares outstanding
Basic	27,530					27,530
Diluted	27,530					27,530

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.


	Three Months Ended March 31, 2023
	As Previously Reported		Adjustments			As Restated
Cash flows from operating activities:
Net loss	$	(17,135)	$	(6,682)	(a)(b)	$	(23,817)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,465		—			2,465

Amortization of deferred financing costs	60		—			60
Stock-based compensation	4,486		—			4,486
Provision for inventory write-down	1,086		—			1,086
Provision for credit losses, net of recoveries	(184)		—			(184)
Provision for sales returns	541		—			541
Provision for warranty	70		—			70
Unrealized loss on foreign currency transactions	1,396		—			1,396

Loss on disposal of property, plant and equipment	40		—			40

Changes in operating assets and liabilities:
Accounts receivable	11,033		15,433		(a)(d)	26,466
Other receivable	(5,511)		(1,938)		(d)	(7,449)
Inventories	7,051		(9,111)		(a)(d)	(2,060)
Contract assets	(29)		—			(29)
Prepaid expenses and other assets	(3,138)		(680)		(b)	(3,818)
Accounts payable	(13,875)		2,559		(d)	(11,316)
Contract liabilities	(3,493)		228		(a)	(3,265)
Accrued and other liabilities	131		28		(b)	159
Net cash used in operating activities	(15,006)		(163)			(15,169)
Cash flows from investing activities:
Proceeds from disposal of property, plant and equipment and other assets	1,790		—			1,790
Purchases of property, plant and equipment	(775)		—			(775)

Net cash provided by investing activities	1,015		—			1,015
Cash flows from financing activities:


Repayments of long-term borrowings	(313)		—			(313)
Proceeds from short-term borrowings and line of credit, net	8,918		—			8,918

Proceeds from related party term loan	4,059		—			4,059
Repayments of related party term loan	(5,845)		—			(5,845)
Payments for debt issue costs	(122)		—			(122)

Proceeds from exercise of stock awards and employee stock plan purchases	(87)		—			(87)
Net cash provided by financing activities	6,610		—			6,610
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(67)		163		(a)	96
Net change in cash, cash equivalents and restricted cash	(7,448)		—			(7,448)
Cash, cash equivalents and restricted cash at beginning of period	38,464		—			38,464
Cash, cash equivalents and restricted cash at end of period	$	31,016	$	—		$	31,016

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(d) Error corrections relating to the classification of certain transactions on the Company's previously reported consolidated balance sheet.


	Three Months Ended March 31, 2022
	As Previously Reported		Adjustments			As Restated
Cash flows from operating activities:
Net loss	$	(3,048)	$	(4,538)	(a)(b)	$	(7,586)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,081		—			1,081


Stock-based compensation	2,671		—			2,671
Provision for inventory write-down	705		—			705
Provision for credit losses, net of recoveries	(752)		—			(752)
Provision for sales returns	1,448		—			1,448
Provision for warranty expense	121		—			121
Unrealized loss on foreign currency transactions	874		—			874
Subsidiary dissolution	(68)		—			(68)

Changes in operating assets and liabilities:
Accounts receivable	2,761		3,657		(a)	6,418
Other receivable	126		—			126
Inventories	(10,931)		(3,626)		(a)	(14,557)
Contract assets	1,261		—			1,261
Prepaid expenses and other assets	(7,577)		3,020		(b)	(4,557)
Accounts payable	1,586		—			1,586
Contract liabilities	(1,446)		1,403		(a)	(43)
Accrued and other liabilities	456		84		(b)	540
Net cash used in operating activities	(10,732)		—			(10,732)
Cash flows from investing activities:
Purchases of property, plant and equipment	(1,317)		—			(1,317)

Net cash used in investing activities	(1,317)		—			(1,317)
Cash flows from financing activities:



Payments for debt issue costs	(178)		—			(178)
Proceeds from exercise of stock awards and employee stock plan purchases	156		—			156
Net cash used in financing activities	(22)		—			(22)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(903)		—			(903)
Net increase in cash, cash equivalents and restricted cash	(12,974)		—			(12,974)
Cash, cash equivalents and restricted cash at beginning of period	53,639		—			53,639
Cash, cash equivalents and restricted cash at end of period	$	40,665	$	—		$	40,665

The impact of each error for the corresponding period in the above table is described below:

(a) Error corrections relating to the timing of revenue recognition with respect to certain customer projects.

(b) Tax impact on the error corrections relating to the timing of revenue recognition with respect to certain customer projects.

Business Combinations (Tables)

3 Months Ended

Mar. 31, 2023

Business Combination and Asset Acquisition [Abstract]

Summary of Provisional Estimated Fair Values of Assets Acquired and Liabilities Assumed

The following summarizes the final fair values of the assets acquired and liabilities assumed at the date of the ASSIA Acquisition (in thousands):


Allocation of purchase consideration
Cash and cash equivalents	$	203
Accounts receivable	2,322
Other assets	407
Right-of-use assets	2,172
Property, plant and equipment	232
Intangible assets	30,200
Accounts payable	(75)
Contract liabilities (As Restated)	(12,192)
Operating lease liabilities	(2,612)
Accrued and other liabilities	(756)
Goodwill (As Restated)	6,449
Total purchase consideration	$	26,350

Schedule of Estimated Fair Value and Useful Lives of Identifiable Intangible Assets

The following table represents the final estimated fair value and useful lives of identifiable intangible assets acquired (estimated fair value in thousands):


	Estimated fair value		Estimated useful life
Intangible assets acquired
Customer relationships	$	18,600	15 years
Customer backlog	5,100		10 years
Developed technology	6,200		5 - 7 years
Tradenames	300		10 years
Total intangible assets	$	30,200

Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2023

Fair Value Disclosures [Abstract]

Schedule of Reconciliation of Level 3 Contingent Liability

The following table reconciles the beginning and ending balances of the Company’s Level 3 contingent liability (in thousands):


	Three Months Ended March 31,
	2023		2022
Balance at beginning of period	$	1,156	$	2,121

Net change in fair value	27		51
Balance at end of period	$	1,183	$	2,172

Balance Sheet Details (Tables)

3 Months Ended

Mar. 31, 2023

Balance Sheet Related Disclosures [Abstract]

Schedule of Inventories

Inventories


	March 31, 2023
	(As Restated)		December 31, 2022
Raw materials	$	35,870	$	37,354
Work in process	1,465		1,050
Finished goods	59,976		55,884
Total inventories	$	97,311	$	94,288

Schedule of Property, Plant and Equipment, Net

Property, plant and equipment


	March 31, 2023		December 31, 2022

Machinery and equipment	$	12,971	$	17,214
Leasehold improvements	2,440		5,683
Computers and software	4,608		4,713
Furniture and fixtures	2,108		1,748
Construction in progress and other	1,358		1,264
	23,485		30,622
Less: accumulated depreciation and amortization	(16,285)		(21,062)
Less: government grants	(65)		(82)
Total property, plant and equipment, net	$	7,135	$	9,478

Summary of Product Warranty Liability

The following table summarizes the activity related to the product warranty liability:


	Three Months Ended March 31,
	2023		2022
Balance at beginning of period	$	1,896	$	1,981
Charged to cost of revenue	70		121
Claims and settlements	(113)		(149)
Foreign currency exchange impact	21		(17)
Balance at end of period	$	1,874	$	1,936

Summary of Contract Assets and Contract Liabilities Related to Contracts with Customers

The opening and closing balances of current and long-term contract assets and contract liabilities related to contracts with customers are as follows:


	Contract assets		Contract liabilities
December 31, 2022	$	576	$	26,493
March 31, 2023 (As Restated)	$	605	$	23,198

Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table summarizes the activity related to goodwill (in thousands):


	March 31,
	2023
	(As Restated)		2022
Balance at beginning of period, gross	$	13,597	$	7,148
Accumulated impairment at beginning of period	(1,003)		(1,003)
Goodwill from acquisitions	—		—
Foreign currency exchange impact	—		—
Balance at end of period	$	12,594	$	6,145

Schedule of Intangible Assets

Intangible assets consisted of the following (in thousands):


	March 31, 2023
	Gross Carrying Amount		Accumulated Amortization		Net
Customer relationships	$	24,331	$	(5,451)	$	18,880
Customer backlog	5,100		(723)		4,377
Developed technology	11,207		(4,822)		6,385
In-process research and development	890		(385)		505
Tradenames	300		(25)		275
Total intangible assets, net	$	41,828	$	(11,406)	$	30,422


	December 31, 2022
	Gross Carrying Amount		Accumulated Amortization		Net
Customer relationships	$	24,330	$	(4,759)	$	19,571
Customer backlog	5,100		(506)		4,594
Developed technology	11,207		(4,463)		6,744
In-process research and development	890		(340)		550
Tradenames	300		(17)		283
Total intangible assets, net	$	41,827	$	(10,085)	$	31,742

Future Amortization Expense of Intangible Assets

The following table presents the future amortization expense of the Company’s intangible assets as of March 31, 2023 (in thousands):


Remainder of 2023	$	3,962
2024	5,283
2025	5,278
2026	4,095
2027	3,143
Thereafter	8,661
Total	$	30,422

Debt (Tables)

3 Months Ended

Mar. 31, 2023

Debt Disclosure [Abstract]

Schedule of Debt

The following table summarizes the Company’s debt (in thousands):


	March 31, 2023		December 31, 2022
JPMorgan Term Loan, long-term	$	—	$	—
JPMorgan Term Loan, current portion	24,063		24,375
Unamortized debt issuance costs	(403)		(302)
Long-term debt, including current portion	$	23,660	$	24,073
JPMorgan Revolving Credit Facility	$	12,000	$	4,000
Industrial Bank of Korea Loan	919		—
DNI Related Party Loan	3,827		5,706
Short-term debt and credit facilities	$	16,746	$	9,706
Total Debt	$	40,406	$	33,779

Schedule of Future Principal Maturities of Term Loan

The future principal maturities of the Company's debt obligations for each of the next five years are as follows (in thousands):


Remainder of 2023	$	938
2024	1,563
2025	1,875
2026	2,188
2027	17,499
Total	$	24,063

Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2023

Schedule of Related Party Transactions


Guarantor	Amount Guaranteed (in thousands)		Description of Obligations Guaranteed
Dasan Networks, Inc.	$	4,422	Payment guarantee to Industrial Bank of Korea
Dasan Networks, Inc.	3,068		Payment guarantee to Shinhan Bank
	$	7,490

, cost of revenue, operating expense, interest expense, net and other expenses to and from related parties were as follows (in thousands) for the three months ended March 31, 2023 and 2022:


	Three Months Ended March 31, 2023
Counterparty	Net revenue		Cost of revenue		Operating expense		Interest expense, net		Other expenses
Dasan Networks, Inc.	$	153	$	128	$	294	$	79	$	16


	Three Months Ended March 31, 2022
Counterparty	Net revenue		Cost of revenue		Operating expense		Interest expense, net		Other expenses
Dasan Networks, Inc.	$	198	$	177	$	407	$	—	$	17


	As of March 31, 2023
Counterparty	Account receivables		Other receivables		Loans Payable		Accounts payable		Accrued and other liabilities
Dasan Networks, Inc.	$	224	$	—	$	3,827	$	895	$	212


	As of December 31, 2022
Counterparty	Account receivables		Other receivables		Loans Payable		Accounts payable		Accrued and other liabilities
Dasan Networks, Inc.	$	943	$	123	$	5,706	$	1,019	$	483

Net Income (Loss) Per Share (Tables)

3 Months Ended

Mar. 31, 2023

Earnings Per Share [Abstract]

Reconciliation of Basic and Diluted Net Income (Loss) per Share


	Three months ended March 31,
	2023
	(As Restated)		2022
Net loss	$	(23,817)	$	(7,586)
Weighted average number of shares outstanding:
Basic	31,045		27,530
Effect of dilutive securities:
Stock options, restricted stock units and share awards	—		—
Diluted	31,045		27,530
Net loss per share:
Basic	$	(0.77)	$	(0.28)
Diluted	$	(0.77)	$	(0.28)

Potential Common Stock Not Included Diluted Net Income (Loss) Per Share Calculation


	Three months ended March 31,
	2023	2022
Outstanding stock options	563	939
Unvested restricted stock units	500	278

Leases (Tables)

3 Months Ended

Mar. 31, 2023

Leases [Abstract]

Maturity of Operating Lease Liabilities

The following table presents the Company's future contractual rent obligations as of March 31, 2023 (in thousands):


Remainder of 2023	$	4,209
2024	5,131
2025	3,575
2026	2,232
2027	1,121
Thereafter	693
Total operating lease payments	16,961
Less: imputed interest	(1,603)
Total operating lease liabilities	$	15,358

Enterprise-Wide Information (Tables)

3 Months Ended

Mar. 31, 2023

Segment Reporting [Abstract]

Property, Plant and Equipment, Net of Accumulated Depreciation

The Company's property, plant and equipment, net of accumulated depreciation, were located in the following geographical areas (in thousands) as of March 31, 2023 and December 31, 2022:


	March 31, 2023		December 31, 2022
United States	$	3,870	$	5,725
Korea	2,440		2,706
Japan	619		644
Canada	—		157
Germany	88		110
Other	118		136
	$	7,135	$	9,478

Organization and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2022	Dec. 31, 2018
Significant Accounting Policies [Line Items]
Billed amount under agreement							$ 59,000
Amount of payments collected					$ 41,700
Accounts receivable recovered			$ 2,500
Allowance for doubtful accounts	$ 13,100
Cumulative adjustment to retained earnings	117,215	$ 126,411	131,907	$ 138,582	131,907
Accumulated deficit
Significant Accounting Policies [Line Items]
Cumulative adjustment to retained earnings	(152,487)	$ (94,986)	(86,999)	$ (128,670)	(86,999)
Line of Credit \| Second Amendment to Credit Agreement
Significant Accounting Policies [Line Items]
Debt obligations	23,700
Unamortized issuance costs	400
Payments due in the next 12 months	$ 1,300
Cumulative Effect, Period of Adoption, Adjustment
Significant Accounting Policies [Line Items]
Cumulative adjustment to retained earnings			(401)		(401)
Cumulative Effect, Period of Adoption, Adjustment \| Accumulated deficit
Significant Accounting Policies [Line Items]
Cumulative adjustment to retained earnings			$ (401)		$ (401)	$ 400
Customer Concentration Risk \| Sales Revenue, Net \| Customer One
Significant Accounting Policies [Line Items]
Concentration risk, percentage	13.00%	15.00%
Customer Concentration Risk \| Sales Revenue, Net \| Customer Two
Significant Accounting Policies [Line Items]
Concentration risk, percentage	16.00%	14.00%
Customer Concentration Risk \| Sales Revenue, Net \| Customer Three
Significant Accounting Policies [Line Items]
Concentration risk, percentage		13.00%
Geographic Concentration Risk \| Accounts receivable \| Foreign Countries
Significant Accounting Policies [Line Items]
Concentration risk, percentage	81.00%			81.00%

Organization and Summary of Significant Accounting Policies - Schedule of Revenues by Source (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Net revenue	$ 69,812	$ 71,990
Access Networking Infrastructure
Disaggregation Of Revenue [Line Items]
Net revenue	58,496	67,412
Cloud Software & Services
Disaggregation Of Revenue [Line Items]
Net revenue	$ 11,316	$ 4,578

Organization and Summary of Significant Accounting Policies - Schedule of Information Revenues by Geographical Concentration (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Net revenue	$ 69,812	$ 71,990
Americas
Disaggregation Of Revenue [Line Items]
Net revenue	24,975	22,924
Europe, Middle East, Africa
Disaggregation Of Revenue [Line Items]
Net revenue	18,406	16,393
Asia
Disaggregation Of Revenue [Line Items]
Net revenue	$ 26,431	$ 32,673

Organization and Summary of Significant Accounting Policies - Schedule of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 16,184	$ 17,735
Charged to expense, net of recoveries	(184)	(752)
Foreign currency exchange impact	87	(326)
Balance at end of period	16,087	17,058
Cumulative effect of ASC 326 adoption
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 0	$ 401

Organization and Summary of Significant Accounting Policies - Effects of Restatement, Unaudited Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 28,892	$ 34,347	$ 34,160
Restricted cash	1,975	3,969	6,343
Accounts receivable - trade, net	106,291	134,471
Other receivables	20,752	16,144
Inventories	97,311	94,288
Contract assets	605	576
Prepaid expenses and other current assets	10,408	7,410
Total current assets	266,234	291,205
Property, plant and equipment, net	7,135	9,478
Right-of-use assets from operating leases	11,971	12,606
Goodwill	12,594	12,594	6,145
Intangible assets, net	30,422	31,742
Other assets	17,013	15,536
Total assets	345,369	373,161
Current liabilities:
Accounts payable - trade	107,904	118,667
Short-term debt – bank, trade facilities and secured borrowings	16,746	9,706
Current portion of long-term debt, net	23,660	24,073
Contract liabilities	16,614	18,705
Operating lease liabilities	4,859	4,834
Accrued and other liabilities	27,645	25,562
Total current liabilities	197,428	201,547
Long-term debt, net of current portion	0	0
Contract liabilities - non-current	6,584	7,788
Operating lease liabilities - non-current	10,499	11,417
Pension liabilities	11,060	11,021
Other long-term liabilities	2,583	2,806
Total liabilities	228,154	234,579
Commitments and contingencies (Note 13)
Stockholders’ equity:
Common stock	31	30
Additional paid-in capital	276,282	271,884
Accumulated other comprehensive loss	(6,611)	(4,662)
Accumulated deficit	(152,487)	(128,670)
Total stockholders’ equity	117,215	138,582	$ 126,411	$ 131,907
Total liabilities and stockholders’ equity	345,369	373,161
Previously Reported
Current assets:
Cash and cash equivalents	28,892	34,347
Restricted cash	1,975	3,969
Accounts receivable - trade, net	141,029	153,780
Other receivables	21,518	16,144
Inventories	69,722	78,513
Contract assets	605	576
Prepaid expenses and other current assets	10,689	8,371
Total current assets	274,430	295,700
Property, plant and equipment, net	7,135	9,478
Right-of-use assets from operating leases	11,971	12,606
Goodwill	19,952	19,952
Intangible assets, net	30,422	31,742
Other assets	17,013	15,536
Total assets	360,923	385,014
Current liabilities:
Accounts payable - trade	107,904	121,225
Short-term debt – bank, trade facilities and secured borrowings	16,746	9,706
Current portion of long-term debt, net	23,660	24,073
Contract liabilities	19,476	21,777
Operating lease liabilities	4,859	4,834
Accrued and other liabilities	29,615	27,559
Total current liabilities	202,260	209,174
Long-term debt, net of current portion	0	0
Contract liabilities - non-current	6,636	7,864
Operating lease liabilities - non-current	10,499	11,417
Pension liabilities	11,060	11,021
Other long-term liabilities	2,583	2,806
Total liabilities	233,038	242,282
Stockholders’ equity:
Common stock	31	30
Additional paid-in capital	276,282	271,884
Accumulated other comprehensive loss	(6,462)	(4,351)
Accumulated deficit	(141,966)	(124,831)
Total stockholders’ equity	127,885	142,732
Total liabilities and stockholders’ equity	360,923	385,014
Revision of Prior Period, Adjustment
Current assets:
Cash and cash equivalents	0	0
Restricted cash	0	0
Accounts receivable - trade, net	(34,738)	(19,309)
Other receivables	(766)	0
Inventories	27,589	15,775
Contract assets	0	0
Prepaid expenses and other current assets	(281)	(961)
Total current assets	(8,196)	(4,495)
Property, plant and equipment, net	0	0
Right-of-use assets from operating leases	0	0
Goodwill	(7,358)	(7,358)
Intangible assets, net	0	0
Other assets	0	0
Total assets	(15,554)	(11,853)
Current liabilities:
Accounts payable - trade	0	(2,558)
Short-term debt – bank, trade facilities and secured borrowings	0	0
Current portion of long-term debt, net	0	0
Contract liabilities	(2,862)	(3,072)
Operating lease liabilities	0	0
Accrued and other liabilities	(1,970)	(1,997)
Total current liabilities	(4,832)	(7,627)
Long-term debt, net of current portion	0	0
Contract liabilities - non-current	(52)	(76)
Operating lease liabilities - non-current	0	0
Pension liabilities	0	0
Other long-term liabilities	0	0
Total liabilities	(4,884)	(7,703)
Stockholders’ equity:
Common stock	0	0
Additional paid-in capital	0	0
Accumulated other comprehensive loss	(149)	(311)
Accumulated deficit	(10,521)	(3,839)
Total stockholders’ equity	(10,670)	(4,150)
Total liabilities and stockholders’ equity	$ (15,554)	$ (11,853)

Organization and Summary of Significant Accounting Policies - Effects of Restatement, Unaudited Condensed Consolidated Statement of Comprehensive Loss (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

Mar. 31, 2023

Mar. 31, 2022

Error Corrections and Prior Period Adjustments Restatement [Line Items]

Net revenue

$ 69,812

$ 71,990

Cost of revenue

47,318

46,599

Gross profit

22,494

25,391

Operating expenses:

Research and product development

14,851

11,844

Selling, marketing, general and administrative

24,781

17,742

Restructuring and other charges

4,152

436

Amortization of intangible assets

1,271

294

Total operating expenses

45,055

30,316

Operating loss

(22,561)

(4,925)

Interest income

Interest expense

(127)

Interest expense, net

(792)

(90)

Other income (expense), net

728

(800)

Loss before income taxes

(22,625)

(5,815)

Income tax provision

1,192

1,771

Net loss

(23,817)

(7,586)

Foreign currency translation adjustments

^[1]

(1,889)

(268)

Actuarial loss

(60)

Comprehensive loss

$ (25,766)

$ (7,854)

Net loss per share

Basic (in dollars per share)

$ (0.77)

$ (0.28)

Diluted (in dollars per share)

$ (0.77)

$ (0.28)

Basic (in shares)

31,045,000

27,530,000

Diluted (in shares)

31,045,000

27,530,000

Previously Reported

Error Corrections and Prior Period Adjustments Restatement [Line Items]

Net revenue

$ 90,812

$ 77,040

Cost of revenue

60,985

50,215

Gross profit

29,827

26,825

Operating expenses:

Research and product development

14,851

11,844

Selling, marketing, general and administrative

24,781

17,742

Restructuring and other charges

4,152

436

Amortization of intangible assets

1,271

294

Total operating expenses

45,055

30,316

Operating loss

(15,228)

(3,491)

Interest income

Interest expense

(127)

Interest expense, net

(792)

Other income (expense), net

728

(800)

Loss before income taxes

(15,292)

(4,381)

Income tax provision

1,843

(1,333)

Net loss

(17,135)

(3,048)

Foreign currency translation adjustments

(2,051)

(268)

Actuarial loss

(60)

Comprehensive loss

$ (19,246)

$ (3,316)

Net loss per share

Basic (in dollars per share)

$ (0.55)

$ (0.11)

Diluted (in dollars per share)

$ (0.55)

$ (0.11)

Basic (in shares)

31,045,000

27,530,000

Diluted (in shares)

31,045,000

27,530,000

Revision of Prior Period, Adjustment

Error Corrections and Prior Period Adjustments Restatement [Line Items]

Net revenue

$ (21,000)

$ (5,050)

Cost of revenue

(13,667)

(3,616)

Gross profit

(7,333)

(1,434)

Operating expenses:

Research and product development

Selling, marketing, general and administrative

Restructuring and other charges

Amortization of intangible assets

Total operating expenses

Operating loss

(7,333)

(1,434)

Interest income

Interest expense

Interest expense, net

Other income (expense), net

Loss before income taxes

(7,333)

(1,434)

Income tax provision

(651)

3,104

Net loss

(6,682)

(4,538)

Foreign currency translation adjustments

162

Actuarial loss

Comprehensive loss

$ (6,520)

$ (4,538)

Net loss per share

Basic (in dollars per share)

$ (0.22)

$ (0.17)

Diluted (in dollars per share)

$ (0.22)

$ (0.17)

[1]	Includes net gain of $0.2 million and net loss of $0.4 million on intra-entity foreign currency transactions that are of a long-term investment nature for three months ended March 31, 2023 and 2022.

Organization and Summary of Significant Accounting Policies - Effects of Restatement, Unaudited Condensed Consolidated Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Cash flows from operating activities:
Net loss	$ (23,817)	$ (7,586)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,465	1,081
Amortization of deferred financing costs	60	0
Stock-based compensation	4,486	2,671
Provision for inventory write-down	1,086	705
Provision for credit losses, net of recoveries	(184)	(752)
Provision for sales returns	541	1,448
Provision for warranty expense	70	121
Unrealized loss on foreign currency transactions	1,396	874
Subsidiary dissolution	0	(68)
Loss on disposal of property, plant and equipment	40	0
Changes in operating assets and liabilities, excluding effects of acquisition:
Accounts receivable	26,466	6,418	$ 6,418
Other receivable	(7,449)	126	126
Inventories	(2,060)	(14,557)	(14,557)
Contract assets	(29)	1,261	1,261
Prepaid expenses and other assets	(3,818)	(4,557)	(4,557)
Accounts payable	(11,316)	1,586	1,586
Contract liabilities	(3,265)	(43)	(43)
Accrued and other liabilities	159	540	540
Net cash used in operating activities	(15,169)	(10,732)	(10,732)
Cash flows from investing activities:
Proceeds from disposal of property, plant and equipment and other assets	1,790	0
Purchases of property, plant and equipment	(775)	(1,317)	(1,317)
Net cash provided by (used in) investing activities	1,015	(1,317)	(1,317)
Cash flows from financing activities:
Repayments of long-term borrowings	(313)	0
Proceeds from short-term borrowings and line of credit, net	8,918	0
Proceeds from related party term loan	4,059	0
Repayments of related party term loan	(5,845)	0
Payments for debt issue costs	(122)	(178)
Proceeds from exercise of stock awards and employee stock plan purchases	(87)	156
Net cash provided by (used in) financing activities	6,610	(22)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	96	(903)
Net change in cash, cash equivalents and restricted cash	(7,448)	(12,974)
Cash, cash equivalents and restricted cash at beginning of period	38,464	53,639	53,639
Cash, cash equivalents and restricted cash at end of period	31,016	40,665	38,464
Previously Reported
Cash flows from operating activities:
Net loss	(17,135)	(3,048)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,465	1,081
Amortization of deferred financing costs	60
Stock-based compensation	4,486	2,671
Provision for inventory write-down	1,086	705
Provision for credit losses, net of recoveries	(184)	(752)
Provision for sales returns	541	1,448
Provision for warranty expense	70	121
Unrealized loss on foreign currency transactions	1,396	874
Subsidiary dissolution		(68)
Loss on disposal of property, plant and equipment	40
Changes in operating assets and liabilities, excluding effects of acquisition:
Accounts receivable	11,033		2,761
Other receivable	(5,511)		126
Inventories	7,051		(10,931)
Contract assets	(29)		1,261
Prepaid expenses and other assets	(3,138)		(7,577)
Accounts payable	(13,875)		1,586
Contract liabilities	(3,493)		(1,446)
Accrued and other liabilities	131		456
Net cash used in operating activities	(15,006)		(10,732)
Cash flows from investing activities:
Proceeds from disposal of property, plant and equipment and other assets	1,790
Purchases of property, plant and equipment	(775)		(1,317)
Net cash provided by (used in) investing activities	1,015		(1,317)
Cash flows from financing activities:
Repayments of long-term borrowings	(313)
Proceeds from short-term borrowings and line of credit, net	8,918
Proceeds from related party term loan	4,059
Repayments of related party term loan	(5,845)
Payments for debt issue costs	(122)	(178)
Proceeds from exercise of stock awards and employee stock plan purchases	(87)	156
Net cash provided by (used in) financing activities	6,610	(22)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(67)	(903)
Net change in cash, cash equivalents and restricted cash	(7,448)	(12,974)
Cash, cash equivalents and restricted cash at beginning of period	38,464	53,639	53,639
Cash, cash equivalents and restricted cash at end of period	31,016	40,665	38,464
Revision of Prior Period, Adjustment
Cash flows from operating activities:
Net loss	(6,682)	(4,538)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	0	0
Amortization of deferred financing costs	0
Stock-based compensation	0	0
Provision for inventory write-down	0	0
Provision for credit losses, net of recoveries	0	0
Provision for sales returns	0	0
Provision for warranty expense	0	0
Unrealized loss on foreign currency transactions	0	0
Subsidiary dissolution		0
Loss on disposal of property, plant and equipment	0
Changes in operating assets and liabilities, excluding effects of acquisition:
Accounts receivable	15,433		3,657
Other receivable	(1,938)		0
Inventories	(9,111)		(3,626)
Contract assets	0		0
Prepaid expenses and other assets	(680)		3,020
Accounts payable	2,559		0
Contract liabilities	228		1,403
Accrued and other liabilities	28		84
Net cash used in operating activities	(163)		0
Cash flows from investing activities:
Proceeds from disposal of property, plant and equipment and other assets	0
Purchases of property, plant and equipment	0		0
Net cash provided by (used in) investing activities	0		0
Cash flows from financing activities:
Repayments of long-term borrowings	0
Proceeds from short-term borrowings and line of credit, net	0
Proceeds from related party term loan	0
Repayments of related party term loan	0
Payments for debt issue costs	0	0
Proceeds from exercise of stock awards and employee stock plan purchases	0	0
Net cash provided by (used in) financing activities	0	0
Effect of exchange rate changes on cash, cash equivalents and restricted cash	163	0
Net change in cash, cash equivalents and restricted cash	0	0
Cash, cash equivalents and restricted cash at beginning of period	0	0	0
Cash, cash equivalents and restricted cash at end of period	$ 0	$ 0	$ 0

Business Combinations - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended
	May 27, 2022	Oct. 31, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Business Acquisition [Line Items]
Goodwill			$ 12,594	$ 12,594	$ 6,145
ASSIA
Business Acquisition [Line Items]
Purchase price	$ 25,000
Held back amount	$ 2,500
Term after close for release of holdback amount	13 months
Additional consideration paid		$ 1,350
Goodwill	$ 6,449
ASSIA \| Measurement Input, Discount Rate
Business Acquisition [Line Items]
Discount rate on intangible assets	23.00%

Business Combinations - Summary of Provisional Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	May 27, 2022	Mar. 31, 2022
Provisional allocation of purchase consideration
Goodwill	$ 12,594	$ 12,594		$ 6,145
ASSIA
Provisional allocation of purchase consideration
Cash and cash equivalents			$ 203
Accounts receivable			2,322
Other assets			407
Right-of-use assets			2,172
Property, plant and equipment			232
Intangible assets			30,200
Accounts payable			(75)
Contract liabilities (As Restated)			(12,192)
Operating lease liabilities			(2,612)
Accrued and other liabilities			(756)
Goodwill			6,449
Total purchase consideration			$ 26,350

Business Combinations - Schedule of Estimated Fair Value and Useful Lives of Identifiable Intangible Assets (Details) - ASSIA $ in Thousands	May 27, 2022 USD ($)
Business Acquisition [Line Items]
Estimated fair value	$ 30,200
Customer relationships
Business Acquisition [Line Items]
Estimated fair value	$ 18,600
Estimated useful life	15 years
Customer backlog
Business Acquisition [Line Items]
Estimated fair value	$ 5,100
Estimated useful life	10 years
Developed technology
Business Acquisition [Line Items]
Estimated fair value	$ 6,200
Developed technology \| Minimum
Business Acquisition [Line Items]
Estimated useful life	5 years
Developed technology \| Maximum
Business Acquisition [Line Items]
Estimated useful life	7 years
Tradenames
Business Acquisition [Line Items]
Estimated fair value	$ 300
Estimated useful life	10 years

Fair Value Measurement - Schedule of Reconciliation of Level 3 Contingent Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 1,156	$ 2,121
Net change in fair value	27	51
Balance at end of period	$ 1,183	$ 2,172

Cash, Cash Equivalents and Restricted Cash - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents	$ 28,892	$ 34,347	$ 34,160
Long term restricted cash	100	200
Outside U.S.
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents	14,100	13,600
Within U.S.
Cash And Cash Equivalents [Line Items]
Cash and cash equivalents	$ 16,800	$ 24,900

Balance Sheet Details - Schedule of Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Inventory Disclosure [Abstract]
Raw materials	$ 35,870	$ 37,354
Work in process	1,465	1,050
Finished goods	59,976	55,884
Total inventories	$ 97,311	$ 94,288

Balance Sheet Details - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Balance Sheet Details [Line Items]
Standard product warranty, term	1 year
Extended product warranty, term (up to)	5 years
Contract with customer, liability, revenue recognized	$ 8.5	$ 2.4
Contract cost deferred	0.5		$ 1.0
Amortization related to contract cost deferred	0.5	0.2
Deferred Costs	$ 26.3		$ 16.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Balance Sheet Details [Line Items]
Percentage of revenue expected to recognize	72.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Balance Sheet Details [Line Items]
Percentage of revenue expected to recognize	28.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period
Property, Plant and Equipment
Balance Sheet Details [Line Items]
Depreciation and amortization associated with property, plant and equipment	$ 1.2	$ 0.8

Balance Sheet Details - Schedule of Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Property, plant and equipment, net:
Property, plant and equipment, gross	$ 23,485	$ 30,622
Less: accumulated depreciation and amortization	(16,285)	(21,062)
Less: government grants	(65)	(82)
Total property, plant and equipment, net	7,135	9,478
Machinery and equipment
Property, plant and equipment, net:
Property, plant and equipment, gross	12,971	17,214
Leasehold improvements
Property, plant and equipment, net:
Property, plant and equipment, gross	2,440	5,683
Computers and software
Property, plant and equipment, net:
Property, plant and equipment, gross	4,608	4,713
Furniture and fixtures
Property, plant and equipment, net:
Property, plant and equipment, gross	2,108	1,748
Construction in progress and other
Property, plant and equipment, net:
Property, plant and equipment, gross	$ 1,358	$ 1,264

Balance Sheet Details - Summary of Product Warranty Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance at beginning of period	$ 1,896	$ 1,981
Charged to cost of revenue	70	121
Claims and settlements	(113)	(149)
Foreign currency exchange impact	21	(17)
Balance at end of period	$ 1,874	$ 1,936

Balance Sheet Details - Summary of Contract Assets and Contract Liabilities Related to Contracts with Customers (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Contract assets	$ 605	$ 576
Contract liabilities	$ 23,198	$ 26,493

Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Balance at beginning of period, gross			$ 13,597	$ 7,148
Accumulated impairment at beginning of period			$ (1,003)	$ (1,003)
Foreign currency exchange impact	$ 0	$ 0
Balance at end of period	12,594	6,145
Optelian and RIFT Acquisitions
Goodwill [Roll Forward]
Goodwill from acquisitions		$ 0
ASSIA
Goodwill [Roll Forward]
Goodwill from acquisitions	$ 0

Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 41,828	$ 41,827
Accumulated Amortization	(11,406)	(10,085)
Total	30,422	31,742
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,331	24,330
Accumulated Amortization	(5,451)	(4,759)
Total	18,880	19,571
Customer backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,100	5,100
Accumulated Amortization	(723)	(506)
Total	4,377	4,594
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,207	11,207
Accumulated Amortization	(4,822)	(4,463)
Total	6,385	6,744
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	890	890
Accumulated Amortization	(385)	(340)
Total	505	550
Tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	300	300
Accumulated Amortization	(25)	(17)
Total	$ 275	$ 283

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 1,271	$ 294

Goodwill and Intangible Assets - Future Amortization Expense of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2023	$ 3,962
2024	5,283
2025	5,278
2026	4,095
2027	3,143
Thereafter	8,661
Total	$ 30,422	$ 31,742

Debt - Schedule of Debt (Details) $ in Thousands, ₩ in Billions	Mar. 31, 2023 USD ($)	Mar. 30, 2023 USD ($)	Mar. 30, 2023 KRW (₩)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
JPMorgan Term Loan, long-term	$ 0			$ 0
JPMorgan Term Loan, current portion	23,660			24,073
Short-term debt and credit facilities	16,746			9,706
Total Debt	40,406			33,779
Sales and Purchases to and from Related Parties \| Investor
Debt Instrument [Line Items]
Industrial Bank of Korea Loan	3,827			5,706
Revolving Credit Agreement
Debt Instrument [Line Items]
JPMorgan Revolving Credit Facility				4,000
Industrial Bank of Korea Loan
Debt Instrument [Line Items]
Industrial Bank of Korea Loan	919	$ 900	₩ 1.2	0
Secured Debt \| Second Amendment to Credit Agreement
Debt Instrument [Line Items]
JPMorgan Term Loan, long-term	0			0
JPMorgan Term Loan, current portion	24,063			24,375
Unamortized debt issuance costs	(403)			(302)
Long-term debt, including current portion	23,660			$ 24,073
Line of Credit \| Second Amendment to Credit Agreement
Debt Instrument [Line Items]
Long-term debt, including current portion	23,700
Line of Credit \| Second Amendment to Credit Agreement \| Revolving Credit Agreement
Debt Instrument [Line Items]
JPMorgan Revolving Credit Facility	$ 12,000

Debt - Additional Information (Details) ₩ in Billions				1 Months Ended	3 Months Ended
Debt - Additional Information (Details) ₩ in Billions	May 08, 2023 USD ($) Rate	Feb. 15, 2023 USD ($) Rate	May 27, 2022 USD ($)	Oct. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)	Jun. 15, 2023 USD ($)	Mar. 31, 2023 KRW (₩)	Mar. 30, 2023 USD ($) customer	Mar. 30, 2023 KRW (₩) customer	Dec. 31, 2022 USD ($)	Oct. 31, 2022 KRW (₩)	Feb. 09, 2022 USD ($)
Line Of Credit Facility [Line Items]
Minimum EBITDA for the fiscal quarter ending March 31, 2023		$ (1,000,000)
Minimum EBITDA for the fiscal quarter ending June 30, 2023		$ 1
Leverage Ratio Exceeds 2.5
Line Of Credit Facility [Line Items]
Commitment fee percentage on unused capacity		0.40%
Accounts receivable
Line Of Credit Facility [Line Items]
Number of customers included in accounts receivable collateral \| customer								2	2
Second Amendment to Credit Agreement \| Line of Credit
Line Of Credit Facility [Line Items]
Credit facility, current borrowing capacity					$ 16,800,000
Maximum leverage ratio through September 30, 2023 \| Rate		250.00%
Minimum fixed charge coverage ratio until December 31, 2023 \| Rate		125.00%
Minimum required liquidity, fiscal quarter ending March 31, 2023		$ 30,000,000
Minimum required liquidity, fiscal quarter ending June 30, 2023 and September 30, 2023		35,000,000
Minimum required liquidity, any time until September 30, 2023		$ 20,000,000
Leverage ratio (in excess of) \| Rate		250.00%
Debt obligations					23,700,000
Unamortized issuance costs					400,000
Payments due in the next 12 months					1,300,000
Letters of credit issued					(1,200,000)
Portion of long term debt not in compliance with covenants					22,800,000					$ 23,100,000
Second Amendment to Credit Agreement \| Adjusted Term SOFR Rate \| Line of Credit \| Leverage Ratio Exceeds 2.5
Line Of Credit Facility [Line Items]
Margins for borrowings		4.00%
Second Amendment to Credit Agreement \| Prime Rate \| Line of Credit \| Leverage Ratio Exceeds 2.5
Line Of Credit Facility [Line Items]
Margins for borrowings		3.00%
November 2022 DNI Loan \| Investor \| Short-Term Debt
Line Of Credit Facility [Line Items]
Interest rate on related party loan				6.00%
Industrial Bank of Korea Loan				$ 5,000,000							₩ 7.2
February 2023 DNI Loan \| Inventories
Line Of Credit Facility [Line Items]
Collateral for related party loans					26,800,000		₩ 35.0
February 2023 DNI Loan \| Accounts receivable
Line Of Credit Facility [Line Items]
Collateral for related party loans					12,400,000		16.2
February 2023 DNI Loan \| Investor
Line Of Credit Facility [Line Items]
Industrial Bank of Korea Loan					$ 4,100,000
February 2023 DNI Loan \| Investor \| Short-Term Debt
Line Of Credit Facility [Line Items]
Interest rate on related party loan					7.00%
Industrial Bank of Korea Loan					$ 3,800,000		5.0
February 2023 DNI Loan \| Minimum \| Inventories
Line Of Credit Facility [Line Items]
Collateral for related party loans					7,700,000		₩ 10.0
Industrial Bank of Korea Loan
Line Of Credit Facility [Line Items]
Industrial Bank of Korea Loan					$ 919,000			$ 900,000	₩ 1.2	$ 0
Interest rate								6.30%	6.30%
Third Amendment to Credit Agreement \| Line of Credit \| Subsequent Event
Line Of Credit Facility [Line Items]
Minimum EBITDA for the fiscal quarter ending March 31, 2023	$ 1,000,000
Leverage ratio (in excess of) \| Rate	250.00%
Borrowing base decrease through June 30, 2023	$ 5,000,000
Additional borrowing base decrease after June 30, 2023	$ 5,000,000
Third Amendment to Credit Agreement \| Adjusted Term SOFR Rate \| Line of Credit \| Leverage Ratio Exceeds 2.5 \| Subsequent Event
Line Of Credit Facility [Line Items]
Margins for borrowings	4.50%
Third Amendment to Credit Agreement \| Prime Rate \| Line of Credit \| Leverage Ratio Exceeds 2.5 \| Subsequent Event
Line Of Credit Facility [Line Items]
Margins for borrowings	3.50%
JPMorgan Credit Facility \| Letter of Credit
Line Of Credit Facility [Line Items]
Maximum borrowing amount												$ 15,000,000.0
Revolving Credit Agreement
Line Of Credit Facility [Line Items]
Maximum borrowing amount			$ 30,000,000.0
Revolving Credit Agreement \| Third Amendment to Credit Agreement \| Line of Credit \| Subsequent Event \| Forecast
Line Of Credit Facility [Line Items]
Maximum borrowing amount						$ 25,000,000
Revolving Credit Agreement \| JPMorgan Credit Facility
Line Of Credit Facility [Line Items]
Maximum borrowing amount												30,000,000.0
Credit facility, current borrowing capacity												$ 10,000,000.0
Amendment to Credit Agreement
Line Of Credit Facility [Line Items]
Maximum permitted leverage ratio through September 30, 2022			3.00
Maximum permitted leverage ratio through September 30, 2023			2.50
Maximum permitted leverage ratio after September 30 2023			2.00
Minimum permitted fixed charge coverage ratio			1.25
Amendment to Credit Agreement \| Minimum
Line Of Credit Facility [Line Items]
Commitment fee percentage on unused capacity			0.25%
Amendment to Credit Agreement \| Maximum
Line Of Credit Facility [Line Items]
Commitment fee percentage on unused capacity			0.35%
Amendment to Credit Agreement \| Adjusted Term SOFR Rate \| Minimum
Line Of Credit Facility [Line Items]
Margins for borrowings			3.00%
Amendment to Credit Agreement \| Adjusted Term SOFR Rate \| Maximum
Line Of Credit Facility [Line Items]
Margins for borrowings			3.50%
Amendment to Credit Agreement \| Prime Rate \| Minimum
Line Of Credit Facility [Line Items]
Margins for borrowings			2.00%
Amendment to Credit Agreement \| Prime Rate \| Maximum
Line Of Credit Facility [Line Items]
Margins for borrowings			2.50%
Amendment to Credit Agreement \| Letter of Credit \| Minimum
Line Of Credit Facility [Line Items]
Commitment fee percentage			3.00%
Amendment to Credit Agreement \| Letter of Credit \| Maximum
Line Of Credit Facility [Line Items]
Commitment fee percentage			3.50%
Amendment to Credit Agreement \| Term Loan
Line Of Credit Facility [Line Items]
Maximum borrowing amount			$ 25,000,000.0

Debt - Schedule of Future Principal Maturities of Term Loan (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Debt Disclosure [Abstract]
Remainder of 2023	$ 938
2024	1,563
2025	1,875
2026	2,188
2027	17,499
Total	$ 24,063

Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent of match	8.30%
Defined benefit plan, accumulated benefit obligation	$ 11.1		$ 11.0
Periodic benefit costs	0.1	$ 0.1
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, insurance contract amount	2.5		$ 2.5
United States
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan expense	0.3	0.2
Korea
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan expense	$ 0.3	$ 0.3

Restructuring and Other Charges - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Seminole Restructuring
Restructuring Cost And Reserve [Line Items]
Estimated percentage of positions eliminated	66.67%
Restructuring costs	$ 3,500,000
Accelerated depreciation	400,000
Relocate Manufacturing Functions \| Gmbh and Optelian Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring and related costs	0	$ 400,000
Freight and Expedite Fees \| Seminole Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	1,000,000.0
Facility and Labor Costs \| Seminole Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	800,000
Employee Severance \| Seminole Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	300,000
Restructuring liability	600,000
Inventory Write-Off \| Seminole Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	500,000
Other Restructuring \| Seminole Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	500,000
Facility Impairment Costs \| Seminole Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	300,000
Software and Software Development Costs \| Seminole Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring costs	$ 400,000

Related Party Transactions - Additional Information (Details) $ in Thousands, ₩ in Billions	3 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2023 KRW (₩)	Dec. 31, 2022 USD ($)
Related Party Transaction [Line Items]
Operating lease liability	$ 15,358
Right-of-use assets from operating leases	11,971			$ 12,606
Investor \| February 2023 DNI Loan
Related Party Transaction [Line Items]
DNI related party loan	4,100
Investor \| February 2023 DNI Loan \| Short-Term Debt
Related Party Transaction [Line Items]
DNI related party loan	3,800		₩ 5.0
DASAN \| Receivables and Payables With Related Parties
Related Party Transaction [Line Items]
DNI related party loan	3,827
Account receivables	224
Other receivables	0
Accounts payable	895
Accrued and other liabilities	$ 212
DASAN \| Investor
Related Party Transaction [Line Items]
DNI related party loan				5,706
License fee as a percent of annual sales	0.40%		0.40%
Royalty expense	$ 200	$ 100
Account receivables				943
Other receivables				123
Accounts payable				1,019
Accrued and other liabilities				483
DNI
Related Party Transaction [Line Items]
Operating lease cost	100	$ 200
DNI \| Investor
Related Party Transaction [Line Items]
Operating lease liability	1,600			1,700
Right-of-use assets from operating leases	$ 1,600			$ 1,700
Guarantee fee, percent	0.90%
DZS, Inc \| Investor \| DASAN
Related Party Transaction [Line Items]
DNI direct ownership interest	29.20%		29.20%

Related Party Transactions - Indebtedness and Other Obligations Payment Guarantees (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Related Party Transaction [Line Items]
Amount Guaranteed	$ 7,490
Payment guarantee to Industrial Bank of Korea
Related Party Transaction [Line Items]
Amount Guaranteed	4,422
Payment guarantee to Shinhan Bank
Related Party Transaction [Line Items]
Amount Guaranteed	$ 3,068

Related Party Transactions - Sales and Purchases To and From Related Parties (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Related Party Transaction [Line Items]
Net revenue	$ 69,812	$ 71,990
DASAN \| Investor \| Sales and Purchases to and from Related Parties
Related Party Transaction [Line Items]
Cost of revenue	128	177
Other expenses	16	17
Net revenue	153	198
Selling, General and Administrative Expense	294	407
Interest Expense, Debt	$ 79	$ 0

Related Party Transactions - Balances of Receivables and Payables with Related Parties (Details) - DASAN - Receivables and Payables With Related Parties $ in Thousands	Mar. 31, 2023 USD ($)
Related Party Transaction [Line Items]
Account receivables	$ 224
Other receivables	0
Loans Payable	3,827
Accounts payable	895
Accrued and other liabilities	$ 212

Net Income (Loss) Per Share - Reconciliation of Basic and Diluted Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net loss (As Restated)	$ (23,817)	$ (7,586)
Weighted average number of shares outstanding:
Basic (in shares)	31,045,000	27,530,000
Effect of dilutive securities:
Stock options, restricted stock units and share awards (in shares)	0	0
Diluted (in shares)	31,045,000	27,530,000
Net income (loss) per share:
Basic (in dollar per share)	$ (0.77)	$ (0.28)
Diluted (in dollar per share)	$ (0.77)	$ (0.28)

Net Income (Loss) Per Share - Antidilutive Securities Excluded from Computation of Earning Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Outstanding stock options
Antidilutive Securities Excluded From Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of loss per share calculation (in shares)	563	939
Unvested restricted stock units
Antidilutive Securities Excluded From Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of loss per share calculation (in shares)	500	278

Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating lease expense	$ 1.0	$ 1.2

Leases - Maturity of Operating Lease Liabilities (Details) $ in Thousands	Mar. 31, 2023 USD ($)
Leases [Abstract]
Remainder of 2023	$ 4,209
2024	5,131
2025	3,575
2026	2,232
2027	1,121
Thereafter	693
Total operating lease payments	16,961
Less: imputed interest	(1,603)
Total operating lease liabilities	$ 15,358

Commitments and Contingencies - Additional Information (Details) $ in Thousands, ₨ in Millions		3 Months Ended
	Oct. 10, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2023 INR (₨)	Mar. 31, 2022 USD ($)	Mar. 31, 2022 INR (₨)	Mar. 31, 2023 USD ($)
Guarantee Obligations [Line Items]
Underpaid duties				$ 3,600	₨ 299.6
Loss Contingency, Damages Sought, Value	$ 24,750
Subsequent Event \| Forecast
Guarantee Obligations [Line Items]
Underpaid duties		$ 4,700	₨ 389.3
Performance Guarantee
Guarantee Obligations [Line Items]
Guarantor obligations						$ 15,600

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Income tax expense	$ 1,192	$ 1,771
Income (loss) before income taxes	(22,625)	$ (5,815)
Unrecognized tax benefits	$ 5,200

Enterprise-Wide Information - Property, Plant and Equipment, Net of Accumulated Depreciation (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 7,135	$ 9,478
United States
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	3,870	5,725
Korea
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	2,440	2,706
Japan
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	619	644
Canada
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	0	157
Germany
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	88	110
Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 118	$ 136

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