expenses also include costs to maintain our intellectual property portfolio. Historically we have expanded our patent prosecution activities and in some cases, we have filed patent applications for non-critical strategic purposes intended to prevent others from filing similar patent claims. We continue to closely monitor our patent applications in the United States, Europe and other countries with the advice of outside legal counsel to determine if they will continue to provide strategic benefits. In cases where we believe the benefit has been realized or it becomes unnecessary due to the issuance of other patents, or for other reasons that will not affect the strength of our intellectual property portfolio, we have and will continue to abandon these patent applications in order to reduce our costs of continued prosecution or maintenance.
Critical Accounting Policies
In Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” of our Annual Report on Form 10-K for the year ended December 31, 2022, which was filed with the SEC on April 11, 2023, which we refer to as the Annual Report, we included a discussion of the most critical accounting policies used in the preparation of our financial statements. There has been no material change in the policies and estimates used in the preparation of our financial statements since the filing of our Annual Report.
Results of Operations
Comparison of the three months ended March 31, 2023 and 2022
Revenues. For the three months ended March 31, 2023 and 2022, we recorded revenue in the amount of approximately $19,000 related to the amortization of unearned license fees.
R&D Expenses. We did not record any R&D expense in either period which reflects the shift in our business resulting from our partnering strategy.
G&A Expenses. For the three months ended March 31, 2023, our G&A expenses decreased by approximately $39,000, or 11%, to $324,000 from $363,000 for the same period in 2022. The changes in the G&A expenses are reflected in several areas. Decreases in personnel related (decrease of $1,000), stock option expense (decrease of $1,000), professional services (decrease of $22,000), insurance (decrease of $9,000), facility and related (decrease of $3,000) and information technology (decrease of $3,000). The majority of the decrease is attributable to the decision to drop certain patent renewals that had limited remaining life in an effort to conserve cash.
Net Loss. Our Statements of Operations reflects a net loss of $385,000 for the quarter ended March 31, 2023, versus a net loss of $424,000 for the quarter ended March 31, 2022.
Liquidity and Capital Resources
Overview
We have not commercialized any of our product candidates to date and have incurred significant losses since inception. In this light, we have primarily financed our operations through the issuance of equity or debt, including the sale of a series of convertible promissory notes through private placements with accredited investors, the March and August 2014 private placements of common stock with HLBT, the 2019 sale of $1,300,000 of the 2019 Notes, the October 2020 sale of $500,000 of the 2020 Notes and the June 2021 private placement of $1,980,000 of common stock and warrants with several institutional and accredited investors, including members of management and the board. We also saved additional cash outlays by entering into the ReGenTree joint venture in early 2015.
We had cash and cash equivalents of $101,557 at March 31, 2023. We believe that this is sufficient cash to fund our planned operations only into the second quarter of 2023. Management has concluded that substantial doubt of our ability to remain a going concern exists and, as such, the report of our independent registered public accounting firm regarding our financial statements for 2022 contains an explanatory paragraph regarding our ability to continue as a going concern based upon our history of operating losses and dependence on future financings in order to meet our planned operating activities. If we cannot immediately raise additional capital, we will need to curtail our operations, temporarily or permanently, at some point in the second quarter of 2023. Without significant new capital, we expect, among other matters, to be unable to (i) pay for directors and officers liability insurance for our management team and directors, who may then elect to resign from the Company for our failure to maintain such insurance or otherwise, (ii) pay fees necessary to maintain our intellectual property worldwide or (iii) continue to file reports with the U.S. Securities and Exchange Commission, which will eventually cause our Common Stock to be delisted from the OTCQB trading marketplace. Any of these outcomes will adversely