For the three months ended March 31, 2023, the decrease in ciforadenant costs of $0.3 million as compared to the three months ended March 31, 2022, primarily consisted of a decrease of $0.1 million in drug manufacturing costs, a decrease of $0.1 million in clinical trial expenses and a decrease of $0.1 million in other outside service costs.
For the three months ended March 31, 2023, the decrease in mupadolimab costs of $1.6 million as compared to the three months ended March 31, 2022, primarily consisted of a decrease of $0.8 million in clinical trial expenses, a decrease of $0.7 million in drug manufacturing costs and a decrease of $0.1 million in other outside service costs.
For the three months ended March 31, 2023, the increase in unallocated costs of $0.2 million as compared to the three months ended March 31, 2022, primarily consisted of an increase in other outside service costs.
General and Administrative Expense
For the three months ended March 31, 2023, the increase in general and administrative expenses of $0.3 million as compared to the three months ended March 31, 2022, primarily consisted of an increase in personnel and related costs.
Interest Income and Other Expense, net
For the three months ended March 31, 2023, the increase in interest income and other expense, net of $0.4 million as compared to the three months ended March 31, 2022, primarily consisted of an increase in interest income earned due to an increase in interest rates.
Sublease Income – Related Party
For the three months ended March 31, 2023, the decrease in sublease income of $0.1 million was due to the expiration of the building sublease agreement with Angel Pharmaceuticals in January 2023.
Loss from equity method investment
For the three months ended March 31, 2023, the increase in loss from equity method investment of $0.7 million as compared to the three months ended March 31, 2022, primarily consisted of an increase in our share of Angel Pharmaceutical’s loss for the three months ended March 31, 2023.
Liquidity and Capital Resources
As of March 31, 2023, we had cash, cash equivalents and marketable securities of $34.5 million, and an accumulated deficit of $315.6 million, compared to cash and cash equivalents and marketable securities of $42.3 million and an accumulated deficit of $307.7 million as of December 31, 2022. We have financed our operations primarily through the sale of common stock and the private placements of redeemable convertible preferred stock.
Since our inception and through March 31, 2023, we have funded our operations primarily through the sale and issuance of stock, including through our IPO in March 2016, in which we raised net proceeds of approximately $70.6 million, a follow-on offering of our common stock in March 2018, in which we raised net proceeds of approximately $64.9 million and a follow on offering in February 2021, in which we raised net proceeds of approximately $32.0 million, in each case net of underwriting discounts and commissions and offering expenses.
In March 2020, we entered into an open market sale agreement (the “2020 Sales Agreement”) with Jefferies LLC (“Jefferies”) to sell shares of our common stock, from time-to-time, with aggregate gross sales proceeds of up to $50,000,000, through an at-the-market equity offering program under which Jefferies will act as our sales agent. In November 2021, we entered into another Sale Agreement (“2021 Sales Agreement”) with Jefferies to sell shares of our common stock from time-to-time, with aggregate gross sales proceeds of up to $40,000,000.