Biggest changeThis increase was partially offset by higher forfeiture credits during the year ended December 31, 2023 as a result of our restructuring in 2023 compared to the year ended December 31, 2022. General and Administrative The following table summarizes our general and administrative expenses: Year Ended December 31, (In thousands) 2023 2022 Change Personnel $ 8,016 $ 6,028 $ 1,988 Professional and legal fees 5,534 4,319 1,215 Facility and support services 3,023 2,302 721 Other general and administrative 2,240 2,341 (101) Stock-based compensation 12,285 10,143 2,142 Bad debt 1,314 — 1,314 Total general and administrative expenses $ 32,412 $ 25,133 $ 7,279 Personnel and stock-based compensation The aggregate increase in personnel and stock-based compensation expenses during the year ended December 31, 2023 compared to the year ended December 31, 2022 was primarily due to an increase in costs associated with higher average headcount prior to our restructuring, compensation adjustments, and equity awards granted in 2023. 72 Table of Contents Professional and legal fees The increase in professional and legal fees, including accounting, investor relations and corporate communication costs, during the year ended December 31, 2023 compared to the year ended December 31, 2022 was primarily driven by an increase in patent and accounting related expenses. Facility and support services The increase in facility and support services, including general office expenses, information technology costs and other expenses, during the year ended December 31, 2023 compared to the year ended December 31, 2022 was primarily driven by an increase in rent expense due to leasing additional office and laboratory space during the year ended December 31, 2023, as well as an increase in information technology costs. Bad debt Bad debt expenses were related to our determination that amounts due to us as of December 31, 2023 pursuant to the asset purchase agreement with EPI Health are uncertain as a result of the bankruptcy filing by EPI Health, which was initiated in July 2023. Licensing The increase in licensing expenses during the year ended December 31, 2023 compared to the year ended December 31, 2022 was primarily driven by amounts payable to third parties during the year ended December 31, 2023 in connection with amounts earned under the Sun Pharma agreement and an increase in amounts payable to third parties in connection with amounts earned under the Lilly agreement. Revaluation of Contingent Consideration The fair value of our contingent consideration liability decreased during the year ended December 31, 2023 mainly due to the removal of estimated sales of zunsemetinib for moderate to severe rheumatoid arthritis, moderate to severe hidradenitis suppurativa and moderate to severe psoriatic arthritis, following our decision to discontinue further development of our MK2 inhibitor programs in immuno-inflammatory diseases .
Biggest changeBecause we in-licensed ATI-052 in 2024, there were no related expenses for the year ended December 31, 2023. Lepzacitinib The decrease in expenses for lepzacitinib during the year ended December 31, 2024 compared to the year ended December 31, 2023 was primarily due to lower costs associated with preclinical development activities and costs associated with a Phase 2b clinical trial in subjects with atopic dermatitis, which was initiated in May 2022 and was completed in January 2024. Zunsemetinib The decrease in expenses for zunsemetinib during the year ended December 31, 2024 compared to the year ended December 31, 2023 was primarily due to a decrease in costs associated with Phase 2 clinical development activities which were completed in 2023 as well as a decrease in product manufacturing costs. Personnel and stock-based compensation The decrease in personnel and stock-based compensation expenses during the year ended December 31, 2024 compared to the year ended December 31, 2023 was primarily due to lower headcount, lower termination benefits and higher forfeiture credits as a result of our restructuring that was announced in December 2023. 75 Table of Contents General and Administrative The following table summarizes our general and administrative expenses: Year Ended December 31, (In thousands) 2024 2023 Change Personnel $ 6,786 $ 8,016 $ (1,230) Professional and legal fees 4,508 5,534 (1,026) Facility and support services 2,234 3,023 (789) Other general and administrative 1,892 2,240 (348) Stock-based compensation 6,783 12,285 (5,502) Bad debt — 1,314 (1,314) Total general and administrative expenses $ 22,203 $ 32,412 $ (10,209) Personnel and stock-based compensation The aggregate decrease in personnel and stock-based compensation expenses during the year ended December 31, 2024 compared to the year ended December 31, 2023 was primarily due to lower headcount and higher forfeiture credits. Professional and legal fees The decrease in professional and legal fees, including accounting, investor relations and corporate communication costs, during the year ended December 31, 2024 compared to the year ended December 31, 2023 was primarily driven by a decrease in accounting related expenses, which were partially offset by an increase in business development expenses. Facility and support services The decrease in facility and support services, including general office expenses, information technology costs and other expenses, during the year ended December 31, 2024 compared to the year ended December 31, 2023 was primarily driven by a decrease in rent expense and information technology expenses. Bad debt Bad debt expenses were related to our determination that amounts due to us as of December 31, 2023 pursuant to the asset purchase agreement with EPI Health are uncertain as a result of the bankruptcy filing by EPI Health in July 2023.
We may not be able to generate revenue from these programs if, among other things, our clinical trials are not successful, the FDA does not approve our drug candidates currently in clinical trials when we expect, or at all, or we are not able to identify and consummate transactions with third-party partners to further develop, obtain marketing approval for and/or commercialize our drug candidates. Our primary uses of capital are, and we expect will continue to be, compensation and related expenses, research and development expenses, laboratory and related supplies, legal and other regulatory expenses, and administrative and overhead costs.
We may not be able to generate revenue from these programs if, among other things, our clinical trials are not successful, the FDA does not approve our product candidates currently in clinical trials when we expect, or at all, or we are not able to identify and consummate transactions with third-party partners to further develop, obtain marketing approval for and/or commercialize our product candidates. Our primary uses of capital are, and we expect will continue to be, compensation and related expenses, research and development expenses, laboratory and related supplies, legal and other regulatory expenses, and administrative and overhead costs.
In addition, the Sarbanes-Oxley Act of 2002, as well as rules adopted by the SEC and the Nasdaq Stock Market LLC, requires public companies to implement specified corporate governance practices that could increase our compliance costs. We believe our existing cash, cash equivalents and marketable securities are sufficient to fund our operating and capital expenditure requirements for a period greater than 12 months from the date of issuance of our consolidated financial statements that appear in Item 8 of this Annual Report on Form 10-K based on our current operating assumptions.
In addition, the Sarbanes-Oxley Act of 2002, as well as rules adopted by the SEC and the Nasdaq Stock Market LLC, requires public companies to implement specified corporate governance practices that could increase our compliance costs. We believe our existing cash, cash equivalents and marketable securities are sufficient to fund our operating and capital expenditure requirements for a period greater than 12 months from the date of issuance of our consolidated financial statements that appear in Item 8 of this Annual Report based on our current operating assumptions.
Prior to our acquisition of Confluence in August 2017, we did not generate any revenue. We have financed our operations over the last several years primarily through sales of our equity securities and incurring indebtedness in the form of loans from commercial lenders. We may engage in additional debt and equity financing transactions in order to raise funds.
Prior to our acquisition of Confluence, we did not generate any revenue. We have financed our operations over the last several years primarily through sales of our equity securities and incurring indebtedness in the form of loans from commercial lenders. We may engage in additional debt and equity financing transactions in order to raise funds.
Our funding requirements in the near term will depend on many factors, including: ● the number and development requirements of the drug candidates that we may pursue; ● the scope, progress, results and costs of preclinical development, laboratory testing and conducting preclinical and clinical trials for our drug candidates; ● the costs, timing and outcome of regulatory review of our drug candidates; ● the extent to which we in-license or acquire additional drug candidates and technologies; ● the costs and timing of preparing, filing and prosecuting patent applications, maintaining and enforcing our intellectual property rights and defending any intellectual property-related claims; ● our ability to identify and consummate transactions with third-party partners to further develop, obtain marketing approval for and/or commercialize our drug candidates; and ● our ability to earn revenue as a result of licenses to, or partnerships or other arrangements with, third parties. See “Risk Factors” for additional risks associated with our substantial capital requirements. 76 Table of Contents Leases We occupy space for our headquarters in Wayne, Pennsylvania under a lease agreement which has a term through February 2029.
Our funding requirements in the near term will depend on many factors, including: ● the number and development requirements of the product candidates that we may pursue; ● the scope, progress, results and costs of preclinical development, laboratory testing and conducting preclinical and clinical trials for our product candidates; ● the costs, timing and outcome of regulatory review of our product candidates; ● the extent to which we in-license or acquire additional product candidates and technologies; ● the costs and timing of preparing, filing and prosecuting patent applications, maintaining and enforcing our intellectual property rights and defending any intellectual property-related claims; ● our ability to identify and consummate transactions with third-party partners to further develop, obtain marketing approval for and/or commercialize our product candidates; and ● our ability to earn revenue as a result of licenses to, or partnerships or other arrangements with, third parties. See “Risk Factors” for additional risks associated with our substantial capital requirements. Leases We occupy space for our headquarters in Wayne, Pennsylvania under a lease agreement which has a term through February 2029.
We will require additional capital to develop our drug candidates and to support our discovery efforts. Additional funds may not be available on a timely basis, on commercially acceptable terms, or at all, and such funds, if raised, may not be sufficient to enable us to continue to implement our long-term business strategy.
We will require additional capital to develop our product candidates and to support our discovery efforts. Additional funds may not be available on a timely basis, on commercially acceptable terms, or at all, and such funds, if raised, may not be sufficient to enable us to continue to implement our long-term business strategy.
If we are unable to raise sufficient additional capital or generate revenue from transactions with potential third-party partners for the development and/or commercialization of our drug candidates, we may need to substantially curtail our planned operations. We may raise additional capital through the sale of equity or debt securities.
If we are unable to raise sufficient additional capital or generate revenue from transactions with potential third-party partners for the development and/or commercialization of our product candidates, we may need to substantially curtail our planned operations. We may raise additional capital through the sale of equity or debt securities.
These contracts generally provide for termination upon notice, and therefore we believe that our non-cancelable obligations under these agreements are not material. Segment Information We have two reportable segments, therapeutics and contract research. The therapeutics segment is focused on identifying and developing innovative therapies to address significant unmet needs for immuno-inflammatory diseases.
These contracts generally provide for termination upon notice, and therefore we believe that our non-cancelable obligations under these agreements are not material. 80 Table of Contents Segment Information We have two reportable segments, therapeutics and contract research. The therapeutics segment is focused on identifying and developing innovative therapies to address significant unmet needs for immuno-inflammatory diseases.
Our ability to raise additional capital may be adversely impacted by potential worsening global economic conditions caused by a variety of factors including geopolitical tensions, rising interest rates, and inflationary pressures.
Our ability to raise additional capital may be adversely impacted by potential worsening global economic conditions caused by a variety of factors including geopolitical tensions and inflationary pressures.
In addition, to the extent we are able to consummate transactions with potential third-party partners to further develop, obtain marketing approval for and/or commercialize our drug candidates, we may receive upfront payments, milestone payments or royalties from such arrangements that would increase our liquidity. As of December 31, 2023, we had cash, cash equivalents and marketable securities of $181.9 million.
In addition, to the extent we are able to consummate transactions with potential third-party partners to further develop, obtain marketing approval for and/or commercialize our product candidates, we may receive upfront payments, milestone payments or royalties from such arrangements that would increase our liquidity. As of December 31, 2024, we had cash, cash equivalents and marketable securities of $203.9 million.
In such an event, our stockholders’ ownership will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of a holder of our common stock. Because of the numerous risks and uncertainties associated with research and development of pharmaceutical drugs, we are unable to estimate the exact amount of our working capital requirements.
In such an event, our stockholders’ ownership will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of a holder of our common stock. 79 Table of Contents Because of the numerous risks and uncertainties associated with research and development of pharmaceutical product candidates, we are unable to estimate the exact amount of our working capital requirements.
Louis, Missouri under a sublease agreement which has a term through June 2029. Our aggregate remaining lease payment obligation for these two spaces was $4.6 million as of December 31, 2023. Agreement and Plan of Merger – Confluence Under the Confluence Agreement, we agreed to pay the former Confluence equity holders aggregate remaining contingent consideration of up to $75.0 million based upon the achievement of specified regulatory and commercial milestones set forth in the Confluence Agreement.
Louis, Missouri under a sublease agreement which has a term through May 2029. Our aggregate remaining lease payment obligation for these two spaces was $3.2 million as of December 31, 2024. Agreement and Plan of Merger with Confluence Under the Confluence Agreement, we agreed to pay the former Confluence equity holders aggregate remaining contingent consideration of up to $75.0 million based upon the achievement of specified regulatory and commercial milestones set forth in the Confluence Agreement.
Our future funding requirements will be heavily determined by the resources needed to support the development of our drug candidates. As a publicly traded company, we incur and will continue to incur significant legal, accounting and other similar expenses.
Our future funding requirements will be heavily determined by the resources needed to support the development of our product candidates, without taking into account any potential business development activities. As a publicly traded company, we incur and will continue to incur significant legal, accounting and other similar expenses.
Cash in excess of immediate requirements is invested in accordance with our investment policy, primarily with a view towards liquidity and capital preservation. We currently have no ongoing material financing commitments, such as lines of credit or guarantees, that are expected to affect our liquidity, other than our contingent obligations under the Confluence Agreement, which is summarized above under “Overview—Acquisition and License Agreements,” and our lease obligations. Equity Financing Sale of Common Stock under At-the-Market Facility In April 2023, we sold 3.4 million shares of our common stock for aggregate gross proceeds of $27.5 million, pursuant to a sales agreement with SVB Securities LLC and Cantor Fitzgerald & Co., as sales agents, dated February 23, 2023.
Cash in excess of immediate requirements is invested in accordance with our investment policy, primarily with a view towards liquidity and capital preservation. We currently have no ongoing material financing commitments, such as lines of credit or guarantees, that are expected to affect our liquidity, other than our contingent obligations under the Confluence Agreement, Biosion Agreement and CTTQ Agreement, which are summarized above under “Overview—Acquisition and License Agreements,” and our lease obligations. Equity Financing Private Placement In November 2024, we closed a private placement in which we sold 35.6 million shares of our common stock for aggregate gross proceeds of $80.0 million.
The decrease was driven by lower overall hours billed, partially due to an increased focus on internal development programs, which was offset by a higher average billing rate. Licensing Licensing revenue was $28.2 million and $25.1 million for the years ended December 31, 2023 and 2022, respectively.
The decrease was driven by lower overall hours billed, which was offset by a higher average billing rate. Licensing Licensing revenue was $16.2 million and $28.2 million for the years ended December 31, 2024 and 2023, respectively.
This increase was partially offset by both the upfront payment received under the Lilly agreement and the upfront payment received under the Pediatrix agreement during the year ended December 31, 2022. Cost and Expenses Cost of Revenue Cost of revenue was $3.4 million and $4.0 million for the years ended December 31, 2023 and 2022, respectively, and in each case related to providing laboratory services to our clients.
The decrease was primarily driven by the upfront payment received under the Sun Pharma agreement during the year ended December 31, 2023, partially offset by the achievement of higher milestones under license agreements during the year ended December 31, 2024. Cost and Expenses Cost of Revenue Cost of revenue was $2.8 million and $3.4 million for the years ended December 31, 2024 and 2023, respectively, and in each case related to providing laboratory services to our clients.
We paid selling commissions and other fees of $2.2 million in connection with the sale. Cash Flows Cash and cash equivalents were $39.9 million as of December 31, 2023 compared to $45.3 million as of December 31, 2022.
We paid selling commissions of $0.8 million in connection with the sale. 77 Table of Contents Cash Flows Cash and cash equivalents were $24.6 million as of December 31, 2024 compared to $39.9 million as of December 31, 2023.
We also had $142.0 million in short- and long-term marketable securities as of December 31, 2023 compared to $184.5 million as of December 31, 2022. The sources and uses of cash that contributed to the change in cash and cash equivalents were: Year Ended December 31, (In thousands) 2023 2022 Cash and cash equivalents beginning balance $ 45,277 $ 27,349 Net cash used in operating activities (78,325) (67,567) Net cash provided by investing activities 46,220 12,628 Net cash provided by financing activities 26,706 72,867 Cash and cash equivalents ending balance $ 39,878 $ 45,277 74 Table of Contents Operating Activities Cash flow related to operating activities was the result of: Year Ended December 31, (In thousands) 2023 2022 Net loss $ (88,481) $ (86,908) Non-cash adjustments to reconcile net loss to net cash used in operating activities 767 20,536 Change in accounts payable and accrued expenses 10,518 960 Change in accounts receivable 186 139 Change in prepaid expenses and other assets (1,315) (2,294) Net cash used in operating activities $ (78,325) $ (67,567) Net cash used in operating activities increased for the year ended December 31, 2023 compared to the year ended December 31, 2022 primarily as a result of higher net loss after adjusting for revaluation of contingent consideration.
We also had $179.3 million in short- and long-term marketable securities as of December 31, 2024 compared to $142.0 million as of December 31, 2023. The sources and uses of cash that contributed to the change in cash and cash equivalents were: Year Ended December 31, (In thousands) 2024 2023 Cash and cash equivalents beginning balance $ 39,878 $ 45,277 Net cash used in operating activities (20,075) (78,325) Net cash (used in) provided by investing activities (69,769) 46,220 Net cash provided by financing activities 74,536 26,706 Cash and cash equivalents ending balance $ 24,570 $ 39,878 Operating Activities Cash flow related to operating activities was the result of: Year Ended December 31, (In thousands) 2024 2023 Net loss $ (132,065) $ (88,481) Non-cash adjustments to reconcile net loss to net cash used in operating activities 101,068 767 Change in accounts receivable (20) 186 Change in prepaid expenses and other assets (4,855) (1,315) Change in accounts payable and accrued expenses (8,130) 10,518 Change in deferred income 23,927 — Net cash used in operating activities $ (20,075) $ (78,325) Net cash used in operating activities decreased for the year ended December 31, 2024 compared to the year ended December 31, 2023 primarily as a result of lower net losses after adjusting for non-cash items and proceeds from the royalty sale to OMERS.
The contract research segment earns revenue from the provision of laboratory services. Recently Issued Accounting Pronouncements In November 2023, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” This standard requires disclosure of significant segment expenses and other segment items by reportable segment.
We are currently assessing the impact of this ASU. In November 2023, the FASB issued ASU No. 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” This standard requires disclosure of significant segment expenses and other segment items by reportable segment.
In addition to the payments described above, if we sell, license or transfer any of the intellectual property acquired from Confluence pursuant to the Confluence Agreement to a third party, we will be obligated to pay the former Confluence equity holders a portion of any consideration received from such sale, license or transfer in specified circumstances. R&D Obligations We enter into contracts in the normal course of business with CROs, contract manufacturing organizations and other service providers for clinical trials, preclinical studies and testing, manufacturing and other services and products for operating purposes.
In addition to the payments described above, we have also agreed to pay a portion of any sublicense consideration received from the grant of any sublicense or similar rights under any of the rights or licenses granted to us under the Biosion Agreement. R&D Obligations We enter into contracts in the normal course of business with CROs, contract manufacturing organizations and other service providers for clinical trials, preclinical studies and testing, manufacturing and other services and products for operating purposes.
As a result, we recorded an impairment charge of $6.6 million, the full balance of the IPR&D intangible asset. Other Income, net Other income, net increased during the year ended December 31, 2023 compared to the year ended December 31, 2022 primarily due to higher interest income on investment portfolio balances. 73 Table of Contents Liquidity and Capital Resources Overview Since our inception, we have incurred net losses and negative cash flows from our operations.
Our impairment analysis resulted in a fair value of the IPR&D intangible asset which was less than the carrying value and as a result, we recorded an impairment charge for the full balance of the IPR&D intangible asset during the year ended December 31, 2023. Other Income Interest Income Interest income decreased during the year ended December 31, 2024 compared to the year ended December 31, 2023 primarily due to lower interest income on investment portfolio balances. Non-cash Royalty Income Non-cash royalty income includes income related to the proceeds from the sale of future royalties to OMERS, recognized under the “units-of-revenue” method. Liquidity and Capital Resources Overview Since our inception, we have incurred net losses and negative cash flows from our operations.
We are assessing the impact of this ASU and upon adoption expect that any impact would be limited to additional segment expense disclosures in the footnotes to the our consolidated financial statements. In December 2023, the FASB issued ASU No. 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” This standard enhances disclosures related to income taxes, including the rate reconciliation and information on income taxes paid.
We are currently assessing the impact of this ASU. In December 2023, the FASB issued ASU No. 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” This standard enhances disclosures related to income taxes, including the rate reconciliation and information on income taxes paid. This ASU becomes effective for annual periods beginning after December 15, 2024.
This was partially offset by lower discount rates resulting from lower risk-free rates and changes in credit spreads, as well as the passage of time. Investing Activities Cash flow related to investing activities was the result of: Year Ended December 31, (In thousands) 2023 2022 Purchases of property and equipment $ (1,309) $ (605) Purchases of marketable securities (135,675) (164,753) Proceeds from sales and maturities of marketable securities 183,204 177,986 Net cash provided by investing activities $ 46,220 $ 12,628 The change in net cash provided by investing activities for the year ended December 31, 2023 compared to the year ended December 31, 2022 primarily resulted from higher sales and maturities of marketable securities during the year ended December 31, 2023, and a reduction of purchases of marketable securities, which were higher during the year ended December 31, 2022. Financing Activities Cash flow related to financing activities was the result of: Year Ended December 31, (In thousands) 2023 2022 Proceeds from issuance of common stock under the at-the-market sales agreement, net of issuance costs $ 26,714 $ 72,744 Payments of employee withholding taxes related to restricted stock unit award vesting (102) (34) Proceeds from exercise of employee stock options and the issuance of stock 94 157 Net cash provided by financing activities $ 26,706 $ 72,867 75 Table of Contents Net cash provided by financing activities decreased for the year ended December 31, 2023 compared to December 31, 2022 primarily due to larger proceeds in 2022 from sales under our at-the-market sales agreement. Funding Requirements We anticipate we will incur net losses in the near term as we continue the development of our drug candidates and continue to discover and develop additional drug candidates.
The change was primarily 78 Table of Contents due to the consideration paid for the acquisition of in-licensed assets in connection with the Biosion Agreement and CTTQ Agreement and lower sales and maturities of marketable securities, partially offset by a reduction in purchases of marketable securities. Financing Activities Cash flow related to financing activities was the result of: Year Ended December 31, (In thousands) 2024 2023 Proceeds from issuance of common stock under securities purchase agreement, net of issuance costs $ 74,913 $ — Proceeds from issuance of common stock under the at-the-market sales agreement, net of issuance costs — 26,714 Payments of employee withholding taxes related to restricted stock unit award vesting and exercise of employee stock options (409) (102) Proceeds from exercise of employee stock options and the issuance of stock 32 94 Net cash provided by financing activities $ 74,536 $ 26,706 The increase in net cash provided by financing activities for the year ended December 31, 2024 compared to December 31, 2023 was primarily due to proceeds from our private placement in November 2024, offset by proceeds from sales under our at-the-market sales agreement in 2023. Funding Requirements We anticipate we will incur net losses in the near term as we continue the development of our product candidates and continue to discover and develop additional product candidates.
We paid selling commissions of $0.8 million in connection with the sale. In April 2022, we sold 4,838,709 shares of our common stock for aggregate gross proceeds of $75.0 million, pursuant to a sales agreement with SVB Securities LLC and Cantor Fitzgerald & Co., as sales agents, dated May 20, 2021.
We paid placement agent and other fees of $5.1 million in connection with the private placement. At-the-Market Facility In April 2023, we sold 3.4 million shares of our common stock for aggregate gross proceeds of $27.5 million, pursuant to a sales agreement with Leerink Partners LLC (formerly SVB Securities LLC) and Cantor Fitzgerald & Co., as sales agents, dated February 23, 2023.
This ASU becomes effective for annual periods beginning in 2024 and interim periods in 2025.
This ASU becomes effective for annual periods beginning after December 15, 2026 and interim reporting periods within annual reporting periods beginning after December 15, 2027.
Cost of revenue decreased during the year ended December 31, 2023 due to lower variable costs resulting from the decrease in hours billed, partially offset by an increase in fixed overhead costs, including personnel-related costs. Research and Development The following table summarizes our research and development expenses by drug candidate or, for unallocated expenses, by type: Year Ended December 31, (In thousands) 2023 2022 Change Zunsemetinib $ 36,461 $ 28,133 $ 8,328 ATI-1777 12,129 12,113 16 ATI-2138 12,143 7,704 4,439 ATI-2231 1,575 4,828 (3,253) Discovery 6,881 4,564 2,317 Other research and development 3,417 1,564 1,853 Personnel 18,977 15,162 3,815 Stock-based compensation 6,801 3,745 3,056 Total research and development expenses $ 98,384 $ 77,813 $ 20,571 Zunsemetinib The increase in expenses for zunsemetinib during the year ended December 31, 2023 compared to the year ended December 31, 2022 was primarily due to higher costs associated with drug candidate manufacturing and costs associated with clinical development activities for a Phase 2b trial in subjects with rheumatoid arthritis, which initiated in December 2021 and was completed in November 2023.
Cost of revenue decreased during the year ended December 31, 2024 due to lower variable costs resulting from a decrease in hours billed, which was offset by an increase in termination benefits as a result of our restructuring that was announced in December 2023. 74 Table of Contents Research and Development The following table summarizes our research and development expenses by product candidate or, for unallocated expenses, by type: Year Ended December 31, (In thousands) 2024 2023 Change Bosakitug $ 299 $ — $ 299 ATI-2138 4,209 12,143 (7,934) ATI-052 1,895 — 1,895 Lepzacitinib 1,300 12,129 (10,829) Zunsemetinib 4,496 36,461 (31,965) Discovery 5,775 6,881 (1,106) Other research and development 1,031 4,992 (3,961) Personnel 11,446 18,977 (7,531) Stock-based compensation 3,135 6,801 (3,666) Total research and development expenses $ 33,586 $ 98,384 $ (64,798) ATI-2138 The decrease in expenses for ATI-2138 during the year ended December 31, 2024 compared to the year ended December 31, 2023 was primarily due to a decrease in clinical development expenses associated with a Phase 1 MAD trial which was completed in September 2023, as well as a decrease in preclinical development activities.
The increase was partially offset by a decrease in costs associated with clinical development activities for a Phase 2a trial in subjects with hidradenitis suppurativa, which initiated in December 2021 and was completed in March 2023. 71 Table of Contents ATI-1777 ATI-1777 expenses were higher during the year ended December 31, 2023 compared to the year ended December 31, 2022 primarily due to an increase in costs associated with a Phase 2b clinical trial in subjects with atopic dermatitis, which initiated in May 2022 and was completed in December 2023.
This decrease was partially offset by clinical development expenses associated with a Phase 2a trial that was initiated in August 2024. ATI-052 Research and development expenses related to ATI-052 for the year ended December 31, 2024 primarily consisted of product candidate manufacturing costs and preclinical development activities.
This decrease was partially offset by lower discount rates resulting from lower risk-free rates and changes in credit spreads, as well as the passage of time. The fair value of our contingent consideration liability increased during the year ended December 31, 2022 mainly due to an increase in future sales level assumptions for zunsemetinib and the passage of time. Intangible Asset Impairment During the quarter ended December 31, 2023, we performed an impairment analysis on the IPR&D intangible asset due to our decision to discontinue further development of the drug candidate for immuno-inflammatory diseases.
During the quarter ended December 31, 2023, we performed an impairment analysis on the IPR&D intangible asset acquired from Confluence due to our decision to discontinue further development of the product candidate for immuno-inflammatory diseases.
Management’s Discussion and Analysis of Financial Condition and Results of Operations. Comparison of Years Ended December 31, 2023 and 2022 Year Ended December 31, (In thousands) 2023 2022 Change Revenues: Contract research $ 3,035 $ 4,395 $ (1,360) Licensing 28,214 25,100 3,114 Other — 257 (257) Total revenue 31,249 29,752 1,497 Costs and expenses: Cost of revenue 3,423 4,023 (600) Research and development 98,384 77,813 20,571 General and administrative 32,412 25,133 7,279 Licensing 14,658 7,937 6,721 Revaluation of contingent consideration (26,900) 4,700 (31,600) Intangible asset impairment 6,629 — 6,629 Total costs and expenses 128,606 119,606 9,000 Loss from operations (97,357) (89,854) (7,503) Other income, net 8,509 2,946 5,563 Loss before income taxes (88,848) (86,908) (1,940) Income tax benefit (367) — (367) Net loss $ (88,481) $ (86,908) $ (1,573) 70 Table of Contents Revenue Contract Research Contract research revenue was $3.0 million and $4.4 million for the years ended December 31, 2023 and 2022, respectively, and was comprised of fees earned from the provision of laboratory services to our clients.
We use an expected dividend yield of zero because we have not paid cash dividends to date and have no intention of paying cash dividends in the future. The fair value of each RSU is measured using the closing price of our common stock on the date of grant. 73 Table of Contents Results of Operations Comparison of Years Ended December 31, 2024 and 2023 Year Ended December 31, (In thousands) 2024 2023 Change Revenues: Contract research $ 2,541 $ 3,035 $ (494) Licensing 16,179 28,214 (12,035) Total revenue 18,720 31,249 (12,529) Costs and expenses: Cost of revenue 2,792 3,423 (631) Research and development 33,586 98,384 (64,798) General and administrative 22,203 32,412 (10,209) Licensing 12,666 14,658 (1,992) Revaluation of contingent consideration 2,500 (26,900) 29,400 In-process research and development 86,905 6,629 80,276 Total costs and expenses 160,652 128,606 32,046 Loss from operations (141,932) (97,357) (44,575) Other income: Interest income 7,953 8,509 (556) Non-cash royalty income 1,914 — 1,914 Total other income 9,867 8,509 1,358 Loss before income taxes (132,065) (88,848) (43,217) Income tax benefit — (367) 367 Net loss $ (132,065) $ (88,481) $ (43,584) Revenue Contract Research Contract research revenue was $2.5 million and $3.0 million for the years ended December 31, 2024 and 2023, respectively, and was comprised of fees earned from the provision of laboratory services to our clients.