Biggest changeThe increase was primarily due to an increase of $8.4 million in manufacturing costs related to the manufacture of clinical trial material for our ongoing clinical trials, an increase of $7.5 million as a result of an increase in headcount to expand our in-house research, manufacturing and clinical development capabilities, an increase of $4.3 million for facility and equipment expenses related to our increased lab space and related research activities, an increase of $3.2 million in clinical trial costs and an increase of $3.2 million in other operating expenses primarily related to fixed asset depreciation and impairment losses, offset by a decrease of $1.2 million in pharmacology costs.
Biggest changeThe decrease in research and development expense was primarily a result of a decrease in the cGMP manufacture of clinical trial material of $13.8 million and a decrease in materials consumed in our lab of $1.2 million, offset primarily by increases in costs associated with the conduct of clinical trials for SL-172154 of $4.2 million, depreciation of fixed assets of $1.0 million and facility costs of $0.8 million related to the expansion of our in-house manufacturing and development capabilities.
However, actual 58 costs and timing of clinical trials are highly uncertain, subject to risks and may change depending upon a number of factors, including our clinical development plan. We make estimates of our prepaid and accrued expenses as of each balance sheet date in our financial statements based on facts and circumstances known at that time.
However, actual costs and timing of clinical trials are highly uncertain, subject to risks and may change depending upon a number of factors, including our clinical development plan. We make estimates of our prepaid and accrued expenses as of each balance sheet date in our financial statements based on facts and circumstances known at that time.
We believe that data shared to date in human cancer patients have demonstrated that the unique protein engineering and physical properties of the ARC platform have led to a differentiated profile in terms of safety and on-target immune activation, demonstrated by unique pharmacodynamic findings, as compared to monoclonal or bispecific antibodies.
We believe that data shared to date in human cancer patients demonstrate that the unique protein engineering and physical properties of the ARC platform have led to a differentiated profile in terms of safety and on-target immune activation, demonstrated by unique pharmacodynamic findings, as compared to monoclonal or bispecific antibodies.
Specifically, as a smaller reporting company we may choose to present only the two most recent fiscal years of audited financial statements in our Annual Report on Form 10-K and, similar to emerging growth companies, smaller reporting companies have reduced disclosure obligations regarding executive compensation. 59
Specifically, as a smaller reporting company we may choose to present only the two most recent fiscal years of audited financial statements in our Annual Report on Form 10-K and, similar to emerging growth companies, smaller reporting companies have reduced disclosure obligations regarding executive compensation.
We believe that the assumptions and estimates associated with our most critical accounting policies are those relating to revenue, accrued research and development costs and stock-based compensation. Revenue Recognition We have and may continue to enter into collaboration agreements with other companies.
We believe that the assumptions and estimates associated with our most critical accounting policies are those relating to revenue, accrued research and development costs and stock-based compensation. 60 Revenue Recognition We have and may continue to enter into collaboration agreements with other companies.
The actual probability of success for our product candidates may be affected by a variety of factors including: • the safety and efficacy of our product candidates; • early clinical data for our product candidates; • investment in our clinical programs; • competition; • manufacturing capability; and • commercial viability.
The actual probability of success for our product candidates may be affected by a variety of factors including: • the safety and efficacy of our product candidates; • clinical data for our product candidates; • investment in our clinical programs; • competition; • manufacturing capability; and • commercial viability.
We evaluate the measure of progress each reporting period and, if necessary, adjust the measure of performance and related revenue recognition. We record amounts as accounts receivable when the right to consideration is deemed unconditional.
We evaluate the measure of progress each reporting period and, if necessary, adjust the measure of performance and related revenue recognition. 61 We record amounts as accounts receivable when the right to consideration is deemed unconditional.
We expect to continue to use cash in our operating activities 56 as we conduct our clinical trials and nonclinical studies, incur costs of manufacturing clinical trial and nonclinical study materials and continue process development activities to optimize our manufacturing processes.
We expect to continue to use cash in our operating activities as we conduct our clinical trials and nonclinical studies, incur costs of manufacturing clinical trial and nonclinical study materials and continue process development activities to optimize our manufacturing processes.
We will remain an emerging growth company until the earlier of (a) the last day of the fiscal year (i) following the fifth anniversary of the completion of our IPO, (ii) in which we have total annual gross revenues of at least $1.07 billion or (iii) in which we are deemed to be a “large accelerated filer” under the rules of the SEC, which means the market value of our common stock that is held by non-affiliates exceeds $700.0 million as of the prior June 30th, or (b) the date on which we have issued more than $1.0 billion in non-convertible debt during the prior three-year period.
We will remain an emerging growth company until the earlier of (a) the last day of the fiscal year 62 (i) following the fifth anniversary of the completion of our IPO, (ii) in which we have total annual gross revenues of at least $1.235 billion or (iii) in which we are deemed to be a “large accelerated filer” under the rules of the SEC, which means the market value of our common stock that is held by non-affiliates exceeds $700.0 million as of the prior June 30th, or (b) the date on which we have issued more than $1.0 billion in non-convertible debt during the prior three-year period.
See Note 8 to our audited financial statements included elsewhere in this Annual Report on Form 10-K for information concerning certain of the specific assumptions we used in applying the Black-Scholes and Monte Carlo option pricing models to determine the estimated fair value of our stock options granted during the year ended December 31, 2022.
See Note 8 to our audited financial statements included elsewhere in this Annual Report on Form 10-K for information concerning certain of the specific assumptions we used in applying the Black-Scholes and Monte Carlo option pricing models to determine the estimated fair value of our stock options granted during the year ended December 31, 2023.
Our NOLs and tax credit carryforwards will begin to expire in 2024. We have recorded a full valuation allowance against our deferred tax assets at each balance sheet date. Results of Operations Comparison of the Years Ended December 31, 2022 and 2021 The following table sets forth our results of operations for the years ended December 31, 2022 and 2021.
Our NOLs and tax credit carryforwards will begin to expire in 2024. We have recorded a full valuation allowance against our deferred tax assets at each balance sheet date. Results of Operations Comparison of the Years Ended December 31, 2023 and 2022 The following table sets forth our results of operations for the years ended December 31, 2023 and 2022.
We expect to continue to incur significant expenses and operating losses in the near term in connection with our ongoing activities, as we: • continue to advance the nonclinical and clinical development of our clinical-stage product candidate, SL-172154; • initiate nonclinical studies and clinical trials for additional product candidates that we may identify in the future; • manufacture sufficient quantities of bulk drug substance and drug product to support our ongoing and planned nonclinical studies and clinical trials; • continue our process development efforts for our current and future product candidates; • maintain our operational, financial, and management systems; • retain key personnel and infrastructure to support our clinical development, research and manufacturing efforts; • utilize our in-house process development and manufacturing capabilities; • continue to develop, perfect, and defend our intellectual property portfolio; and • incur additional legal, accounting, or other expenses in operating our business, including the additional costs associated with operating as a public company and expenses incurred in connection with ongoing and future litigation, if any.
We expect to continue to incur significant expenses and operating losses in the near term in connection with our ongoing activities, as we: • continue to advance the nonclinical and clinical development of our clinical-stage product candidate, SL-172154; • manufacture sufficient quantities of bulk drug substance and drug product to support our ongoing and planned nonclinical studies and clinical trials; • continue our process development efforts for our current and future product candidates, including scale up of our Phase 3 and commercial manufacturing process; • initiate nonclinical studies and clinical trials for additional product candidates that we may identify in the future; • maintain our operational, financial, and management systems; • retain key personnel and infrastructure to support our clinical development, research and manufacturing efforts; • utilize our in-house process development and manufacturing capabilities; • continue to develop, perfect, and defend our intellectual property portfolio; and • incur additional legal, accounting, or other expenses in operating our business, including the additional costs associated with operating as a public company and expenses incurred in connection with ongoing and future litigation, if any.
Other Income Other income consists of interest earned on our cash, cash equivalents and investments, which consists of amounts held in a money market fund and at various times in government and corporate obligations as well as investment fees and realized gain or losses on investments (if any). 54 Income Taxes Since our inception, we have not recorded any income tax benefits for the net operating losses, or NOLs, we have incurred or for our research and development tax credits, as we believe, based upon the weight of available evidence, that it is more likely than not that all of our NOLs and tax credits will not be realized.
Other Income Other income consists of interest earned on our cash, cash equivalents and investments, which consists of amounts held in a money market fund and at various times in government and corporate obligations as well as investment fees and realized gain or losses on investments (if any). 57 Income Taxes Since our inception, we have not recorded any income tax benefits for the NOLs we have incurred or for our research and development tax credits, as we believe, based upon the weight of available evidence, that it is more likely than not that all of our NOLs and tax credits will not be realized.
There can be no assurance that such funding may be available to us on acceptable terms, or at all, or that we will be able to commercialize our product candidates. In addition, we may not be profitable even if we commercialize any of our product candidates.
There can be no assurance that such funding may be available to us on acceptable terms, or at all, or that we will be able to commercialize our product candidates. In addition, we may not be profitable even if we commercialize one or more of our product candidates.
Critical Accounting Policies Our management’s discussion and analysis of our financial condition and results of operations are based on our financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America, or GAAP.
Critical Accounting Policies Our management’s discussion and analysis of our financial condition and results of operations are based on our financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).
Net Cash Provided by (Used in) Investing Activities During the year ended December 31, 2022, net cash provided by investing activities was $49.4 million of which $60.9 million represents the net change in investments and $11.5 million represents purchases of property and equipment, net of sales, primarily attributable to our continued efforts to bring certain process development, manufacturing and laboratory capabilities in-house.
During the year ended December 31, 2022, net cash provided by investing activities was $49.4 million, of which $60.9 million represents the net change in investments and $11.6 million was used to purchase property and equipment, primarily attributable to our continued efforts to bring certain process development, manufacturing and laboratory capabilities in-house.
During the year ended December 31, 2021, net cash provided by financing activities was $1.9 million and was from the exercise of stock options and purchases pursuant to our employee stock purchase plan. Contractual Obligations and Other Commitments See Note 6 and Note 7 to our financial statements found elsewhere in this Annual Report on Form 10-K for additional disclosures.
During the year ended December 31, 2022, net cash provided by financing activities was $0.2 million and was from the exercise of stock options and purchases pursuant to our employee stock purchase plan. Contractual Obligations and Other Commitments See Note 6 and Note 7 to our financial statements found elsewhere in this Annual Report on Form 10-K for additional disclosures.
Additionally, we anticipate that we will continue to incur significant costs associated with being a public company, including expenses related to services associated with maintaining compliance with the requirements of Nasdaq and the Securities and Exchange Commission, or SEC, insurance, and investor relations costs.
Additionally, we anticipate that we will continue to incur significant costs associated with being a public company, including expenses related to services associated with maintaining compliance with the requirements of Nasdaq and the SEC, insurance, and investor relations costs.
We anticipate incurring additional net losses and negative cash flows from operations in the near future until such time, if ever, that we can generate significant sales of our product candidates currently in development.
We anticipate continuing to incur additional net losses and negative cash flows from operations in the near future until such time, if ever, that we can generate significant sales of our product candidates currently in development.
We may continue to be a smaller reporting company if either (i) the market value of our stock held by non-affiliates is less than $250.0 million or (ii) our annual revenue is less than $100.0 million during the most recently completed fiscal year and the market value of our stock held by non-affiliates is less than $700.0 million.
We will continue to be a smaller reporting company so long as (i) the market value of our stock held by non-affiliates is less than $250.0 million or (ii) our annual revenue is less than $100.0 million during the most recently completed fiscal year and the market value of our stock held by non-affiliates is less than $700.0 million.
The Black-Scholes and Monte Carlo option-pricing models require the use of subjective assumptions that include the expected stock price volatility and, for options granted prior to our IPO, the fair value of the underlying common stock on the date of grant.
We use the Monte Carlo pricing model to estimate the fair value of options that have market-based conditions. The Black-Scholes and Monte Carlo option-pricing models require the use of subjective assumptions that include the expected stock price volatility and, for options granted prior to our IPO, the fair value of the underlying common stock on the date of grant.
We generally recognize revenue using a cost-based input method. We recognize collaboration revenue in an amount that reflects the consideration that we expect to receive in exchange for those goods or services when our customer or collaborator obtains control of promised goods or services.
We recognize collaboration revenue in an amount that reflects the consideration that we expect to receive in exchange for those goods or services when our customer or collaborator obtains control of promised goods or services.
While it is difficult for us to predict with certainty, we expect increasing year-over-year operating expense over the next several years in the event that we conduct additional nonclinical studies and clinical trials (beyond our currently planned clinical trials), including later-stage clinical trials, for our current and future product candidates, pursue regulatory approval of our product candidates, or advance our preclinical pipeline.
While it is difficult for us to predict with certainty, we expect increasing year-over-year operating expense over the next several years in the event that we conduct additional nonclinical studies and clinical trials, which may include a material expansion of our existing clinical trials or the initiation of planned, later-stage clinical trials for our current and/or future product candidates, pursue regulatory approval of our product candidates, or advance additional product candidates from our preclinical pipeline.
Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials, including increased demand for clinical trial material. We expect to incur significant research and development expenses throughout 2023.
Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials, including increased demand for clinical trial material.
We have funded our operations as of the filing date of this Annual Report on Form 10-K through the net proceeds from our IPO of approximately $213.5 million, the sale of redeemable convertible preferred stock for approximately $152.9 million, the issuance of convertible notes for approximately $10.5 million and payments received pursuant to our collaboration agreements for approximately $82.7 million.
We have funded our operations as of the filing date of this Annual Report on Form 10-K through the net proceeds from the sale of our common stock and pre-funded warrants for approximately $261.1 million, the sale of redeemable convertible preferred stock for approximately $152.9 million, the issuance of convertible notes for approximately $10.5 million and payments received pursuant to our collaboration agreements for approximately $84.2 million.
In July 2022, we entered into a sales agreement, or the Sales Agreement, with SVB Securities LLC, or the Sales Agent, pursuant to which we may offer and sell up to $75.0 million of shares of our common stock from time to time in the ATM Facility.
In July 2022, we entered into a sales agreement (the “Sales Agreement”), with SVB Securities LLC (the “Sales Agent”), pursuant to which we may offer and sell up to $75.0 million of shares of our common stock from time to time (the “ATM Facility”).
For the years ended December 31, 2022 and 2021, our net loss was $101.9 million and $45.0 million, respectively. We have not been profitable since inception, and as of December 31, 2022, we had an accumulated deficit of $219.0 million and $161.3 million in cash and cash equivalents and investments.
For the years ended December 31, 2023 and 2022, our net loss was $87.3 million and $101.9 million, respectively. We have not been profitable since inception, and as of December 31, 2023, we had an accumulated deficit of $306.3 million and $130.6 million in cash and cash equivalents and investments.
Global Economic Considerations In addition, the global macroeconomic environment is uncertain, and could be negatively affected by, among other things, increased U.S. trade tariffs and trade disputes with other countries, instability in the global capital and credit markets, supply chain weaknesses, and instability in the geopolitical environment, including as a result of the Russian invasion of Ukraine and other political tensions, and lingering effects of the COVID-19 pandemic.
Global Economic Considerations The global macroeconomic environment is uncertain, and could be negatively affected by, among other things, increased U.S. trade tariffs and trade disputes with other countries, instability in the global capital and credit markets, supply chain weaknesses, financial institution instability, instability in the geopolitical environment, and lingering effects of the COVID-19 pandemic.
As of December 31, 2022, there were no sales pursuant to the ATM Facility. 55 Capital Resources and Funding Requirements Our primary uses of cash and cash equivalents and investments are to fund our operations, which consist primarily of research and development expenditures related to our programs, product development costs, research expenses, administrative support, capital expenditures related to bringing in-house certain process development and manufacturing capabilities and working capital requirements.
Capital Resources and Funding Requirements Our primary uses of cash and cash equivalents and investments are to fund our operations, which consist primarily of research and development expenditures related to our programs, product development costs, research expenses, administrative support, capital expenditures related to bringing in-house certain process development and manufacturing capabilities, and working capital requirements.
The fair values of restricted stock units, or RSUs, are based on the fair value of the Company’s common stock on the date of the grant. We recognize compensation expense on a straight-line basis over the requisite service period, which is generally the vesting period of the award.
The fair values of restricted stock units, “RSUs”, are based on the fair value of the Company’s common stock on the date of the grant. We recognize compensation expense on a straight-line basis over the requisite service period, which is generally the vesting period of the award. We also grant stock options that vest upon achievement of certain market-based conditions.
We are also a “smaller reporting company” as defined under the Securities Exchange Act of 1934, as amended, or the Exchange Act.
We are also a “smaller reporting company” as defined under the Exchange Act.
Net Cash Provided by Financing Activities During the year ended December 31, 2022, net cash provided by financing activities was $0.2 million and was from the exercise of stock options and purchases pursuant to our employee stock purchase plan.
Net Cash Provided by Financing Activities During the year ended December 31, 2023, net cash provided by financing activities was $48.6 million and was from the sale of common stock and pre-funded warrants for net cash proceeds of $48.2 million and the exercise of stock options and purchases pursuant to our employee stock purchase plan of $0.5 million.
These expenses include: • expenses incurred to conduct our nonclinical studies and clinical trials; • costs of manufacturing nonclinical study and clinical trial materials, including the costs of raw materials required for manufacturing; • process development activities to optimize manufacturing processes; • employee-related expenses, including salaries, benefits, and stock-based compensation; • laboratory materials and supplies used to support our research activities; • fees paid to third parties who assist with research and development activities; • expenses relating to regulatory activities, including filing fees paid to regulatory agencies; and • allocated expenses for facility-related costs. 53 The following table summarizes our research and development expenses by product candidate: Year ended December 31, (in thousands) 2022 2021 SL-172154 $ 38,609 $ 15,708 Other pipeline compounds 17,373 24,835 Internal costs, including personnel related benefits, facilities, and depreciation 26,917 16,020 $ 82,899 $ 56,563 Research and development activities are central to our business model.
These expenses include: • expenses incurred to conduct our clinical trials, including SL-172154 and any potential product candidates we may advance in the future; • costs of manufacturing nonclinical study and clinical trial materials, including the costs of raw materials required for manufacturing; • process development activities to optimize manufacturing processes, including the development and validation of Phase 3 and commercial manufacturing processes and analytical methods; • expenses incurred to conduct our nonclinical studies, including research conducted on our wholly-owned compounds and those subject to the Ono Agreement; • employee-related expenses, including salaries, benefits, and stock-based compensation; • laboratory materials and supplies used to support our research activities; • fees paid to third parties who assist with research and development activities; • expenses relating to regulatory activities, including filing fees paid to regulatory agencies; and • allocated expenses for facility-related costs. 56 The following table summarizes our research and development expenses by product candidate: Year ended December 31, (in thousands) 2023 2022 SL-172154 $ 30,653 $ 38,609 Other pipeline compounds 16,261 17,373 Internal costs, including personnel related benefits, facilities, and depreciation 27,396 26,917 $ 74,310 $ 82,899 Research and development activities are central to our business model.
During the year ended December 31, 2021, net cash used in operating activities was $57.1 million and primarily reflected by our net loss of $45.0 million and a $22.0 million net change in our operating assets and liabilities, offset by noncash charges of $5.5 million in stock-based compensation and $4.4 million in depreciation expense and amortization of investments.
During the year ended December 31, 2022, net cash used in operating activities was $94.5 million and primarily reflected by our net loss of $101.9 million and a $4.5 million net change in our operating assets and liabilities, and was offset by noncash charges of $6.5 million in stock-based compensation, $4.7 million in depreciation expense, amortization of investments and non-cash operating lease expense, and $0.7 million in losses on sale of assets.
The Sales Agent is generally entitled to compensation at a commission equal to 3.0% of the aggregate gross sales price per share sold under the Sales Agreement.
The Sales Agent is generally entitled to compensation at a commission equal to 3.0% of the aggregate gross sales price per share sold under the Sales Agreement. As of February 29, 2024 there were no sales pursuant to the ATM Facility.
Liquidity and Capital Resources Since our inception, our primary sources of liquidity have been generated by sales of our preferred stock and common stock, including our IPO, and collaboration agreements. As of December 31, 2022, we had an accumulated deficit of $219.0 million and $161.3 million of cash and cash equivalents and investments.
Liquidity and Capital Resources Since our inception, our primary sources of liquidity have been generated by sales of our common stock, pre-funded warrants, convertible preferred stock, convertible notes, and collaboration agreements. As of December 31, 2023, we had an accumulated deficit of $306.3 million and $130.6 million of cash and cash equivalents and investments.
Upon the amendment of an existing agreement, we evaluate whether the amendment represents a modification to an existing contract that would be recorded through a cumulative catch-up to revenue, or a separate contract.
Upon the amendment of an existing agreement, we evaluate whether the amendment represents a modification to an existing contract that would be recorded through a cumulative catch-up to revenue, or a separate contract. If it is determined that it is a separate contract, we will evaluate the necessary revenue recognition through the five-step process described below.
Compounds derived from our proprietary Agonist Redirected Checkpoint, or ARC ® , platform simultaneously inhibit checkpoint molecules and activate costimulatory molecules with a single therapeutic. Our lead product candidate, SL-172154, is designed to simultaneously inhibit the CD47/SIRPα macrophage checkpoint interaction and activate the CD40 costimulatory receptor to induce an antitumor immune response.
Our lead product candidate, SL-172154, is designed to simultaneously inhibit the CD47/SIRPα macrophage checkpoint interaction and activate the CD40 costimulatory receptor to induce an antitumor immune response.
Longer-term, we are pursuing additional disease areas, including autoimmune diseases, where our dual-sided fusion protein platforms may provide advantages over current treatment modalities. 51 Overview of Operations Since our inception in 2016, we have devoted substantially all of our resources to conducting research and development activities, including undertaking nonclinical studies of our product candidates, conducting clinical trials of our most advanced product candidates, manufacturing our product candidates, developing and perfecting our intellectual property rights, organizing and staffing our company, business planning, and raising capital.
Overview of Operations Since our inception in 2016, we have devoted substantially all of our resources to conducting research and development activities, including undertaking nonclinical studies of our product candidates, conducting clinical trials of our most advanced product candidates, manufacturing our product candidates, developing and perfecting our intellectual property rights, organizing and staffing our company, business planning, and raising capital.
Cash Flows The following table shows a summary of our cash flows for the periods indicated: Year ended December 31, (in thousands) 2022 2021 Net cash used in operating activities $ (94,498) $ (57,116) Net cash provided by (used in) investing activities 49,438 (10,443) Net cash provided by financing activities 171 1,929 Net decrease in cash and cash equivalents $ (44,889) $ (65,630) Net Cash Used in Operating Activities During the year ended December 31, 2022, net cash used in operating activities was $94.5 million and primarily reflected by our net loss of $101.9 million and a $4.5 million net change in our operating assets and liabilities, offset by noncash charges of $6.5 million in stock-based compensation, $4.7 million in depreciation expense, amortization of investments and non-cash operating lease expense and $0.7 million in losses on sale of assets.
We believe that our cash and cash equivalents and investments as of December 31, 2023 are sufficient to fund projected operations into 2026. 59 Cash Flows The following table shows a summary of our cash flows for the periods indicated: Year ended December 31, (in thousands) 2023 2022 Net cash used in operating activities $ (81,228) $ (94,498) Net cash provided by investing activities 110,859 49,438 Net cash provided by financing activities 48,616 171 Net increase (decrease) in cash and cash equivalents $ 78,247 $ (44,889) Net Cash Used in Operating Activities During the year ended December 31, 2023, net cash used in operating activities was $81.2 million and primarily reflected our net loss of $87.3 million and $4.1 million net change in our operating assets and liabilities, and was offset by noncash charges of $6.9 million in stock-based compensation, $2.9 million in depreciation expense, amortization of investments and non-cash operating lease expense and $0.3 million in losses on sale of assets.
SL-172154 is in an ongoing Phase 1 clinical trial for the treatment of patients with ovarian cancer. W e are also evaluating SL-172154 in an ongoing Phase 1 clinical trial for the treatment of patients with certa in hematologic malignancies, including acute myeloid leukemia, or AML, and higher-risk myelodysplastic syndromes, or HR-MDS.
SL-172154 is in an ongoing Phase 1B clinical trial for the treatment of patients with ovarian cancer. W e are also evaluating SL-172154 in an ongoing Phase 1B clinical trial for the treatment of patients with certa in hematologic malignancies, including AML and HR-MDS. We believe our clinical development plan may provide both first-in-class and best-in-class development opportunities for SL-172154.
If it is determined that it is a separate contract, we will evaluate the necessary revenue recognition through the five-step process described below. 57 When we conclude that a contract should be accounted for as a combined performance obligation and recognized over time, we then determine the period over which revenue should be recognized and the method by which to measure revenue.
When we conclude that a contract should be accounted for as a combined performance obligation and recognized over time, we then determine the period over which revenue should be recognized and the method by which to measure revenue. We generally recognize revenue using a cost-based input method.
Operating Expense Research and Development Expense Our research and development expenses consist primarily of costs incurred in connection with the discovery and development of our current and potential future product candidates.
We continue to explore other potential collaborations and expect that collaboration revenue we may generate, if any, will fluctuate from period to period. Operating Expense Research and Development Expense Our research and development expenses consist primarily of costs incurred in connection with the discovery and development of our current and potential future product candidates.
This decrease is primarily attributable to the cessation of work with Takeda under the Collaboration Agreement, which was mutually terminated in the fourth quarter of 2021 and all remaining revenue was recognized at that time. In the second quarter of 2022, we executed a collaboration agreement with another third party.
The increase in collaboration revenue was primarily attributable to an increase in clinical activity associated with our clinical trial collaboration agreement with ImmunoGen. In the second quarter of 2022, we executed a collaboration agreement with another third party and completed the work in the fourth quarter of 2022 and have recognized all of the revenue associated with that agreement.
Year Ended December 31, Change (in thousands) 2022 2021 Dollar Percentage Collaboration revenue $ 652 $ 30,017 $ (29,365) (97.8) % Operating expenses: Research and development 82,899 56,563 26,336 46.6 % General and administrative 21,082 18,723 2,359 12.6 % Loss from operations (103,329) (45,269) (58,060) 128.3 % Other income 1,384 295 1,089 369.2 % Net loss $ (101,945) $ (44,974) $ (56,971) 126.7 % Collaboration Revenue Collaboration revenue decreased by $29.4 million, or (97.8)%, to $0.7 million for the year ended December 31, 2022 from $30.0 million for the year ended December 31, 2021.
Year Ended December 31, Change (in thousands) 2023 2022 Dollar Percentage Collaboration revenue $ 1,657 $ 652 $ 1,005 154.1 % Operating expenses: Research and development 74,310 82,899 (8,589) (10.4) % General and administrative 19,304 21,082 (1,778) (8.4) % Loss from operations (91,957) (103,329) 11,372 (11.0) % Other income 4,659 1,384 3,275 236.6 % Net loss $ (87,298) $ (101,945) $ 14,647 (14.4) % Collaboration Revenue Collaboration revenue increased by $1.0 million, or 154.1%, to $1.7 million for the year ended December 31, 2023 from $0.7 million for the year ended December 31, 2022.
We completed the work in the fourth quarter of 2022 and have recognized all of the revenue associated with that agreement. Research and Development Expense Research and development expenses increased by $26.3 million, or 46.6%, to $82.9 million for the year ended December 31, 2022 from $56.6 million for the year ended December 31, 2021.
Research and Development Expense Research and development expenses decreased by $8.6 million, or 10.4%, to $74.3 million for the year ended December 31, 2023 from $82.9 million for the year ended December 31, 2022.
General and Administrative Expense General and administrative expenses increased by $2.4 million, or 12.6%, to $21.1 million for the year ended December 31, 2022 from $18.7 million for the year ended December 31, 2021. The increase was primarily driven by a litigation settlement of $1.4 million and an increase of $0.6 million of costs associated with being a public company.
The decrease in general and administrative expenses was primarily a result of recognizing the litigation settlement of $1.4 million in 2022 and a $1.0 million decrease in company insurance costs, primarily related to directors and officers insurance, offset by an increase in stock-based compensation of $0.6 million.
Components of our Results of Operation Collaboration Revenue We have no products approved for commercial sale, and we have not generated any revenue from commercial product sales. Our total revenue to date has been generated from our Collaboration Agreement with Takeda, and a research agreement with another third-party pharmaceutical company that was initiated and completed in 2022.
At this time, we are unable to quantify the potential effects of this economic instability on our future operations. 55 Components of our Results of Operation Collaboration Revenue We have no products approved for commercial sale, and we have not generated any revenue from commercial product sales.
Such challenges have caused, and may continue to cause, recession fears, rising interest rates, foreign exchange volatility and inflationary pressures. At this time, we are unable to quantify the potential effects of this economic instability on our future operations. Collaboration Agreement - Takeda On August 8, 2017, we entered into the Collaboration Agreement with Takeda.
Such challenges have caused, and may continue to cause, recession fears, high interest rates, foreign exchange volatility and inflationary pressures.
Additionally, we have entered into the Clinical Trial Collaboration Agreement with ImmunoGen, under which we expect to recognize up to $2.0 million of revenue, beginning in 2023 and continuing into or through 2024. We continue to explore other potential collaborations and expect that collaboration revenue we may generate, if any, will fluctuate from period to period.
Our total revenue to date has been generated from our collaboration and research agreements with various third parties, Revenue recognized in 2023 was a result of a clinical trial collaboration agreement with ImmunoGen in which activities began in 2023 and will continue in 2024. We expect to recognize a total of $2 million of revenue under this collaboration agreement.