Biggest changeThese were offset by adjustments for non-cash items of $33.2 million (primarily consisting of stock-based compensation, depreciation and amortization and premiums and discounts on available sale-securities) and a $7.5 million net increase in operating assets and liabilities primarily driven by changes in accounts payable and accrued expenses partially offset by changes in prepaid expenses and other operating assets and liabilities.
Biggest changeThese were partially offset by a $17.2 million net decrease in other operating assets and liabilities primarily driven by changes in accounts receivable, accounts payable, accrued expenses, operating lease liabilities as well as adjustments for non-cash items of $53.3 million (primarily consisting of stock-based compensation, lease impairment charge, depreciation & amortization and premiums & discounts on available-sale-securities). 92 During the year ended December 31, 2023, operating activities used $102.8 million of cash, primarily resulting from our net loss of $147.0 million during the period and a $8.6 million decrease in deferred revenue under our collaboration agreements.
The timing and amount of our operating expenditures will depend largely on: • the initiation, progress, timing, costs and results of nonclinical studies and clinical trials for our product candidates or any future product candidates we may develop; • our ability to maintain our relationships with key collaborators; • the outcome, timing and cost of seeking and obtaining regulatory approvals from the FDA and comparable foreign regulatory authorities, including the potential for such authorities to require that we perform more nonclinical studies or clinical trials than those that we currently expect or change their requirements on studies that had previously been agreed to; • the cost to establish, maintain, expand, enforce and defend the scope of our intellectual property portfolio, including the amount and timing of any payments we may be required to make, or that we may receive, in connection with licensing, preparing, filing, prosecuting, defending and enforcing any patents or other intellectual property rights; • the effect of competing technological and market developments; • the costs of continuing to grow our business, including hiring key personnel and maintaining or acquiring operating space; • the degree of market acceptance of any approved product candidates, including product pricing, as well as product coverage and the adequacy of reimbursement by third-party payors; • the cost of acquiring, licensing or investing in additional businesses, products, product candidates and technologies; • the cost and timing of selecting, auditing and potentially validating a manufacturing site for commercial-scale manufacturing; • the cost of establishing sales, marketing and distribution capabilities for any product candidates for which we may receive regulatory approval and that we determine to commercialize; and • our need to implement additional internal systems and infrastructure, including financial and reporting systems.
The timing and amount of our operating expenditures will depend largely on: 93 • the initiation, progress, timing, costs and results of nonclinical studies and clinical trials for our product candidates or any future product candidates we may develop; • our ability to maintain our relationships with key collaborators; • the outcome, timing and cost of seeking and obtaining regulatory approvals from the FDA and comparable foreign regulatory authorities, including the potential for such authorities to require that we perform more nonclinical studies or clinical trials than those that we currently expect or change their requirements on studies that had previously been agreed to; • the cost to establish, maintain, expand, enforce and defend the scope of our intellectual property portfolio, including the amount and timing of any payments we may be required to make, or that we may receive, in connection with licensing, preparing, filing, prosecuting, defending and enforcing any patents or other intellectual property rights; • the effect of competing technological and market developments; • the costs of continuing to grow our business, including hiring key personnel and maintaining or acquiring operating space; • the degree of market acceptance of any approved product candidates, including product pricing, as well as product coverage and the adequacy of reimbursement by third-party payors; • the cost of acquiring, licensing or investing in additional businesses, products, product candidates and technologies; • the cost and timing of selecting, auditing and potentially validating a manufacturing site for commercial-scale manufacturing; • the cost of establishing sales, marketing and distribution capabilities for any product candidates for which we may receive regulatory approval and that we determine to commercialize; and • our need to implement additional internal systems and infrastructure, including financial and reporting systems.
This is due to the numerous risks and uncertainties associated with product development and commercialization, including the following: • the timing and progress of nonclinical and clinical development activities; • the number and scope of nonclinical and clinical programs we decide to pursue; • the ability to raise necessary additional funds; • the progress of the development efforts of parties with whom we may enter into collaboration arrangements; • our ability to maintain our current development program and to establish new ones; • our ability to establish new licensing or collaboration arrangements; • the successful initiation and completion of clinical trials with safety, tolerability and efficacy profiles that are satisfactory to the FDA or any comparable foreign regulatory authority; • the receipt and related terms of regulatory approvals from applicable regulatory authorities; • the availability of drug substance and drug product for use in production of our product candidates; • our ability to establish and maintain agreements with third-party manufacturers for clinical supply for our clinical trials and commercial manufacturing, if any of our product candidates are approved; • our ability to obtain and maintain patents, trade secret protection and regulatory exclusivity, both in the United States and internationally; • our ability to protect our rights in our intellectual property portfolio; • our ability to obtain and maintain third-party insurance coverage and adequate reimbursement; • the acceptance of our product candidates, if approved, by patients, the medical community and third-party payors; • the impact of competition with other products; 116 • the impact of any business interruptions to our operations, including the timing and enrollment of patients in our planned clinical trials, or to those of our manufacturers, suppliers, or other vendors resulting from a future pandemic or similar public health crisis; and • our ability to maintain a continued acceptable safety profile for our therapies following approval.
This is due to the numerous risks and uncertainties associated with product development and commercialization, including the following: • the timing and progress of nonclinical and clinical development activities; • the number and scope of nonclinical and clinical programs we decide to pursue; • the ability to raise necessary additional funds; • the progress of the development efforts of parties with whom we may enter into collaboration arrangements; • our ability to maintain our current development programs and to establish new ones; • our ability to establish new licensing or collaboration arrangements; • the successful initiation and completion of clinical trials with safety, tolerability and efficacy profiles that are satisfactory to the FDA or any comparable foreign regulatory authority; • the receipt and related terms of regulatory approvals from applicable regulatory authorities; • the availability of drug substance and drug product for use in production of our product candidates; • our ability to establish and maintain agreements with third-party manufacturers for clinical supply for our clinical trials and commercial manufacturing, if any of our product candidates are approved; • our ability to obtain and maintain patents, trade secret protection and regulatory exclusivity, both in the United States and internationally; • our ability to protect our rights in our intellectual property portfolio; • our ability to obtain and maintain third-party insurance coverage and adequate reimbursement; • the acceptance of our product candidates, if approved, by patients, the medical community and third-party payors; • the impact of competition with other products; • the impact of any business interruptions to our operations, including the timing and enrollment of patients in our planned clinical trials, or to those of our manufacturers, suppliers, or other vendors resulting from a future pandemic or similar public health crisis; and • our ability to maintain a continued acceptable safety profile for our therapies following approval.
Our future clinical development costs may vary significantly based on factors such as: • per patient trial costs; • the number of trials required for approval; • the number of sites included in the trials; • the countries in which the trials are conducted; • the length of time required to enroll eligible patients; • the number of patients that participate in the trials; • the number of doses that patients receive; • the drop-out or discontinuation rates of patients; • potential additional safety monitoring requested by regulatory agencies; • the duration of patient participation in the trials and follow-up; • the cost and timing of manufacturing our product candidates; • the phase of development of our product candidates; and • the efficacy and safety profile of our product candidates.
Our future clinical development costs may vary significantly based on factors such as: • per patient trial costs; • the number of trials required for approval; • the number of sites included in the trials; • the countries in which the trials are conducted; • the length of time required to enroll eligible patients; • the number of patients that participate in the trials; • the number of doses that patients receive; 87 • the drop-out or discontinuation rates of patients; • potential additional safety monitoring requested by regulatory agencies; • the duration of patient participation in the trials and follow-up; • the cost and timing of manufacturing our product candidates; • the phase of development of our product candidates; and • the efficacy and safety profile of our product candidates.
We expect that our expense and capital requirements will increase substantially in connection with our ongoing activities, particularly if and as we: • initiate and complete preclinical studies and clinical trials for current or future product candidates • prepare and submit Investigational New Drug applications, or INDs, with the U.S Food and Drug Administration, or FDA, for future product candidates; • develop and scale up our capabilities to support our ongoing preclinical activities and clinical trials for our product candidates and commercialization of any of our product candidates for which we may obtain marketing approval; • secure facilities to support continued growth in our research, development and commercialization efforts; • advance research and development related activities to expand our product pipeline; • expand and improve the capabilities of our Pegasus platform; • seek regulatory approval for our product candidates that successfully complete clinical development; • contract to manufacture our product candidates; • maintain, expand and protect our intellectual property portfolio; • hire additional staff, including clinical, scientific and management personnel; and • incur additional costs associated with continuing to operate as a public company.
We expect that our expense and capital requirements will increase substantially in connection with our ongoing activities, particularly if and as we: • initiate and complete preclinical studies and clinical trials for current or future product candidates; • prepare and submit Investigational New Drug applications, or INDs, with the U.S Food and Drug Administration, or FDA, for future product candidates; • develop and scale up our capabilities to support our ongoing preclinical activities and clinical trials for our product candidates and commercialization of any of our product candidates for which we may obtain marketing approval; • secure facilities to support continued growth in our research, development and commercialization efforts; • advance research and development related activities to expand our product pipeline; • expand and improve the capabilities of our drug discovery platform; • seek regulatory approval for our product candidates that successfully complete clinical development; • contract to manufacture our product candidates; • maintain, expand and protect our intellectual property portfolio; • hire additional staff, including clinical, scientific and management personnel; and • incur additional costs associated with continuing to operate as a public company.
We base our estimates on historical experience, known trends and events and various other factors that we believe are reasonable under the circumstances, the 122 results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. We evaluate our estimates and assumptions on an ongoing basis.
We base our estimates on historical experience, known trends and events and various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. We evaluate our estimates and assumptions on an ongoing basis.
This process involves reviewing open contracts and purchase orders, communicating with our applicable personnel to identify services that have been performed on our behalf and estimating the level of service performed 123 and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of actual costs.
This process involves reviewing open contracts and purchase orders, communicating with our applicable personnel to identify services that have been performed on our behalf and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of actual costs.
We only apply the five-step model to contracts when it is probable that the entity will collect consideration it is entitled to in exchange for the goods or services it transfers to the customer. When optional goods or services are offered, we assess the options to determine whether the options grant the customer a material right.
We only apply the five-step model to contracts when it is probable that the entity will collect consideration it is entitled to in exchange for the goods or services it transfers to the customer. 95 When optional goods or services are offered, we assess the options to determine whether the options grant the customer a material right.
We expect that our revenue for the next several years will be derived primarily from our current collaboration agreements and any additional collaborations that we may enter into in the future. To date, we have not received any royalties under any of the collaboration agreements.
We expect that our revenue for the next several years will be 85 derived primarily from our current collaboration agreements and any additional collaborations that we may enter into in the future. To date, we have not received any royalties under any of the collaboration agreements.
We base the expense recorded related to external research and development on our estimates of the services received and efforts expended pursuant to quotes and contracts with multiple CMOs and CROs that supply, conduct and manage nonclinical studies on our behalf.
We base the expense recorded related to external research and development on our estimates of the services received and efforts expended pursuant to quotes and contracts with multiple CMOs and CROs that supply, conduct and manage studies on our behalf.
We utilize this method due to lack of historical exercise data. The expected dividend yield is assumed to be zero as we have no current plans to pay any dividends on common stock. 124
We utilize this method due to lack of historical exercise data. The expected dividend yield is assumed to be zero as we have no current plans to pay any dividends on common stock.
Operating expenses Our operating expenses since inception have consisted solely of research and development expenses and general and administrative expenses. Research and development expenses Research and development expenses consist primarily of costs incurred in connection with the discovery and development of targeted protein degradation therapeutics.
Operating expenses Our operating expenses since inception have consisted primarily of research and development expenses and general and administrative expenses. Research and development expenses Research and development expenses consist primarily of costs incurred in connection with the discovery and development of targeted protein degradation therapeutics.
The $11.2 million increase was primarily due to a $8.8 million increase in personnel, stock-based compensation and occupancy costs due to increases in employee headcount in the general and administrative functions, and a $2.4 million increase in legal and professional services expenses to support our growth as a public company.
The $11.2 million increase was primarily due to a $8.8 million increase in personnel, stock-based compensation and occupancy costs due to increases in employee headcount in the general and administrative functions, and a $2.4 million increase in legal and professional services expenses to support our operations as a public company.
Future funding requirements We expect our expenses to increase substantially in connection with our ongoing activities, particularly as we advance the later-stage clinical development of our product candidates. In addition, we expect to incur additional costs associated with our growth as a public company.
Future funding requirements We expect our expenses to increase substantially in connection with our ongoing activities, particularly as we advance the later-stage clinical development of our product candidates. In addition, we expect to incur additional costs associated with operating as a public company.
The increase of $24.8 million was primarily due to an increase of $19.5 million in personnel, stock-based compensation and occupancy costs due to increases in employee headcount in the research and development functions, a $10.2 million increase in other research and development expenses primarily associated with increased work on preclinical programs, as well as a $3.2 million increase in expenses on our STAT3 program due to the continued progression of the associated Phase-1 clinical trial.
The increase of $24.8 million was primarily due to an increase of $19.5 million in personnel, stock-based compensation and occupancy costs due to increases in employee headcount in the research and development functions, a $9.9 million increase in other research and development expenses primarily associated with increased work on preclinical programs, as well as a $3.2 million increase in expenses on our STAT3 program due to the expenses associated with the Phase-1 clinical trial.
Cash Flow provided by (used in) Investing Activities During the year ended December 31, 2023, cash provided by investing activities was $139.9 million comprised of maturities of marketable securities of $363.5 million partially offset by purchases of marketable securities of $189.2 million and purchases of property and equipment of $34.4 million.
During the year ended December 31, 2023, cash provided by investing activities was $139.9 million comprised of maturities of marketable securities of $363.5 million partially offset by purchases of marketable securities of $189.2 million and purchases of property and equipment of $34.4 million.
Our commercial revenues, if any, will be derived from sales of products that we do not expect to be commercially available for many years, if ever. Accordingly, we will need to obtain substantial additional funds to achieve our business objectives.
Our commercial revenues, if any, will be derived from sales of products that we do not expect to be commercially available for many years, if at all. Accordingly, we will need to obtain substantial additional funds to achieve our business objectives.
Additionally with respect to Sanofi, on December 2, 2022, Sanofi provided the Company with written notice of its intention to advance the collaboration target 1 candidate, KT-474, into Phase 2 clinical trials for which the Company received milestone payments as further set forth in the Amended Sanofi Agreement.
The Amended Sanofi Agreement became effective on December 5, 2022. 86 Additionally with respect to Sanofi, on December 2, 2022, Sanofi provided the Company with written notice of its intention to advance the collaboration target 1 candidate, KT-474, into Phase 2 clinical trials for which the Company received milestone payments as further set forth in the Amended Sanofi Agreement.
Other Income (Expense) Interest and other income and expense, net Interest and other income and expense consists of interest earned on our invested cash balances and interest on our financing leases.
Other Income (Expense) Interest and other income and expense, net Interest and other income and expense consists of interest earned on our invested cash balances and interest expense related to our financing leases.
We also anticipate that we will incur increased accounting, audit, legal, regulatory, compliance and director and officer insurance costs as well as legal, investor and public relations expenses associated with our continued growth as a public company.
We also anticipate that we will incur increased accounting, audit, legal, regulatory, compliance and director and officer insurance costs as well as legal, investor and public relations expenses associated with being a public company.
These expenses include: • employee-related expenses, including salaries, related benefits and stock-based compensation expense, for employees engaged in research and development functions; • expenses incurred under agreements with organizations that support our platform program development; • contract manufacturing organizations, or CMOs, that are primarily engaged to provide drug substance and product for our preclinical research and development programs, nonclinical studies and other scientific development services; • the cost of acquiring and manufacturing nonclinical trial materials, including manufacturing registration and validation batches; • facilities, depreciation and other expenses, which include direct and allocated expenses for rent and maintenance of facilities and insurance; • costs related to compliance with quality and regulatory requirements; and • payments made under third-party licensing agreements.
These expenses include: • employee-related expenses, including salaries, related benefits and stock-based compensation expense, for employees engaged in research and development functions; • costs incurred under agreements with third parties, including contract research organizations, or CROs, and other third parties that conduct clinical trials and preclinical activities on our behalf; • contract manufacturing organizations, or CMOs, that are primarily engaged to provide drug substance and product for our preclinical research and development programs, nonclinical studies, clinical trials and other scientific development services; • the cost of acquiring and manufacturing clinical and nonclinical trial materials, including manufacturing registration and validation batches; • facilities, depreciation and other expenses, which include direct and allocated expenses for rent and maintenance of facilities and insurance; • costs related to compliance with quality and regulatory requirements; and • payments made under third-party licensing agreements.
See “—Liquidity and capital resources.” 113 Components of Our Results of Operations Revenue To date, we have not generated any revenue from product sales and do not expect to generate any revenue from the sale of products in the foreseeable future. Our only revenues have been derived from research collaboration arrangements with Vertex Pharmaceuticals Incorporated, or Vertex, and Sanofi.
Components of Our Results of Operations Revenue To date, we have not generated any revenue from product sales and do not expect to generate any revenue from the sale of products in the foreseeable future. Our only revenues have been derived from research collaboration arrangements with Vertex Pharmaceuticals Incorporated, or Vertex, and Sanofi.
We will be eligible to receive tiered royalties for each program on net sales ranging from the high single digits to high teens, subject to low-single digits upward adjustments in certain circumstances. As of December 31, 2023, we have achieved $55.0 million of milestones to date under the Sanofi Agreement related to certain IRAK4 clinical milestones.
We will further be eligible to receive tiered royalties on net sales ranging from the high single digits to high teens, subject to low-single digits upward adjustments in certain circumstances. As of December 31, 2024, we have achieved $55.0 million of milestones under the Sanofi Agreement related to certain IRAK4 clinical milestones.
We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our available capital resources sooner than we expect.
We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our available capital resources sooner than we expect. See “Liquidity and capital resources” below.
Results of Operations Comparison of years ended December 31, 2023 and 2022 The following table summarizes our results of operations for the years ended December 31, 2023 and 2022: Year ended December 31, Change 2023 2022 (in thousands) Collaboration Revenue $ 78,592 $ 46,826 $ 31,766 Operating expenses: Research and development 189,081 164,248 24,833 General and administrative 55,041 43,834 11,207 Total operating expenses 244,122 208,082 36,040 Loss from operations (165,530 ) (161,256 ) (4,274 ) Other income, net 18,568 6,448 12,120 Net loss $ (146,962 ) $ (154,808 ) $ 7,846 Collaboration revenue We recognize revenue under each of our collaboration agreements based on our pattern of performance related to the respective identified performance obligation, which is the period over which we will perform research services under each of the respective agreements.
The $19.2 million increase was primarily due to the increase in our investments balance as a result of 2024 financing activities as well as prevailing interest rates in the respective periods. 90 Results of Operations Comparison of years ended December 31, 2023 and 2022 The following table summarizes our results of operations for the years ended December 31, 2023 and 2022: Year ended December 31, Change 2023 2022 (in thousands) Collaboration Revenue $ 78,592 $ 46,826 $ 31,766 Operating expenses: Research and development 189,081 164,248 24,833 General and administrative 55,041 43,834 11,207 Total operating expenses 244,122 208,082 36,040 Loss from operations (165,530 ) (161,256 ) (4,274 ) Other income, net 18,568 6,448 12,120 Net loss $ (146,962 ) $ (154,808 ) $ 7,846 Collaboration revenue We recognize revenue under each of our collaboration agreements based on our pattern of performance related to the respective identified performance obligation, which is the period over which we will perform research services under each of the respective agreements.
In addition, Sanofi may terminate the agreement for convenience or for a material safety event upon advance prior written notice, and we may terminate the agreement with respect to any collaboration candidate if, following Sanofi’s assumption of responsibility for the development, commercialization or manufacturing of collaboration candidates with respect to a particular target, Sanofi ceases to exploit any collaboration candidates directed to such target for a specified period. 114 In consideration for the exclusive licenses granted to Sanofi under the Sanofi Agreement, Sanofi made an upfront payment of $150.0 million.
In addition, Sanofi may terminate the agreement for convenience or for a material safety event upon advance prior written notice, and we may terminate the agreement with respect to any collaboration candidate if, following Sanofi’s assumption of responsibility for the development, commercialization or manufacturing of collaboration candidates with respect to a particular target, Sanofi ceases to exploit any collaboration candidates directed to such target for a specified period.
The Amended Sanofi Agreement also specifies details around the timing and number of Phase 2 trials required under the terms of the collaboration. The Amended Sanofi Agreement became effective on December 5, 2022.
The Amended Sanofi Agreement also specifies details around the timing and number of Phase 2 trials required under the terms of the collaboration.
A change in the outcome of any of these variables with respect to the development of our product candidates could significantly change the costs and timing associated with the development of that product candidate. We may never succeed in obtaining regulatory approval for any of our product candidates.
A change in the outcome of any of these variables with respect to the development of our product candidates could significantly change the costs and timing associated with the development of that product candidate.
We agreed to pay Cowen a commission of up to 3.0% of the gross proceeds of any shares sold by Cowen under the Sales Agreement. There have been no shares of our common stock sold under the Sales Agreement as of December 31, 2023.
We agreed to pay Jefferies a commission of up to 3.0% of the gross proceeds of any shares sold by Jefferies under the Jefferies Sales Agreement. As of December 31, 2024, we have not sold any shares of common stock under the Jefferies Sales Agreement.
General and administrative expenses General and administrative expenses were $55.0 million for the year ended December 31, 2023, compared to $43.8 million for the year ended December 31, 2022.
General and administrative expenses General and administrative expenses were $63.5 million for the year ended December 31, 2024, compared to $55.0 million for the year ended December 31, 2023.
As of December 31, 2023 we had cash and cash equivalents and marketable securities of $436.3 million. 119 In October 2021, we entered into a sales agreement, or Sales Agreement, with Cowen and Company, LLC, or Cowen, pursuant to which we may offer and sell shares of our common stock having aggregate gross proceeds of up to $250.0 million from time to time in “at-the-market” offerings through Cowen, as our sales agent.
In October 2021, we entered into a sales agreement, or Cowen Sales Agreement, with Cowen, pursuant to which we were able to offer and sell shares of our common stock having aggregate gross proceeds of up to $250.0 million from time to time in “at-the-market” offerings through Cowen, as our sales agent.
Cash flows The following table summarizes our sources and uses of cash for each of the periods presented: Year Ended December 31, 2023 2022 2020 (in thousands) Cash used in operating activities $ (102,826 ) $ (153,085 ) $ (128,946 ) Cash provided by (used in) investing activities 139,886 20,519 (99,835 ) Cash provided by financing activities 4,192 152,999 250,280 Net increase in cash, cash equivalents and restricted cash $ 41,252 $ 20,433 $ 21,499 Cash Flow used in Operating Activities During the year ended December 31, 2023, operating activities used $102.8 million of cash, primarily resulting from our net loss of $147.0 million during the period and a $8.6 million decrease in deferred revenue under our collaboration agreements.
Cash flows The following table summarizes our sources and uses of cash for each of the periods presented: Year Ended December 31, 2024 2023 2022 (in thousands) Cash used in operating activities $ (194,501 ) $ (102,826 ) $ (153,085 ) Cash provided by (used in) investing activities (404,077 ) 139,886 20,519 Cash provided by financing activities 608,851 4,192 152,999 Net increase in cash, cash equivalents and restricted cash $ 10,273 $ 41,252 $ 20,433 Cash Flow used in Operating Activities During the year ended December 31, 2024, operating activities used $194.5 million of cash, primarily resulting from our net loss of $223.9 million during the period and a $41.1 million decrease in deferred revenue under our collaboration agreements.
To date, we have received gross proceeds of $1.45 billion from sales of our convertible preferred stock, the sale of common stock including our August 2020 initial public offering, or IPO, and concurrent private placement, our July 2021 follow-on offering and concurrent private placement, our August 2022 112 private investment in public equity, or PIPE, offering, January 2024 follow-on offering, our sales agreement with Cowen and Company, LLC., and through our corporate collaborations.
To date, we have received gross proceeds of $1.71 billion from sales of our convertible preferred stock, the sale of common stock including our August 2020 initial public offering, or IPO, and concurrent private placement, our follow-on offerings and private placement offering, our prior sales agreement with Cowen, and through our corporate collaborations.
Equity-Based Compensation Expense We measure equity-based awards granted to employees, directors, and nonemployees based on their fair value on the date of the grant and recognize compensation expense for those awards over the requisite service period, which is generally the vesting period of the respective award.
To date, there have not been any material adjustments to our prior estimates of accrued research and development expenses. 96 Equity-Based Compensation Expense We measure equity-based awards granted to employees, directors, and nonemployees based on their fair value on the date of the grant and recognize compensation expense for those awards over the requisite service period, which is generally the vesting period of the respective award.
During the year ended December 31, 2021, cash used in investing activities was $99.8 million comprised of purchases of marketable securities of $456.4 million and purchases of property and equipment of $1.6 million offset by maturities of marketable securities of $358.2 million. 120 Cash Flow from Financing Activities During the year ended December 31, 2023, net cash provided by financing activities was $4.2 million, primarily consisting of $2.9 million in proceeds from the exercise of employee stock options, $1.4 million in proceeds from the issuance of shares under our employee stock purchase partially offset by finance lease payments of $0.1 million.
During the year ended December 31, 2023, net cash provided by financing activities was $4.2 million, primarily consisting of $2.9 million in proceeds from the exercise of employee stock options, $1.4 million in proceeds from the issuance of shares under our employee stock purchase partially offset by finance lease payments of $0.1 million.
These increases were primarily offset by a $8.0 million reduction in direct expenses related to our activities for our IRAK4, IRAKIMiD and MDM2 programs due to changes in the stage of development of these respective programs.
These increases were primarily offset by a $7.7 million reduction in direct expenses related to our activities for our IRAK4 and MDM2 programs due to changes in the stage of development of these respective programs. 91 General and administrative expenses General and administrative expenses were $55.0 million for the year ended December 31, 2023, compared to $43.8 million for the year ended December 31, 2022.
If we are unable to raise additional funds through equity or debt financings or other arrangements when needed, we may be required to delay, reduce or eliminate our product development or future commercialization efforts, or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.
If we are unable to raise additional funds through equity or debt financings or other arrangements when needed, we may be required to delay, reduce or eliminate our product development or future commercialization efforts, or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves. 94 Contractual Obligations and Other Commitments We have entered into arrangements that contractually obligate us to make payments that will affect our liquidity and cash flows in future periods.
As of December 31, 2023, we had cash, cash equivalents and marketable securities of $436.3 million.
As of December 31, 2024, we had cash and cash equivalents and marketable securities of $850.9 million.
We expect that our research and development expenses will increase substantially in connection with our planned clinical development activities 115 in the near term and in the future. At this time, we cannot accurately estimate or know the nature, timing and costs of the efforts that will be necessary to complete the clinical development of any future product candidates.
At this time, we cannot accurately estimate or know the nature, timing and costs of the efforts that will be necessary to complete the clinical development of any future product candidates.
We have based this estimate on assumptions that may prove to be wrong, and we could exhaust our available capital resources sooner than we expect. We expect that we will require additional funding to continue the clinical development of our clinical programs, commercialize our product candidates if we receive regulatory approval, and pursue in-licenses or acquisitions of other product candidates.
We expect that we will require additional funding to continue the clinical development of our clinical programs, commercialize our product candidates if we receive regulatory approval, and pursue in-licenses or acquisitions of other product candidates.
General and administrative expenses General and administrative expenses consist primarily of salaries and related costs for personnel in executive, finance, legal, corporate and business development, and administrative functions.
We may never succeed in obtaining regulatory approval for any of our product candidates. 88 General and administrative expenses General and administrative expenses consist primarily of salaries and related costs for personnel in executive, finance, legal, corporate and business development, and administrative functions.
For additional information on our leases and timing of future payments, please read Note 7, Leases, to the consolidated financial statements included in this Annual Report on Form 10-K.
As of December 31, 2024, our contractual commitments for our leases were $124.9 million, which will be paid over the term of such leases. For additional information on our leases and timing of future payments, please read Note 7, Leases, to the consolidated financial statements included in this Annual Report on Form 10-K.
To date, we have received gross proceeds of $1.45 billion from sales of our convertible preferred stock, the sale of common stock including our August 2020 IPO and concurrent private placement, our July 2021 follow-on offering and concurrent private placement, our August 2022 PIPE offering, January 2024 follow-on offering, our sales agreement with Cowen and Company, LLC., and through our corporate collaborations.
To date, we have received gross proceeds of $1.71 billion from sales of our convertible preferred stock, the sale of common stock including our August 2020 initial public offering, or IPO, and concurrent private placement, our subsequent follow-on offerings and private placement offering, our prior sales agreement with Cowen and through our corporate collaborations. 84 We have incurred significant operating losses since inception.
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.
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. We expect that our research and development expenses will increase substantially in connection with our planned clinical development activities in the near term and in the future.
The increase of $27.2 million was primarily due to an increase of $22.4 million related to IND-enabling studies for our MDM2 program and increased investment in our other pipeline programs and platform, as well an additional $22.0 million increase in personnel, stock-based compensation and occupancy costs due to increases in employee headcount in the research and development functions.
The increase of $51.2 million was primarily due to an increase of $58.4 million in costs related to our STAT6, TYK2 and MDM2 programs, as well as an increase of $21.1 million in personnel, stock-based compensation and occupancy costs due to increases in employee headcount in our research and development functions.
The $7.5 million increase was primarily due to a $6.5 million increase in G&A employee compensation due to an increase in employee headcount, and a $1.0M increase in legal and professional services expenses to support our growth as a public company.
The $8.5 million increase was primarily due to a $7.0 million increase in personnel, stock-based compensation and occupancy costs due to increases in employee headcount in the general and administrative functions, and a $1.5 million increase in legal and professional services expenses to support our operations as a public company.
With respect to our IRAK4 program, we are collaborating with Sanofi S.A, or Sanofi, on the development of drug candidates targeting IRAK4 outside the oncology and immuno-oncology fields.
Our lead molecule in our TYK2 program is KT-295, which we anticipate will enter the clinic in the second quarter of 2025. We are collaborating with Sanofi S.A., or Sanofi, on the development of drug candidates targeting IRAK4, including KT-474/SAR444656, outside of oncology and immuno-oncology fields.
We will be eligible to receive certain commercial milestone payments up to $700.0 million in the aggregate, of which $400.0 million relates to the IRAK4 program, which are payable upon the achievement of certain net sales thresholds.
Of these milestones, we remain eligible to receive up to $1.0 billion in development milestones upon the achievement of certain developmental or regulatory events, and up to $400.0 million in commercial milestones which are payable upon the achievement of certain net sales thresholds, all of which are related to the IRAK4 program.
The increase in revenue is primarily attributable to the achievement of $55 million in milestones under the Sanofi agreement in the fourth quarter of 2023. 117 Research and development expenses The following table summarizes our research and development expenses for each period presented (program expenses are not disclosed prior to formal development candidate nomination): Year ended December 31, Change 2023 2022 (in thousands) External research and development costs: IRAK4 $ 13,762 $ 17,850 $ (4,088 ) IRAKIMiD 4,641 4,914 (273 ) STAT3 11,490 8,332 3,158 MDM2 8,170 11,823 (3,653 ) Other 56,637 46,474 10,163 Internal research and development costs 94,381 74,855 19,526 Total research and development expenses $ 189,081 $ 164,248 $ 24,833 Research and development expenses were $189.1 million for the year ended December 31, 2023, compared to $164.2 million for the year ended December 31, 2022.
Research and development expenses The following table summarizes our research and development expenses for each period presented (program expenses are not separately included in the table below prior to the year they are disclosed): Year ended December 31, Change 2023 2022 (in thousands) External research and development costs: IRAK4 $ 13,762 $ 17,850 $ (4,088 ) STAT3 11,490 8,332 3,158 MDM2 8,170 11,823 (3,653 ) Other 61,278 51,388 9,890 Research and development compensation and related personnel expense 65,039 55,751 9,288 Research and development overhead and administrative costs 29,342 19,104 10,238 Total research and development expenses $ 189,081 $ 164,248 $ 24,833 Research and development expenses were $189.1 million for the year ended December 31, 2023, compared to $164.2 million for the year ended December 31, 2022.
Our programs exemplify our focus on addressing high impact targets that have been elusive to conventional modalities and that drive the pathogenesis of multiple serious diseases with significant unmet medical needs.
Sanofi has initiated two Phase 2b clinical trials of KT-474 in patients with hidradenitis suppurativa (HS) and in patients with atopic dermatitis (AD). Our pipeline focuses on addressing high impact targets that have been elusive to conventional modalities and that drive the pathogenesis of multiple serious diseases with significant unmet medical needs.
We have incurred significant operating losses since inception. Our ability to generate product revenue sufficient to achieve profitability will depend heavily on the successful development and eventual commercialization of one or more of our current product candidates or any future product candidates.
Our ability to generate product revenue sufficient to achieve profitability will depend heavily on the successful development and eventual commercialization of one or more of our current product candidates or any future product candidates. Our net losses were $223.9 million, $147.0 million and $154.8 million for the years ended December 31, 2024, 2023 and 2022, respectively.
These increases were primarily offset by a $17.2 million reduction in direct expenses related to our activities for our IRAK4, IRAKIMiD and STAT3 programs due to changes in the stage of development of these programs and the discontinuation of IRAKIMiD.
These increases were partially offset by a $10.9 million reduction in activities related to our IRAK4 and STAT3 programs and a $17.4 million reduction in our other research and development costs due to stage progression and breakout of STAT6 and TYK2 programs.
Lease Commitments Our lease commitments reflect payments due for our two lease agreements for laboratory and office space in Watertown, Massachusetts that expire in March of 2030 and 2035, respectively. As of December 31, 2023, our contractual commitments for our leases were $134.5 million, which will be paid over the term of such leases.
Such arrangements primarily include those related to our lease commitments. Lease Commitments Our lease commitments reflect payments due for our two lease agreements for laboratory and office space in Watertown, Massachusetts that expire in March of 2030 and 2035, respectively.
Collaboration revenues were $46.8 million for the year ended December 31, 2022, of which $10.8 million and $36.0 million were attributable to our collaboration agreements with Vertex and Sanofi, respectively. Collaboration revenues were $72.8 million for the year ended December 31, 2021, of which $18.5 million and $54.3 million were attributable to our collaboration agreements with Vertex and Sanofi, respectively.
Collaboration revenues were $47.1 million for the year ended December 31, 2024, the entirety of which was attributable to our collaboration agreement with Sanofi. Collaboration revenues were $78.6 million for the year ended December 31, 2023, of which $8.4 million and $70.2 million were attributable to our collaboration agreements with Vertex and Sanofi, respectively.
On February 7, 2024, we completed the sale of 1,519,453 shares of common stock under the Sales agreement resulting in gross proceeds of approximately $50 million.
We agreed to pay Cowen a commission of up to 3.0% of the gross proceeds of any shares sold by Cowen under the Sales Agreement. As of December 31, 2024, we have sold 1,519,453 shares of common stock under the Sales Agreement resulting in gross proceeds of approximately $50 million.
During the year ended December 31, 2021, net cash provided by financing activities was $250.3 million, primarily consisting of $240.8 million of net proceeds received in our July 2021 follow on offering, $2.3 million from our July 2021 concurrent private placement, $7.6 million in proceeds from the exercise of employee stock options, $0.8 million in proceeds from the issuance of shares under our employee stock purchase plan offset by the payment of $0.4 million in offering costs related to our August 2020 IPO and finance lease payments of $0.8 million.
Cash Flow from Financing Activities During the year ended December 31, 2024, net cash provided by financing activities was $608.9 million, consisting of $547.9 million in proceeds from issuance of common stock and accompanying pre-funded warrants, net of offering costs, $48.7 million in proceeds from the issuance of common stock through the Cowen Sales Agreement, net of issuance costs, $11.8 million in proceeds from the exercise of employee stock options, $2.0 million from proceeds from the employee stock purchase plan, partially offset by finance lease payments of $1.6 million.
Our net losses were $147.0 million, $154.8 million and $100.2 million for the years ended December 31, 2023, 2022 and 2021, respectively. In addition, as of December 31, 2023 and 2022 we had an accumulated deficit of $530.8 million and $383.8 million, respectively.
In addition, as of December 31, 2024 and 2023, we had an accumulated deficit of $754.6 million and $530.8 million, respectively.
Other Income, Net Other income, net was $6.4 million for the year ended December 31, 2022, compared to $0.3 million for the year ended December 31, 2021. The $6.1 million increase was primarily due to the prevailing interest rates in the respective periods.
Other Income, Net Other income, net was $37.8 million for the year ended December 31, 2024, compared to $18.6 million for the year ended December 31, 2023.
In addition to the upfront payment, we are eligible to receive certain development milestone payments of up to $1.48 billion in the aggregate, of which more than $1.0 billion relates to the IRAK4 program, upon the achievement of certain developmental or regulatory events.
In consideration for the exclusive licenses granted to Sanofi under the Sanofi Agreement, Sanofi paid to us an upfront payment of $150.0 million. In addition to the upfront payment, under the agreement we were eligible to receive certain development milestone payments of up to $1.48 billion, and commercial milestone payments of up to $700.0 million, in the aggregate.
Results of Operations Comparison of years ended December 31, 2022 and 2021 The following table summarizes our results of operations for the years ended December 31, 2022 and 2021: Year ended December 31, Change 2022 2021 (in thousands) Collaboration Revenue $ 46,826 $ 72,832 $ (26,006 ) Operating expenses: Research and development 164,248 137,017 27,231 General and administrative 43,834 36,345 7,489 Total operating expenses 208,082 173,362 34,720 Loss from operations (161,256 ) (100,530 ) (60,726 ) Other income, net 6,448 313 6,135 Net loss $ (154,808 ) $ (100,217 ) $ (54,591 ) 118 Collaboration revenue We recognize revenue under each of our collaboration agreements based on our pattern of performance related to the respective identified performance obligation, which is the period over which we will perform research services under each of the respective agreements.
Results of Operations Comparison of years ended December 31, 2024 and 2023 The following table summarizes our results of operations for the years ended December 31, 2024 and 2023: Year ended December 31, Change 2024 2023 (in thousands) Collaboration Revenue $ 47,072 $ 78,592 $ (31,520 ) Operating expenses: Research and development 240,248 189,081 51,167 General and administrative 63,534 55,041 8,493 Impairment of long-lived assets 4,925 — 4,925 Total operating expenses 308,707 244,122 64,585 Loss from operations (261,635 ) (165,530 ) (96,105 ) Other income, net 37,777 18,568 19,209 Net loss $ (223,858 ) $ (146,962 ) $ (76,896 ) Collaboration revenue We recognize revenue under each of our collaboration agreements based on our pattern of performance related to the respective identified performance obligation, which is the period over which we will perform research services under each of the respective agreements.
We believe the existing cash, cash equivalents and marketable securities of $436.3 million as of December 31, 2023, together with the net proceeds from the first quarter of 2024 offerings and the $15 million milestone payment received in 121 January of 2024 under our collaboration agreement with Sanofi, will be sufficient to fund our operations into the first half of 2027.
As of December 31, 2024, we had cash, cash equivalents and marketable securities of $850.9 million. We believe the existing cash, cash equivalents and marketable securities on hand will be sufficient to fund our operations into mid 2027, which will enable us to execute on multiple data readouts across our programs.