Biggest changeOperating Expenses Research, Development and Clinical Trials Expenses Research, development and clinical trials expenses consist primarily of costs incurred for our research activities, product development, hardware and software engineering, clinical trials to continue to develop clinical evidence of our products’ safety and effectiveness, regulatory expenses, testing, consultant services and other costs associated with our OCS technology platform and OCS products, which include: • employee-related expenses, including salaries, related benefits and stock-based compensation expense for employees engaged in research, hardware and software development, regulatory and clinical trial functions, and recruiting and temporary service fees related to such personnel; • expenses incurred in connection with the clinical trials of our products, including under agreements with third parties, such as consultants, contractors and data management organizations; • the cost of maintaining and improving our product designs, including the testing of materials and parts used in our products; • laboratory supplies and research materials; and • facilities, depreciation and other expenses, which include direct and allocated expenses for rent and maintenance of facilities and insurance. 68 We expense research, development and clinical trials costs as incurred.
Biggest changeOperating Expenses Research, Development and Clinical Trials Expenses Research, development and clinical trials expenses consist of costs incurred for research activities, product development, hardware and software engineering and clinical trial activities, including salaries and related costs, including stock-based compensation, facilities costs, laboratory supplies, depreciation, testing, regulatory, data management and consulting costs.
Financing Activities During the year ended December 31, 2024, net cash provided by financing activities of $22.9 million consisted of proceeds from the issuance of common stock upon exercise of stock options of $20.8 million and proceeds from the issuance of common stock in connection with the 2019 Employee Stock Purchase Plan of $2.1 million.
During the year ended December 31, 2024, net cash provided by financing activities of $22.9 million consisted of proceeds from the issuance of common stock upon exercise of stock options of $20.8 million and proceeds from the issuance of common stock in connection with the 2019 Employee Stock Purchase Plan of $2.1 million.
For each new transplant procedure, these customers purchase an additional OCS disposable set for use on their existing organ-specific OCS Console. We also generate service revenue by providing outsourced organ procurement, OCS perfusion management and transplant logistics services under our NOP in the United States.
For each new transplant procedure, these customers purchase an additional OCS disposable set for use on their existing organ-specific OCS Console. We also generate service revenue by providing outsourced organ procurement, OCS perfusion management and transplant logistics services under our NOP in the United States.
We recognize revenue from the single, combined performance obligation only once the OCS Console has arrived at the customer site and the training and equipment set-up have been completed by us. 77 Customer orders may include the loan of an OCS Console as well as OCS disposable sets used in each transplant procedure.
We recognize revenue from the single, combined performance obligation only once the OCS Console has arrived at the customer site and the training and equipment set-up have been completed by us. Customer orders may include the loan of an OCS Console as well as OCS disposable sets used in each transplant procedure.
Components of Our Results of Operations Revenue We generate net product revenue primarily from sales of our single-use, organ-specific disposable sets used on our organ-specific OCS Consoles. To a lesser extent, we also generate product revenue from the sale of OCS Consoles to customers and the implied rental of OCS Consoles loaned to customers at no charge.
Key Components of Our Results of Operations Revenue We generate net product revenue primarily from sales of our single-use, organ-specific disposable sets used on our organ-specific OCS Consoles. To a lesser extent, we also generate product revenue from the sale of OCS Consoles to customers and the implied rental of OCS Consoles loaned to customers at no charge.
Cost of service revenue primarily consists of labor and overhead that directly support organ procurement and OCS perfusion management services and transportation and logistics costs, including labor costs for pilots, aircraft depreciation, aircraft costs, fuel, crew travel, maintenance and third-party flight costs and ground transportation that support organ delivery.
Cost of service revenue primarily consists of labor and overhead that directly support organ procurement and OCS perfusion management services and transportation and transplant logistics costs, including labor costs for pilots, aircraft depreciation, aircraft costs, fuel, crew travel, maintenance and third-party flight costs and ground transportation that support organ delivery.
Economic Impacts Inflation, changes in trade policies, and the imposition of duties and tariffs have and could continue to adversely impact the price or availability of raw materials, the components of our products as well as shipping and transportation costs.
Economic Impacts Inflation, changes in trade policies, and the imposition of or changes in the amount of duties and tariffs have and could continue to adversely impact the price or availability of raw materials, the components of our products as well as shipping and transportation costs.
We expect that our selling, general and administrative expenses will increase over the long term as we increase our headcount to support the expected continued sales growth of our OCS products and our NOP.
We expect that our selling, general and administrative expenses will increase over the long term as we increase our headcount and infrastructure to support the expected continued sales growth of our OCS products and our NOP.
For example, if the demand for our products exceeds our existing manufacturing and sterilization capacity, our ability to fulfill orders would be limited until we have sufficiently expanded such operations.
If the demand for our products exceeds our existing manufacturing and sterilization capacity, our ability to fulfill orders would be limited until we have sufficiently expanded such operations.
In addition, we received a Class II Medical Device License from Health Canada for our OCS Liver combined with our solution additives in October 2023 to complement our existing Health Canada licenses for OCS Heart and OCS Lung. 67 We expect that our revenue will increase over the long term as a result of the continued growth of the NOP in the United States.
In addition, we received a Class II Medical Device License from Health Canada for our OCS Liver combined with our solution additives in October 2023 to complement our existing Health Canada licenses for OCS Heart and OCS Lung. 66 We expect that our revenue will increase over the long term as a result of the continued growth of the NOP in the United States.
Liquidity and Capital Resources Prior to 2024, we had incurred significant annual operating losses since inception and we may continue to incur losses in the future.
Liquidity and Capital Resources Prior to 2024, we had incurred significant annual operating losses since inception and we may incur losses in the future.
Other Income (Expense) Interest Expense Interest expense consists of interest expense associated with outstanding borrowings under our loan agreements as well as the amortization of debt discounts associated with such agreements. In July 2022, we entered into a credit agreement with Canadian Imperial Bank of Commerce, or CIBC, under which we borrowed $60.0 million.
Other Income (Expense) Interest Expense Interest expense consists of interest expense associated with outstanding borrowings under our loan agreement and our Notes as well as the amortization of debt discounts associated with such agreements. In July 2022, we entered into a credit agreement with Canadian Imperial Bank of Commerce, or CIBC, under which we borrowed $60.0 million.
As of December 31, 2024, we were in compliance with all financial covenants of the CIBC Credit Agreement. During the continuance of an event of default, the interest rate per annum will be equal to the rate that would have otherwise been applicable at the time of the event of default plus 2.0%.
As of December 31, 2025, we were in compliance with all financial covenants of the CIBC Credit Agreement. During the continuance of an event of default, the interest rate per annum will be equal to the rate that would have otherwise been applicable at the time of the event of default plus 2.0%.
While we expect our revenue to increase over the long term, revenue from sales may fluctuate from quarter to quarter as the timing of organ transplant procedures is generally unpredictable, and we have observed periodic fluctuations in the availability of donor organs, which impacts the volume of transplants.
While we expect our revenue to increase over the long term, revenue from sales may fluctuate from quarter to quarter as the timing of organ transplant procedures is generally unpredictable, and we have observed periodic fluctuations in the availability of donor organs and transplant center surgeons, which impacts the volume of transplants.
Prior to 2024, we had incurred significant annual operating losses since inception and we have only recently achieved profitability. Our ability to generate revenue sufficient to achieve sustained profitability will depend on the continued commercial sales of our OCS products and NOP services.
Prior to 2024, we had incurred significant annual operating losses since inception and we have only recently achieved profitability. Our ability to generate revenue sufficient to achieve sustained profitability will depend on the continued commercial sales of our products and services.
For a discussion of our cash flows for the year ended December 31, 2022, see Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Cash Flows included in our Annual Report on Form 10-K for the year ended December 31, 2023.
For a discussion of our cash flows for the year ended December 31, 2023, see Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—Liquidity and Capital Resources—Cash Flows included in our Annual Report on Form 10-K for the year ended December 31, 2024.
Management’s Discussion and Analysis of Financial Condition and Results of Operations—Components of Our Results of Operations—Comparison of the Years Ended December 31, 2023, 2022 and 2021 included in our Annual Report on Form 10-K for the year ended December 31, 2023.
Management’s Discussion and Analysis of Financial Condition and Results of Operations—Components of Our Results of Operations—Comparison of the Years Ended December 31, 2024, 2023 and 2022 included in our Annual Report on Form 10-K for the year ended December 31, 2024.
Through December 31, 2024, all of our sales outside of the United States have been commercial sales (unrelated to any clinical trials). Our sales in the EU are dependent on obtaining and maintaining the CE mark certifications for each of our OCS products.
Through December 31, 2025, our sales outside of the United States have been commercial sales (unrelated to any clinical trials). Sales in the EU are dependent on obtaining and maintaining the CE mark certifications for each of our OCS products.
The timing and amount of our operating and capital expenditures will depend on many factors, including: • the amount of product revenue generated by sales of our OCS Consoles, OCS disposable sets and other products that may be approved in the United States and select non-U.S. markets, revenue generated by our services, and growth of the NOP; • the costs and expenses of expanding our U.S. and non-U.S. sales and marketing infrastructure and our manufacturing operations; • the extent to which our OCS products are adopted by the transplant community; • the ability of our customers to obtain adequate reimbursement from third-party payors for procedures performed using the OCS products; • the degree of success we experience in commercializing our OCS products for additional indications; • the costs, timing and outcomes of post-approval studies or any future clinical studies and regulatory reviews, including to seek and obtain approvals for new indications for our OCS products; • the emergence of competing or complementary technologies or procedures; • the number and types of future products we develop and commercialize; • the cost of development of the next generation OCS; • the costs associated with maintaining and improving our commercial operations, including the NOP; • the costs associated with maintaining and growing our logistics capabilities, including by means of attracting, training and retaining pilots, and the acquisition, maintenance, or replacement of fixed-wing aircraft for our aviation transportation services or other acquisitions, joint ventures or strategic investments; • the costs of preparing, filing and prosecuting patent applications and maintaining, enforcing and defending intellectual property-related claims; and • the level of our selling, general and administrative expenses.
The timing and amount of our operating and capital expenditures will depend on many factors, including: • the amount of product revenue generated by sales of our OCS Consoles, OCS disposable sets and other products that may be approved in the United States and select non-U.S. markets, revenue generated by our services, and growth of the NOP; • the costs and expenses of expanding our U.S. and non-U.S. sales, marketing and logistics infrastructure and our manufacturing operations; • the extent to which our OCS products are adopted by the transplant community; • the ability of our customers to obtain adequate reimbursement from third-party payors for procedures performed using the OCS products; • the degree of success we experience in commercializing our OCS products for additional indications; • the costs, timing and outcomes of pre- and post-approval studies or any future clinical studies and regulatory reviews, including to seek and obtain approvals for new indications for our OCS products; 74 • the emergence of competing or complementary technologies or procedures; • the number and types of future products we develop and commercialize; • the cost of constructing research and development and manufacturing facilities in Italy; • the cost and timing of development of the next generation OCS; • the costs associated with maintaining, improving and expanding our commercial operations, including the NOP globally; • the costs associated with maintaining and growing our transplant logistics capabilities, including by means of attracting, training and retaining pilots, and the acquisition, maintenance, or replacement of fixed-wing aircraft for our aviation transportation services or other acquisitions, joint ventures or strategic investments; • the costs of preparing, filing and prosecuting patent applications and maintaining, enforcing and defending intellectual property-related claims; • the level of our selling, general and administrative expenses; and • the costs related to establishing and relocating to a new long-term global headquarters to accommodate the growing scale and complexity of our business.
Any write-down of inventory to net realizable value creates a new cost basis. The reserve for excess and obsolete inventory was $2.5 million and $0.8 million as of December 31, 2024 and 2023, respectively.
Any write-down of inventory to net realizable value creates a new cost basis. The reserve for excess and obsolete inventory was $3.0 million and $2.5 million as of December 31, 2025 and 2024, respectively.
Laboratory supplies and research materials costs increased by $6.1 million from the year ended December 31, 2023 to the year ended December 31, 2024 primarily due to our increased need for supplies and materials used for development of our next generation OCS.
Laboratory supplies and research materials costs increased by $3.6 million from the year ended December 31, 2024 to the year ended December 31, 2025 primarily due to our increased need for supplies and materials used for development of our next generation OCS.
We lease facilities under long-term non-cancelable operating leases that have a weighted average remaining lease term of 3.7 years as of December 31, 2024. As of December 31, 2024, we had fixed lease payment obligations of $10.3 million, of which $3.3 million is payable during 2025.
We lease facilities under long-term non-cancelable operating leases that have a weighted average remaining lease term of 2.8 years as of December 31, 2025. As of December 31, 2025, we had fixed lease payment obligations of $7.8 million, of which $3.7 million is payable during 2026.
If we are unable to raise capital or enter into such agreements as, and when, needed, we will have to delay, scale back or discontinue the further development and commercialization efforts of one or more of our products, or may be forced to terminate our operations. 66 In March 2023, the U.S.
If we are unable to raise capital or enter into such agreements as, and when, needed, we will have to delay, scale back or discontinue the further development and commercialization efforts of one or more of our products, or may be forced to terminate our operations.
Personnel related costs increased by $6.4 million primarily due to increased headcount to support development efforts for our next generation OCS and overall compensation increases. Personnel related costs included stock-based compensation expense of $4.2 million and $2.8 million for the years ended December 31, 2024 and 2023, respectively.
Personnel related costs increased by $3.8 million primarily due to increased headcount to support development efforts for our next generation OCS program and overall compensation increases. Personnel related costs included stock-based compensation expense of $4.7 million and $4.2 million for the years ended December 31, 2025 and 2024, respectively.
In January 2021, we entered into an unconditional $9.5 million purchase commitment in the ordinary course of business, for goods with specified annual minimum quantities to be purchased through December 2029. The contract is not cancellable without penalty. As of December 31, 2024, our remaining purchase commitment is $5.0 million.
In January 2021, we entered into an unconditional $9.5 million purchase commitment in the ordinary course of business, for goods with specified annual minimum quantities to be purchased through December 2029. The contract is not cancellable without penalty.
In the future, we expect that research, development and clinical trials expenses will increase over the long term due to ongoing product development and approval efforts.
We expense research, development and clinical trials costs as incurred. In the future, we expect that research, development and clinical trials expenses will increase over the long term due to ongoing product development and approval efforts.
Our estimate of payments is based on an assumed rate of 6.4%, which was the interest rate in effect at December 31, 2024. On May 11, 2023, we issued $460.0 million aggregate principal amount of the Notes.
Our estimate of interest payments is based on an assumed rate of 5.7%, which was the interest rate in effect at December 31, 2025. On May 11, 2023, we issued $460.0 million aggregate principal amount of the Notes.
We have also developed our NOP, an innovative turnkey solution to provide outsourced organ procurement, OCS perfusion management and transplant logistics services, to provide transplant programs in the United States with a more efficient process to procure donor organs with the OCS.
We have also developed our NOP, an innovative turnkey solution to provide outsourced organ procurement, OCS perfusion management and transplant logistics services, to provide transplant programs in the United States with a more efficient process to procure donor organs with the OCS. Our transplant logistics services include aviation transportation, ground transportation, and other coordination activity.
Cost of service revenue included approximately $3.1 million and $4.4 million for the years ended December 31, 2024 and 2023, respectively, of costs from Summit's legacy operations, unrelated to the NOP and organ transplant. Overall gross margin was 59% and 64% for the years ended December 31, 2024 and 2023, respectively.
Cost of service revenue included approximately $2.9 million and $3.1 million for the years ended December 31, 2025 and 2024, respectively, of costs from Summit's legacy operations, unrelated to the NOP and organ transplant. Overall gross margin was 60% and 59% for the years ended December 31, 2025 and 2024, respectively.
Revenue from customers outside the United States was $15.3 million and $15.4 million in the years ended December 31, 2024 and 2023, respectively. Cost of Revenue, Gross Profit and Gross Margin Cost of net product revenue increased by $17.3 million in the year ended December 31, 2024 compared to the year ended December 31, 2023.
Revenue from customers outside the United States was $16.7 million and $15.3 million in the years ended December 31, 2025 and 2024, respectively. Cost of Revenue, Gross Profit and Gross Margin Cost of net product revenue increased by $19.5 million in the year ended December 31, 2025 compared to the year ended December 31, 2024.
We also enter into other contracts in the normal course of business with consulting firms, material suppliers and other third parties for clinical trials and testing and manufacturing services. These contracts do not contain material minimum purchase commitments and are cancelable by us upon prior written notice.
As of December 31, 2025, our remaining purchase commitment is $4.0 million. 75 We also enter into other contracts in the normal course of business with consulting firms, material suppliers and other third parties for clinical trials and testing and manufacturing services. These contracts do not contain material minimum purchase commitments and are cancelable by us upon prior written notice.
Revenue from sales to customers of OCS Perfusion Sets, OCS Solutions and OCS Consoles is classified as net product revenue in the our consolidated statements of operations. Revenue from sales to customers of organ procurement, OCS perfusion management and transplant logistics services is classified as service revenue in our consolidated statements of operations.
Revenue from sales to customers of OCS Perfusion Sets, OCS Solutions and OCS Consoles is classified as net product revenue in the our consolidated statements of operations.
A conditional conversion feature of the Notes was triggered on June 30, 2024 and again on September 30, 2024, as the last reported sale price of our common stock was greater than or equal to 130% of the conversion price of the Notes for at least 20 trading days during the period of 30 consecutive trading days ending on and including the last trading day of each of the quarters ended June 30, 2024 and September 30, 2024, respectively, and the Notes therefore became convertible at the noteholders’ election in the immediately following calendar quarters ended September 30, 2024 and December 31, 2024, respectively.
A conditional conversion feature of the Notes was triggered on December 31, 2025, as the last reported sale price of our common stock was greater than or equal to 130% of the conversion price of the Notes for at least 20 trading days during the period of 30 consecutive trading days ending on and including the last trading day of the quarter ended December 31, 2025, and the Notes therefore became convertible at the noteholders’ election in the calendar quarter ending March 31, 2026 (and only during this calendar quarter).
With the acquisition of Summit in August 2023, the purchase of fixed-wing transplant aircraft and the addition of a logistics team, we anticipate increased service revenue from our logistics services. Prior to our acquisition in 2023, Summit derived its revenue primarily from charter flight services.
With the acquisition of Summit in August 2023, the purchase of fixed-wing transplant aircraft and the addition of a logistics team, we have increased service revenue from our transplant logistics services.
Organ Procurement and Transplantation Network Act was signed into law and expressly authorizes HRSA to award multiple grants, contracts or cooperative agreements to support the operation of the OPTN and specifies that the OPTN shall be operated through awards that are distinct from awards made to support the organization tasked with supporting the networks’ board of directors.
Organ Procurement and Transplantation Network Act was signed into law. This legislation expressly authorizes HRSA to award multiple grants, contracts or cooperative agreements to support the operation of the OPTN. It also specifies that the awards to operate the OPTN shall be distinct from awards to support the networks’ board of directors.
At our option, we may prepay borrowings outstanding under the CIBC Credit Agreement, without a prepayment fee. All obligations under the CIBC Credit Agreement are guaranteed by us and each of our material subsidiaries. All obligations of us and each guarantor are secured by substantially all of our and each guarantor’s assets, including their intellectual property, subject to certain exceptions.
All obligations under the CIBC Credit Agreement are guaranteed by us and each of our material subsidiaries. All obligations of us and each guarantor are secured by substantially all of our and each guarantor’s assets, including their intellectual property, subject to certain exceptions.
As of December 31, 2024, our outstanding principal balance was $60.0 million, which is repayable in equal monthly installments starting in July 2026 until its maturity in July 2027. We estimate we will pay $3.9 million in interest payments during 2025.
As of December 31, 2025, our outstanding principal balance was $60.0 million, which is repayable in equal monthly installments starting in July 2026 with the remaining balance due on the maturity date in July 2027. We estimate we will pay $10.0 million in principal payments and $3.4 million in interest payments during 2026.
At December 31, 2024, our principal source of liquidity was cash of $336.7 million 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) Net cash provided by (used in) operating activities $ 48,803 $ (13,028 ) $ (45,817 ) Net cash provided by (used in) investing activities (129,303 ) (193,953 ) 54,513 Net cash provided by financing activities 22,874 400,418 167,927 Effect of exchange rate changes on cash, cash equivalents and restricted cash (536 ) 193 (1,021 ) Net increase (decrease) in cash, cash equivalents and restricted cash $ (58,162 ) $ 193,630 $ 175,602 Operating Activities During the year ended December 31, 2024, operating activities provided $48.8 million of cash, primarily resulting from our net income of $35.5 million and net non-cash charges of $58.3 million, partially offset by net cash used by changes in our operating assets and liabilities of $45.0 million.
At December 31, 2025, our principal source of liquidity was cash of $488.4 million Cash Flows The following table summarizes our sources and uses of cash for each of the periods presented: Year Ended December 31, 2025 2024 2023 (in thousands) Net cash provided by (used in) operating activities $ 192,840 $ 48,803 $ (13,028 ) Net cash used in investing activities (59,251 ) (129,303 ) (193,953 ) Net cash provided by financing activities 16,857 22,874 400,418 Effect of exchange rate changes on cash and restricted cash 1,270 (536 ) 193 Net increase (decrease) in cash and restricted cash $ 151,716 $ (58,162 ) $ 193,630 Operating Activities During the year ended December 31, 2025, operating activities provided $192.8 million of cash, primarily resulting from our net income of $190.3 million and net cash provided by changes in our operating assets and liabilities of $18.4 million, partially offset by net non-cash income of $15.8 million.
Cost of service revenue increased by $74.6 million in the year ended December 31, 2024 compared to the year ended December 31, 2023 as we increased utilization of the NOP. Gross profit increased by $108.0 million in the year ended December 31, 2024 compared to the year ended December 31, 2023.
Cost of service revenue increased by $43.8 million in the year ended December 31, 2025 compared to the year ended December 31, 2024 as we increased utilization of the NOP. Gross profit increased by $100.7 million in the year ended December 31, 2025 compared to the year ended December 31, 2024.
In September 2024, HRSA began awarding contracts aimed at supporting these initiatives. The impact that the HRSA initiatives and the U.S. Organ Procurement and Transplantation Network Act may have on our business, including on our NOP, is uncertain at this time.
The impact that HRSA's initiatives and the U.S. Organ Procurement and Transplantation Network Act may have on our business, including on our NOP, is uncertain at this time.
Recently Issued Accounting Pronouncements A description of recently issued accounting pronouncements that may potentially impact our financial position, results of operations or cash flows is disclosed in Note 2 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.
Adjustments to fair values of assets and liabilities made after the end of the measurement period are recorded within operating results. 77 Recently Issued Accounting Pronouncements A description of recently issued accounting pronouncements that may potentially impact our financial position, results of operations or cash flows is disclosed in Note 2 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.
The increase in product gross margin was primarily as a result of increased sales volume and increased sales of higher margin OCS disposable sets. Gross margin from service revenue was 28% and 29% for the years ended December 31, 2024 and 2023, respectively, and consisted primarily of organ procurement, OCS perfusion management and transplant logistics services under our NOP.
Gross margin from net product revenue was 79% for each of the years ended December 31, 2025 and 2024. Gross margin from service revenue was 29% and 28% for the years ended December 31, 2025 and 2024, respectively, and consisted primarily of organ procurement, OCS perfusion management and transplant logistics services under our NOP.
For example, the global economy has experienced extreme volatility and disruptions, including significant volatility in commodity, other material and labor costs, declines in consumer confidence, declines in economic growth, supply chain interruptions, uncertainty about economic stability and record inflation globally.
For example, tariffs related to a small portion of components that we import moderately increased our cost of revenue in 2025. The global economy has experienced extreme volatility and disruptions, including significant volatility in commodity, other material and labor costs, declines in consumer confidence, declines in economic growth, supply chain interruptions, uncertainty about economic stability and record inflation globally.
Investing Activities During the year ended December 31, 2024, net cash used in investing activities of $129.3 million consisted primarily of purchases of property, plant and equipment of $129.7 million, including an increase of $110.2 million in transplant aircraft.
Investing Activities During the year ended December 31, 2025, net cash used in investing activities of $59.3 million consisted of purchases of property, plant and equipment, primarily related to the purchase of transplant aircraft.
As of the end of each reporting period presented in our consolidated financial statements included elsewhere in this Annual Report on Form 10-K, we did not identify any potential losses arising from remaining future purchase commitments as compared to estimated future customer sales through the remainder of the term of the manufacturing purchase commitment and, as a result, did not recognize in a current period any loss provision for future-period remaining purchase commitments. 78 Business Combinations and Fair Value Estimates In determining whether an acquisition should be accounted for as a business combination or asset acquisition, we first determine whether substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets.
As of the end of each reporting period presented in our consolidated financial statements included elsewhere in this Annual Report on Form 10-K, we did not identify any potential losses arising from remaining future purchase commitments as compared to estimated future customer sales through the remainder of the term of the manufacturing purchase commitment and, as a result, did not recognize in a current period any loss provision for future-period remaining purchase commitments.
We generated total revenue of $441.5 million and had net income of $35.5 million for the year ended December 31, 2024. We generated total revenue of $241.6 million and incurred a net loss of $25.0 million for the year ended December 31, 2023. As of December 31, 2024, we had an accumulated deficit of $468.2 million.
We generated total revenue of $605.5 million and had net income of $190.3 million for the year ended December 31, 2025. We generated total revenue of $441.5 million and had net income of $35.5 million for the year ended December 31, 2024. As of December 31, 2025, we had an accumulated deficit of $278.0 million.
In addition, we may be required to prepay outstanding borrowings, subject to certain exceptions, with portions of net cash proceeds of certain asset sales and certain casualty and condemnation events. 75 Funding Requirements As we continue to pursue and increase commercial sales of our OCS products, we expect our costs and expenses to increase in the future, particularly as we expand our commercial team, grow our NOP, scale our manufacturing and sterilization operations, continue research, development and clinical trial efforts, seek regulatory approval for new products and product enhancements, including new indications, both in the United States and in select non-U.S. markets, and seek greater control of air and ground transport for our NOP.
Funding Requirements As we continue to pursue and increase commercial sales of our OCS products, we expect our costs and expenses to increase in the future, particularly as we expand our commercial team, grow our NOP, scale our manufacturing and sterilization operations, continue research, development and clinical trial efforts, including expanding our research and development and manufacturing capabilities in Italy, seek regulatory approval for the next generation OCS, new products and product enhancements, including new indications, both in the United States and in select non-U.S. markets, establish and relocate to a new long-term global headquarters, and seek greater control of air and ground transport for our NOP.
Department of Health and Human Services’ Health Resources and Services Administration, or HRSA, announced initiatives designed to improve the OPTN, including its intent to solicit contract proposals to manage the OPTN, which is currently operated by the United Network for Organ Sharing, or UNOS, under a contract that expired in March 2024. Additionally, in September 2023, the Securing the U.S.
Department of Health and Human Services’ Health Resources and Services Administration, or HRSA, announced initiatives designed to improve the OPTN, including its intent to solicit contract proposals to manage the OPTN under a multi-vendor model following the expiration of the sole-vendor contract between UNOS and HRSA on March 29, 2024. Additionally, in September 2023, the Securing the U.S.
From and after March 1, 2028, noteholders may convert their Notes at any time at their election until the close of business on the second scheduled trading day immediately before the maturity date.
From and after March 1, 2028, noteholders may convert their Notes at any time at their election until the close of business on the second scheduled trading day immediately before the maturity date. We have the right to elect to settle conversions either in cash, shares or in a combination of cash and shares of our common stock.
Foreign currency transaction gains and losses result from intercompany transactions as well as transactions with customers or vendors denominated in currencies other than the functional currency of the legal entity in which the transaction is recorded. 69 Results of Operations Comparison of the Years Ended December 31, 2024, 2023 and 2022 The following table summarizes our results of operations for the years ended December 31, 2024, 2023 and 2022: Year Ended December 31, 2024 2023 2022 (in thousands) Revenue: Net product revenue $ 273,866 $ 176,069 $ 79,234 Service revenue 167,674 65,554 14,225 Total revenue 441,540 241,623 93,459 Cost of revenue: Cost of net product revenue 58,345 41,015 16,970 Cost of service revenue 121,114 46,515 11,217 Total cost of revenue 179,459 87,530 28,187 Gross profit 262,081 154,093 65,272 Operating expenses: Research, development and clinical trials 55,968 36,055 26,812 Acquired in-process research and development expenses — 27,212 — Selling, general and administrative 168,617 119,553 69,897 Total operating expenses 224,585 182,820 96,709 Income (loss) from operations 37,496 (28,727 ) (31,437 ) Other income (expense): Interest expense (14,409 ) (10,791 ) (3,726 ) Interest income and other income (expense), net 12,693 12,847 (1,002 ) Total other income (expense), net (1,716 ) 2,056 (4,728 ) Income (loss) before income taxes 35,780 (26,671 ) (36,165 ) (Provision) benefit for income taxes (316 ) 1,643 (66 ) Net income (loss) $ 35,464 $ (25,028 ) $ (36,231 ) Revenue OCS transplant-related revenue consists of: Year Ended December 31, 2024 2023 Change (in thousands) OCS transplant revenue by country by organ: United States Lung total revenue $ 15,755 $ 10,548 $ 5,207 Heart total revenue 96,663 59,080 37,583 Liver total revenue 309,462 151,719 157,743 Total United States OCS transplant revenue 421,880 221,347 200,533 All other countries Lung total revenue 1,926 1,272 654 Heart total revenue 13,198 14,012 (814 ) Liver total revenue 158 104 54 Total all other countries OCS transplant revenue 15,282 15,388 (106 ) Total OCS transplant revenue $ 437,162 $ 236,735 $ 200,427 We also had service revenue unrelated to OCS transplant of $4.4 million and $4.9 million for the years ended December 31, 2024 and 2023, respectively. 70 Revenue from customers in the United States related to OCS transplant was $421.9 million in the year ended December 31, 2024 and increased by $200.5 million compared to the year ended December 31, 2023, primarily due to higher sales volumes of our OCS Liver and OCS Heart disposable sets.
To the extent allowed, we intend to use our available net operating loss carryforwards and tax credits to reduce cash tax payment obligations. 68 Results of Operations Comparison of the Years Ended December 31, 2025, 2024 and 2023 The following table summarizes our results of operations for the years ended December 31, 2025, 2024 and 2023: Year Ended December 31, 2025 2024 2023 (in thousands) Revenue: Net product revenue $ 372,401 $ 273,866 $ 176,069 Service revenue 233,093 167,674 65,554 Total revenue 605,494 441,540 241,623 Cost of revenue: Cost of net product revenue 77,822 58,345 41,015 Cost of service revenue 164,866 121,114 46,515 Total cost of revenue 242,688 179,459 87,530 Gross profit 362,806 262,081 154,093 Operating expenses: Research, development and clinical trials 69,055 55,968 36,055 Acquired in-process research and development expenses — — 27,212 Selling, general and administrative 185,168 168,617 119,553 Total operating expenses 254,223 224,585 182,820 Income (loss) from operations 108,583 37,496 (28,727 ) Other income (expense): Interest expense (13,782 ) (14,409 ) (10,791 ) Interest income and other income (expense), net 12,721 12,693 12,847 Total other income (expense), net (1,061 ) (1,716 ) 2,056 Income (loss) before income taxes 107,522 35,780 (26,671 ) (Provision) benefit for income taxes 82,769 (316 ) 1,643 Net income (loss) $ 190,291 $ 35,464 $ (25,028 ) Revenue OCS transplant-related revenue consists of: Year Ended December 31, 2025 2024 2023 (in thousands) OCS transplant revenue by country by organ: United States Lung total revenue $ 13,443 $ 15,755 $ 10,548 Heart total revenue 111,839 96,663 59,080 Liver total revenue 459,415 309,462 151,719 Total United States OCS transplant revenue 584,697 421,880 221,347 All other countries Lung total revenue 1,418 1,926 1,272 Heart total revenue 14,169 13,198 14,012 Liver total revenue 1,113 158 104 Total all other countries OCS transplant revenue 16,700 15,282 15,388 Total OCS transplant revenue $ 601,397 $ 437,162 $ 236,735 We also had service revenue unrelated to OCS transplant of $4.1 million, $4.4 million and $4.9 million for the years ended December 31, 2025, 2024 and 2023, respectively. 69 Revenue from customers in the United States related to OCS transplant was $584.7 million in the year ended December 31, 2025 and increased by $162.8 million compared to the year ended December 31, 2024, primarily due to higher sales volumes of our OCS Liver and OCS Heart disposable sets.
Interest Income and Other Income (Expense), Net Interest income and other income (expense), net for the years ended December 31, 2024 and 2023 included interest income of $13.4 million and $12.5 million, respectively, from interest earned on invested cash balances.
Interest Income and Other Income (Expense), Net Interest income and other income (expense), net for the years ended December 31, 2025 and 2024 included interest income of $11.4 million and $13.4 million, respectively, from interest earned on cash balances. The decrease in interest income was primarily due to lower yields on our cash balances.
Operating Expenses Research, Development and Clinical Trials Expenses Year Ended December 31, 2024 2023 Change (in thousands) Personnel related (including stock-based compensation expense) $ 21,927 $ 15,489 $ 6,438 Laboratory supplies and research materials 13,990 7,939 6,051 Consulting and third-party services 12,920 5,788 7,132 Clinical trials costs 478 1,077 (599 ) Facility related and other 6,653 5,762 891 Total research, development and clinical trials expenses $ 55,968 $ 36,055 $ 19,913 71 Total research, development and clinical trials expenses increased by $19.9 million from $36.1 million in the year ended December 31, 2023 to $56.0 million in the year ended December 31, 2024.
Operating Expenses Research, Development and Clinical Trials Expenses Year Ended December 31, 2025 2024 Change (in thousands) Personnel related (including stock-based compensation expense) $ 25,720 $ 21,927 $ 3,793 Laboratory supplies and research materials 17,550 13,990 3,560 Consulting and third-party services 15,492 12,920 2,572 Clinical trials costs 1,459 478 981 Facility related and other 8,834 6,653 2,181 Total research, development and clinical trials expenses $ 69,055 $ 55,968 $ 13,087 Total research, development and clinical trials expenses increased by $13.1 million from $56.0 million in the year ended December 31, 2024 to $69.1 million in the year ended December 31, 2025.
Other income (expense), net included $0.7 million of realized and unrealized foreign currency transactions losses for the year ended December 31, 2024, and $0.3 million of realized and unrealized foreign currency transactions gains during the year ended December 31, 2023. 72 (Provision) Benefit for Income Taxes Income taxes for the years ended December 31, 2024 and 2023 included a tax provision of $0.3 million and less than $0.1 million, respectively, related to state and foreign income taxes.
Interest income and other income (expense), net also included $1.0 million of realized and unrealized foreign currency transactions gains for the year ended December 31, 2025, and $0.7 million of realized and unrealized foreign currency transactions losses during the year ended December 31, 2024.
Long-Term Debt In July 2022, we entered into a credit agreement with CIBC as amended by the First Amendment to Credit Agreement, dated as of May 8, 2023, by and among the Company and CIBC, or the First Amendment, the Second Amendment to Credit Agreement, dated as of June 23, 2023, by and among the Company and CIBC, or the Second Amendment, and the Third Amendment to Credit Agreement, dated as of November 9, 2023, by and among the Company and CIBC, or the Third Amendment, pursuant to which we borrowed $60.0 million, referred to herein as the CIBC Credit Agreement.
If this condition or another conversion condition is met in the future, the Notes may again become convertible, otherwise the Notes will be convertible at the noteholders’ election from March 1, 2028 through the close of business on the second scheduled trading day immediately before the maturity date. 73 Long-Term Debt In July 2022, we entered into a credit agreement with CIBC as amended by the First Amendment to Credit Agreement, dated as of May 8, 2023, by and among the Company and CIBC, or the First Amendment, the Second Amendment to Credit Agreement, dated as of June 23, 2023, by and among the Company and CIBC, or the Second Amendment, and the Third Amendment to Credit Agreement, dated as of November 9, 2023, by and among the Company and CIBC, or the Third Amendment, pursuant to which we borrowed $60.0 million, referred to herein as the CIBC Credit Agreement.
During the year ended December 31, 2023, operating activities used $13.0 million of cash, primarily resulting from our net loss of $25.0 million and net cash used by changes in our operating assets and liabilities of $44.3 million, partially offset by net non-cash charges of $56.3 million, which included an IPR&D charge of $27.2 million.
During the year ended December 31, 2024, operating activities provided $48.8 million of cash, primarily resulting from our net income of $35.5 million and net non-cash charges of $58.3 million, partially offset by net cash used by changes in our operating assets and liabilities of $45.0 million.
Interest Income and Other Income (Expense), Net Interest income and other income (expense), net includes interest income, realized and unrealized foreign currency transaction gains and losses and other non-operating income and expense items unrelated to our core operations. Interest income consists of interest earned on our invested cash balances.
In May 2023, we issued and sold $460.0 million in aggregate principal amount of our Notes. Interest Income and Other Income (Expense), Net Interest income and other income (expense), net includes interest income, realized and unrealized foreign currency transaction gains and losses and other non-operating income and expense items unrelated to our core operations.
Selling, General and Administrative Expenses Selling, general and administrative expenses consist primarily of salaries and related costs, including stock-based compensation, for personnel in our commercial team and personnel in executive, marketing, finance and administrative functions, and recruiting and temporary service fees for such personnel.
Acquired In-Process Research and Development Expenses Acquired in-process research and development expenses, or IPR&D, consist of the acquisition value of transactions that do not qualify as a business combination and that do not have an alternative future use. 67 Selling, General and Administrative Expenses Selling, general and administrative expenses consist primarily of salaries and related costs, including stock-based compensation, for personnel in our commercial team and personnel in executive, marketing, finance and administrative functions, and recruiting and temporary service fees for such personnel.
Revenue is recognized when control is transferred to the customer in an amount that reflects the consideration we expect to be entitled to in exchange for the product or services.
Revenue from sales to customers of organ procurement, OCS perfusion management and transplant logistics services is classified as service revenue in our consolidated statements of operations. 76 Revenue is recognized when control is transferred to the customer in an amount that reflects the consideration we expect to be entitled to in exchange for the product or services.
Net cash used by changes in our operating assets and liabilities for the year ended December 31, 2023 consisted primarily of an increase in accounts receivable of $33.8 million, an increase in inventory of $28.1 million and an increase in prepaid expenses and other current assets of $2.1 million, partially offset by an increase in accounts payable and accrued expenses and other current liabilities of $21.2 million. 73 Changes in accounts receivable, inventory, prepaid expenses and other current assets, accounts payable, and accrued expenses and other current liabilities in each reporting period are generally due to growth in our business and timing of invoices and payments.
Net cash provided by changes in our operating assets and liabilities for the year ended December 31, 2025 consisted primarily of a decrease in accounts receivable of $14.0 million and a net increase in accounts payable and accrued expenses and other current liabilities of $17.7 million, partially offset by an increase in inventory of $7.7 million and an increase in prepaid expenses and other current assets of $3.8 million.
Consulting and third-party services costs increased by $7.1 million due to development efforts by our external development consultants for our next generation OCS, other product development and digital tools.
Consulting and third-party services costs increased by $2.6 million due to development efforts by our external development consultants for our next generation OCS program and other product development, including our kidney transport system. Clinical trial costs increased by $1.0 million due primarily to the initiation of clinical trial-related activities for our ENHANCE and DENOVO clinical trials.
During the year ended December 31, 2024, we acquired eight transplant-related fixed-wing aircraft with an aggregate purchase price of $109.6 million and we plan to acquire additional aircraft in 2025, including two aircraft purchased in January 2025 and February 2025 with an aggregate purchase price of $28.4 million.
We may acquire additional fixed-wing aircraft to enhance our logistics capabilities and support international expansion. During the year ended December 31, 2025, we acquired 3 transplant-related fixed-wing aircraft with an aggregate purchase price of $42.9 million.
Selling, General and Administrative Expenses Year Ended December 31, 2024 2023 Change (in thousands) Personnel related (including stock-based compensation expense) $ 109,475 $ 72,717 $ 36,758 Professional and consultant fees 18,313 17,401 912 NOP support 12,289 11,985 304 Tradeshows and conferences 4,328 4,575 (247 ) Facility related and other 24,212 12,875 11,337 Total selling, general and administrative expenses $ 168,617 $ 119,553 $ 49,064 Total selling, general and administrative expenses increased by $49.1 million from $119.6 million in the year ended December 31, 2023 to $168.6 million in the year ended December 31, 2024 due primarily to increases in personnel related costs, and facility related and other costs.
Facility related and other costs increased by $2.2 million from the year ended December 31, 2024 to the year ended December 31, 2025 due primarily to increased cost of supporting a larger group of research and development personnel. 70 Selling, General and Administrative Expenses Year Ended December 31, 2025 2024 Change (in thousands) Personnel related (including stock-based compensation expense) $ 114,506 $ 109,475 $ 5,031 Professional and consultant fees 25,936 18,313 7,623 NOP support 6,826 12,289 (5,463 ) Tradeshows and conferences 4,316 4,328 (12 ) Facility related and other 33,584 24,212 9,372 Total selling, general and administrative expenses $ 185,168 $ 168,617 $ 16,551 Total selling, general and administrative expenses increased by $16.6 million from $168.6 million in the year ended December 31, 2024 to $185.2 million in the year ended December 31, 2025.
Other Income (Expense) Interest Expense Interest expense was $14.4 million and $10.8 million for the years ending December 31, 2024 and 2023, respectively. The increase was due primarily to interest expense on the $460.0 million principal amount of the Notes, which were issued in May 2023.
Other Income (Expense) Interest Expense Interest expense was $13.8 million and $14.4 million for the years ending December 31, 2025 and 2024, respectively, and consisted of interest expense on the $460.0 million principal amount of the Notes that carry a 1.5% interest rate and interest expense on the $60.0 million principal amount of the CIBC loan that carries a variable interest rate, which was 5.7% as of December 31, 2025.
During the year ended December 31, 2023, net cash provided by financing activities of $400.4 million consisted of net proceeds from the issuance of our Notes of $445.4 million, partially offset by payments of $52.1 million for associated capped calls, proceeds from the issuance of common stock upon exercise of stock options of $6.2 million and proceeds from the issuance of common stock in connection with the 2019 Employee Stock Purchase Plan of $1.0 million.
During the year ended December 31, 2024, net cash used in investing activities of $129.3 million consisted of purchases of property, plant and equipment of $129.7 million, primarily related to the purchase of transplant aircraft. 72 Financing Activities During the year ended December 31, 2025, net cash provided by financing activities of $16.9 million consisted of proceeds from the issuance of common stock upon exercise of stock options of $13.7 million and proceeds from the issuance of common stock in connection with the 2019 Employee Stock Purchase Plan of $3.2 million.
Facility related and other costs increased by $11.3 million due primarily to increased costs associated with post-approval studies and information technology infrastructure costs, and depreciation and amortization expense due to the growth in our business.
We also incurred higher consulting services related to general business initiatives to support our growth. Facility related and other costs increased by $9.4 million due primarily to increased depreciation and amortization and information technology infrastructure costs as well as increases in non-income based state taxes.
We have the right to elect to settle conversions either in cash, shares or in a combination of cash and shares of our common stock. 74 Prior to June 8, 2026, the Notes will not be redeemable.
Prior to June 8, 2026, the Notes will not be redeemable.
Comparison of the Years Ended December 31, 2023 and 2022 For a discussion of our results of operations for the year ended December 31, 2023 as compared to the year ended December 31, 2022, see Item 7.
Our effective tax rate for 2024 differs from the U.S. federal statutory income tax rate of 21.0% primarily due to excess stock compensation deductions, partially offset by state and federal income taxes for the portion of our taxable income that was not offset by operating loss and tax credit carryforwards, and the impact from the change in valuation allowance. 71 Comparison of the Years Ended December 31, 2024 and 2023 For a discussion of our results of operations for the year ended December 31, 2024 as compared to the year ended December 31, 2023, see Item 7.