Biggest changeResults of operations Consolidated results of operations for the year ended December 31, 2024, compared to the year ended December 31, 2023 Year ended December 31, Change (in thousands) 2024 2023 $ % Revenue $ 51,292 $ 39,295 $ 11,997 31 % Cost of goods sold 8,334 6,256 2,078 33 % Gross profit 42,958 33,039 9,919 30 % Gross margin 84 % 84 % Operating Expenses: Research and development 11,131 11,633 (502) (4) % Selling, general and administrative 91,317 64,509 26,808 42 % Total operating expenses 102,448 76,142 26,306 35 % Loss from operations (59,490) (43,103) (16,387) 38 % Interest expense (4,397) (1,799) (2,598) 144 % Other income, net 3,977 3,850 127 3 % Loss before income taxes (59,910) (41,052) (18,858) 46 % Provision for income taxes (55) (147) 92 (63) % Net loss $ (59,965) $ (41,199) $ (18,766) 46 % 76 Table of Contents Revenue Revenue by Geography Year ended December 31, Change (in thousands) 2024 2023 $ % United States $ 47,167 $ 35,111 $ 12,056 34 % Europe 4,125 4,184 (59) (1) % Total Revenue $ 51,292 $ 39,295 $ 11,997 31 % Revenue was $51.3 million for the year ended December 31, 2024, an increase of $12.0 million, or 31%, over the year ended December 31, 2023.
Biggest changeWe maintain a full valuation allowance for deferred tax assets including NOL carryforwards, R&D credits, and other tax credits. 77 Table of Contents Results of operations Consolidated results of operations for the year ended December 31, 2025, compared to the year ended December 31, 2024 Year ended December 31, Change (in thousands) 2025 2024 $ % Revenue $ 56,651 $ 51,292 $ 5,359 10 % Cost of goods sold 8,311 8,334 (23) (0) % Gross profit 48,340 42,958 5,382 13 % Gross margin 85 % 84 % Operating Expenses: Research and development 11,132 11,131 1 0 % Selling, general and administrative 88,473 91,317 (2,844) (3) % Total operating expenses 99,605 102,448 (2,843) (3) % Loss from operations (51,265) (59,490) 8,225 (14) % Interest expense (5,827) (4,397) (1,430) 33 % Other income, net 3,768 3,977 (209) (5) % Loss before income taxes (53,324) (59,910) 6,586 (11) % Benefit (provision) for income taxes 18 (55) 73 (133) % Net loss $ (53,306) $ (59,965) $ 6,659 (11) % Revenue Revenue by Geography Year ended December 31, Change (in thousands) 2025 2024 $ % United States $ 51,883 $ 47,167 $ 4,716 10 % Europe 4,768 4,125 643 16 % Total Revenue $ 56,651 $ 51,292 $ 5,359 10 % Revenue was $56.7 million for the year ended December 31, 2025, an increase of $5.4 million, or 10%, over the year ended December 31, 2024.
Research and development expenses Research and development (“R&D”) expenses consist primarily of personnel costs, including salaries, bonuses, employee benefits and stock-based compensation expenses for our R&D employees. R&D expenses also include costs associated with product design efforts, development prototypes, testing, clinical trial programs and regulatory activities, contractors, and consultants, equipment, and software to support our development, facilities, and information technology.
Research and development expenses Research and development (“R&D”) expenses consist primarily of personnel costs, including salaries, bonuses, employee benefits and stock-based compensation expenses for our R&D employees. R&D expenses also include costs associated with product design efforts, development prototypes, testing, clinical trial programs and regulatory activities, contractors, consultants, equipment, and software to support our development, facilities, and information technology.
We have dedicated significant resources to educate physicians who treat HFrEF about the advantages of Barostim and train them on the implant procedure. The costs for the device and implantation procedure are reimbursed through various third-party payers, such as government agencies and commercial payers.
We have dedicated significant resources to educate physicians and APPs who treat HFrEF about the advantages of Barostim and train them on the implant procedure. The costs for the device and implantation procedure are reimbursed through various third-party payers, such as government agencies and commercial payers.
Other income, net Other income, net consists primarily of interest income on our interest-bearing accounts, partially offset by the effect of exchange rates on our foreign currency-denominated asset and liability balances. Provision for income taxes Provision for income taxes consists primarily of income taxes in foreign jurisdictions in which we conduct business.
Other income, net Other income, net consists primarily of interest income on our interest-bearing accounts, partially offset by the effect of exchange rates on our foreign currency-denominated asset and liability balances. Benefit (provision) for income taxes Benefit (provision) for income taxes consists primarily of income taxes in foreign jurisdictions in which we conduct business.
We expect to derive future revenue by continuing to both expand our own dedicated salesforce and increase awareness of Barostim among payers, physicians, and patients. 73 Table of Contents Our sales and marketing efforts are directed at EPs, HF specialists, interventional and general cardiologists, and vascular surgeons because they are the primary users of our technology.
We expect to derive future revenue by continuing to both expand our own dedicated salesforce and increase awareness of Barostim among payers, physicians, and patients. 74 Table of Contents Our sales and marketing efforts are directed at EPs, HF specialists, interventional and general cardiologists, and vascular surgeons because they are the primary users of our technology.
These factors include: ● Growing and supporting our U.S. commercial organization; ● Promoting awareness among physicians, hospitals, and patients to accelerate adoption of Barostim; ● Continuing to develop and disseminate clinical evidence supporting the benefits of Barostim; 74 Table of Contents ● Raising awareness among payers to build upon reimbursement for Barostim; ● Investing in research and development to foster innovation; and ● Leveraging our manufacturing capacity to further improve our gross margins.
These factors include: ● Growing and supporting our U.S. commercial organization; ● Promoting awareness among physicians, hospitals, and patients to accelerate adoption of Barostim; ● Continuing to develop and disseminate clinical evidence supporting the benefits of Barostim; ● Raising awareness among payers to build upon reimbursement for Barostim; ● Investing in research and development to foster innovation; and ● Leveraging our manufacturing capacity to further improve our gross margins.
We believe that our existing cash resources together with cash from operations will be sufficient to meet our forecasted requirements for operating liquidity, capital expenditures and debt services for at least the next three years.
We believe that our existing cash resources together with cash from operations will be sufficient to meet our forecasted requirements for operating liquidity, capital expenditures and debt services for at least the next two years.
We expect cost of goods sold to increase in absolute dollars primarily as, and to the extent, our revenue grows. Gross margin may also vary based on regional differences in rebates and incentives negotiated with certain customers. We calculate gross margin as revenue less cost of goods sold divided by revenue.
We expect cost of goods sold to increase in absolute dollars primarily as, and to the extent, our revenue grows. Gross margin may also vary based on regional differences in rebates and incentives negotiated with certain customers. 76 Table of Contents We calculate gross margin as revenue less cost of goods sold divided by revenue.
We expense R&D costs as they are incurred. We expect R&D expenses to increase in absolute dollars as we continue to develop enhancements to Barostim. Our 75 Table of Contents R&D expenses may fluctuate from period to period due to the timing and extent of our product development and clinical trial expenses.
We expense R&D costs as they are incurred. We expect R&D expenses to increase in absolute dollars as we continue to develop enhancements to Barostim. Our R&D expenses may fluctuate from period to period due to the timing and extent of our product development and clinical trial expenses.
Stock-based compensation We maintain an equity incentive plan that was adopted in 2001 to provide long-term incentives for employees, consultants, and members of the Board of Directors. The plan allows for the issuance of non-statutory and 80 Table of Contents incentive stock options to employees and non-statutory stock options to consultants and non-employee directors.
Stock-based compensation We maintain an equity incentive plan that was adopted in 2001 to provide long-term incentives for employees, consultants, and members of the Board of Directors. The plan allows for the issuance of non-statutory and incentive stock options to employees and non-statutory stock options to consultants and non-employee directors.
Our gross margin has been and will continue to be affected by a variety of factors, but is primarily driven by the average sale price of our product, the percentage of products sold that include a full system (i.e., an IPG and a stimulation lead), as compared to individual IPG sales, and the allocated manufacturing overhead.
Our gross margin has been and will continue to be affected by a variety of factors, but is primarily driven by the ASP of our product, the percentage of products sold that include a full system (i.e., an IPG and a stimulation lead), as compared to individual IPG sales, and the allocated manufacturing overhead.
Approximately $8.4 million of the increase in non-cash stock-based compensation expense is related to the modification of stock options held by our 77 Table of Contents former Chief Executive Officer in connection with his retirement in the first quarter of 2024 described in Note 7 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.
Approximately $8.4 million of the decrease in non-cash stock-based compensation expense is related to the modification of stock options held by our former Chief Executive Officer in connection with his retirement in the first quarter of 2024 described in Note 7 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.
Cash provided by financing activities: Net cash provided by financing activities for the year ended December 31, 2024 was $55.9 million and consisted of $32.5 million related to proceeds from the issuance of common stock through the ATM offering, $20.0 million related to proceeds under the Loan Agreement, $2.7 million related to proceeds from the exercise of common stock options, and $0.8 million related to proceeds from the Employee Stock Purchase Plan (“ESPP”), partially offset by $0.2 million related to debt financing costs.
Net cash provided by financing activities for the year ended December 31, 2024 was $55.9 million and consisted of $32.5 million related to proceeds from the issuance of common stock through the ATM offering, $20.0 million related to proceeds under the Loan Agreement, $2.7 million related to proceeds from the exercise of common stock options, and $0.8 million related to proceeds from the ESPP, partially offset by $0.2 million related to debt financing costs.
We had $50.0 million in outstanding Term Loans under the Loan Agreement at December 31, 2024. On November 4, 2022, we entered into an Equity Distribution Agreement with Piper Sandler & Co., as agent, under which we may offer and sell, from time to time at our sole discretion, shares of our common stock having an aggregate offering price of up to $50.0 million in an “at-the-market” (“ATM”) offering, to or through the agent.
We had $50.0 million in outstanding Term Loans under the Loan Agreement at December 31, 2025. On November 4, 2022, we entered into an Equity Distribution Agreement with Piper Sandler & Co., as agent, under which we may offer and sell, from time to time at our sole discretion, shares of our common stock having an aggregate offering price of up to $50.0 million in an ATM offering, to or through the agent.
Indebtedness On October 31, 2022, we entered into the Loan Agreement with Innovatus, as the collateral agent and a lender, under which we may borrow, subject to our achievement of certain milestones, up to a total of $50.0 million in a series of term loans.
Indebtedness On October 31, 2022, we entered into the Loan Agreement with Innovatus, as the collateral agent and a lender, allowing us to borrow, subject to our achievement of certain milestones, up to a total of $50.0 million in a series of term loans.
On October 31, 2022, we entered into the Loan Agreement under which we may borrow, subject to our achievement of certain milestones, up to a total of $50.0 million in a series of Term Loans described in Note 4 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.
On October 31, 2022, we entered into the Loan Agreement allowing borrowing subject to our achievement of certain milestones, up to a total of $50.0 million in a series of Term Loans described in Note 4 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.
Liquidity, capital resources and plan of operations We have incurred significant operating losses and negative cash flows from operations since our inception, and we anticipate that we will incur significant losses for at least the next several years. As of December 31, 2024 and 2023, we had cash and cash equivalents of $105.9 million and $90.6 million, respectively.
Liquidity, capital resources and plan of operations We have incurred significant operating losses and negative cash flows from operations since our inception, and we anticipate that we will incur significant losses for at least the next several years. As of December 31, 2025 and 2024, we had cash and cash equivalents of $75.7 million and $105.9 million, respectively.
In January 2024, we commenced this ATM offering and issued 3,251,198 shares of common stock for gross proceeds of $33.8 million under the ATM offering during the year ended December 31, 2024.
In January 2024, we commenced this ATM offering and issued 3,251,198 shares of common stock for gross proceeds of $33.8 million under the ATM offering during the year ended December 31, 2024. We issued 543,462 shares of common stock for gross proceeds of $9.5 million during the year ended December 31, 2025.
Other income, net Other income, net was $4.0 million for the year ended December 31, 2024, compared to $3.9 million for the year ended December 31, 2023. This increase was primarily driven by greater interest income on our interest-bearing accounts. Provision for income taxes Provision for income taxes was nominal for the years ended December 31, 2024 and 2023.
Other income, net Other income, net was $3.8 million for the year ended December 31, 2025, compared to $4.0 million for the year ended December 31, 2024. This decrease was primarily driven by less interest income on our interest-bearing accounts . Provision for income taxes Provision for income taxes was nominal for the years ended December 31, 2025 and 2024.
Net cash used in operating activities for the year ended December 31, 2023 was $39.0 million and consisted primarily of a net loss of $41.2 million and a decrease in net operating assets of $4.8 million, partially offset by $6.3 million from non-cash stock-based compensation expense, $0.5 million from the depreciation of property and equipment and $0.2 million from amortization of deferred financing costs and loan discount.
Net cash used in operating activities for the year ended December 31, 2024 was $39.1 million and consisted primarily of a net loss of $60.0 million, partially offset by $19.1 million from non-cash stock-based compensation expense, an increase in net operating assets of $0.9 million, $0.6 million from the depreciation of property and equipment, and $0.2 million from amortization of deferred financing costs and loan discount.
As of December 31, 2024, we had a total of 223 active implanting centers in the U.S., as compared to 178 as of December 31, 2023. Active implanting centers are customers that have completed at least one commercial HF implant in the last 12 months.
Active implanting centers are customers that have completed at least one commercial HF implant in the last 12 months. As of December 31, 2025, we had 53 sales territories in the U.S. as compared to 48 sales territories as of December 31, 2024.
We have remaining capacity to issue and sell up to $16.2 million of additional shares of common stock under this ATM offering. Our future liquidity and capital funding requirements will depend on numerous factors, including: ● our investment in our U.S. commercial infrastructure and sales forces; ● the degree and rate of market acceptance of Barostim and the ability for our customers to obtain appropriate levels of reimbursement; ● the costs of commercialization activities, including product sales, marketing, manufacturing, and distribution; ● our R&D activities for product enhancements and to expand our indications; 78 Table of Contents ● the costs of filing, prosecuting, defending, and enforcing any patent claims and other intellectual property rights; ● our need to implement additional infrastructure and internal systems; ● our ability to hire additional personnel to support our operations as a public company; and ● the emergence of competing technologies or other adverse market developments.
Pursuant to the terms of the Sale Agreement, we may offer and sell, from time to time at our sole discretion, shares of common stock having an aggregate offering price up to $50.0 million in an ATM offering, to or through the agent. Our future liquidity and capital funding requirements will depend on numerous factors, including: ● our investment in our U.S. commercial infrastructure and sales forces; ● the degree and rate of market acceptance of Barostim and the ability for our customers to obtain appropriate levels of reimbursement; ● the costs of commercialization activities, including product sales, marketing, manufacturing, and distribution; ● our R&D activities for product enhancements and to expand our indications; ● the costs of filing, prosecuting, defending, and enforcing any patent claims and other intellectual property rights; ● our need to implement additional infrastructure and internal systems; ● our ability to hire additional personnel to support our operations as a public company; and ● the emergence of competing technologies or other adverse market developments.
This change was driven by a $12.7 million increase in non-cash stock-based compensation expense, an $11.0 million increase in compensation expenses, mainly as a result of increased headcount, a $1.3 million increase in travel expenses, a $0.6 million increase in bad debt expenses, and a $0.5 million increase in consulting expenses.
This change was driven by a $7.9 million decrease in non-cash stock-based compensation expense, a $0.2 million decrease in insurance expenses, and a $0.2 million decrease in bad debt expense, partially offset by a $4.0 million increase in compensation expenses, mainly as a result of increased headcount and a $1.5 million increase in travel expenses.
On October 31, 2022, we entered into the Loan Agreement under which we may borrow, subject to our achievement of certain milestones, up to a total of $50.0 million in a series of Term Loans described in Note 4 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.
Our net cash used in operating activities for the years ended December 31, 2025 and 2024 was $40.2 million and $39.1 million, respectively. 79 Table of Contents On October 31, 2022, we entered into the Loan Agreement under which we may borrow, subject to our achievement of certain milestones, up to a total of $50.0 million in a series of Term Loans described in Note 4 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.
Selling, general and administrative expenses SG&A expenses increased $26.8 million, or 42%, to $91.3 million for the year ended December 31, 2024, compared to the year ended December 31, 2023.
Selling, general and administrative expenses SG&A expenses decreased $2.8 million, or 3%, to $88.5 million for the year ended December 31, 2025, compared to the year ended December 31, 2024.
As a result, our financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective dates for new or revised accounting standards that are applicable to public companies, which may make comparison of our financials to those of other public companies more difficult. 81 Table of Contents Recent accounting pronouncements A discussion of recent accounting pronouncements is included in Note 2 to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.
As a result, our financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective dates for new or revised accounting standards that are applicable to public companies, which may make comparison of our financials to those of other public companies more difficult.
As of December 31, 2024, we had five sales territories in Europe as compared to six sales territories as of December 31, 2023. Cost of goods sold and gross margin Cost of goods sold increased $2.1 million, or 33%, to $8.3 million for the year ended December 31, 2024, compared to the year ended December 31, 2023.
As of December 31, 2025 and December 31, 2024, we had five sales territories in Europe. 78 Table of Contents Cost of goods sold and gross margin Cost of goods sold decreased $23,000 to $8.3 million for the year ended December 31, 2025, compared to the year ended December 31, 2024.
The APC payment of approximately $45,000 will continue in 2025, as published in the 2025 OPPS final rule. Factors affecting our performance We believe there are several important factors that have impacted and that we expect will continue to impact our business and results of operations.
Factors affecting our performance We believe there are several important factors that have impacted and that we expect will continue to impact our business and results of operations.
In connection with the IPO, we adopted the 2021 Equity Incentive Plan under which we may grant equity incentive awards to eligible employees (including our named executive officers), non-employee directors and consultants in order to enable us to obtain and retain services of these individuals, which we deem as essential to our long-term success.
In connection with the IPO, we adopted the 2021 Equity Incentive Plan under which we may grant equity incentive awards to eligible employees (including our named executive officers), non-employee directors and consultants in order to enable us to obtain and retain services of these individuals, which we deem as essential to our long-term success. 82 Table of Contents We recognize equity-based compensation expense for awards of equity instruments to employees and non-employees based on the grant date fair value of those awards in accordance with Financial Accounting Standards Board Accounting Standards Codification Topic 718, Compensation—Stock Compensation (“ASC 718”).
Cash flows The following table sets forth the primary sources and uses of cash for each of the periods presented below: Year ended December 31 (in thousands) 2024 2023 Net cash (used in) provided by: Operating activities $ (39,144) $ (39,021) Investing activities (1,361) (591) Financing activities 55,870 23,984 Effect of currency exchange on cash and cash equivalents (1) 3 Net change in cash and cash equivalents $ 15,364 $ (15,625) Cash used in operating activities Net cash used in operating activities for the year ended December 31, 2024 was $39.1 million and consisted primarily of a net loss of $60.0 million, partially offset by $19.1 million from non-cash stock-based compensation expense, an increase in net operating assets of $0.9 million, $0.6 million from the depreciation of property and equipment, and $0.2 million from amortization of deferred financing costs and loan discount.
If we are unable to obtain additional financing when needed to satisfy our liquidity requirements, we may be required to delay the commercialization and marketing of Barostim. 80 Table of Contents Cash flows The following table sets forth the primary sources and uses of cash for each of the periods presented below: Year ended December 31 (in thousands) 2025 2024 Net cash (used in) provided by: Operating activities $ (40,170) $ (39,144) Investing activities (580) (1,361) Financing activities 10,520 55,870 Effect of currency exchange on cash and cash equivalents 5 (1) Net change in cash and cash equivalents $ (30,225) $ 15,364 Cash used in operating activities Net cash used in operating activities for the year ended December 31, 2025 was $40.2 million and consisted primarily of a net loss of $53.3 million, partially offset by $11.1 million from non-cash stock-based compensation expense, an increase in net operating assets of $1.0 million, $0.8 million from the depreciation of property and equipment, $0.2 million from amortization of deferred financing costs and loan discount, and $0.1 million from the disposal of equipment.
Revenue generated in the U.S. was $47.2 million for the year ended December 31, 2024, an increase of $12.1 million, or 34%, over the year ended December 31, 2023. HF revenue units in the U.S. totaled 1,506 and 1,123 for the years ended December 31, 2024 and 2023, respectively.
Revenue generated in the U.S. was $51.9 million for the year ended December 31, 2025, an increase of $4.7 million, or 10%, over the year ended December 31, 2024. Revenue units in the U.S. totaled 1,648 and 1,522 for the years ended December 31, 2025 and 2024, respectively.
As a result of these investments and our commercialization efforts, we expect to continue to incur net losses for the next several years, which may require additional funding and could include future equity and debt financing. Recent developments On November 4, 2024, we announced that CMS assigned the Barostim procedure to New Technology APC 1580.
As a result of the planned investments and to fund our commercialization efforts, we expect to continue to incur net losses for the next several years, which may require additional funding and could include future equity and debt financing. Recent developments In October 2025, the CMS released the final 2026 Medicare Physician Fee Schedule.
Net cash provided by financing activities for the year ended December 31, 2023 was $24.0 million and consisted of $22.5 million related to proceeds from debt financing, $0.9 million related to proceeds from the ESPP and $0.7 million related to proceeds from the exercise of common stock options, partially offset by debt financing costs of $0.2 million.
Cash provided by financing activities: Net cash provided by financing activities for the year ended December 31, 2025 was $10.5 million and consisted of $9.0 million related to proceeds from the issuance of common stock through the ATM offering, $0.8 million related to proceeds from the exercise of common stock options, and $0.8 million related to proceeds from the Employee Stock Purchase Plan (“ESPP”).
HF revenue in the U.S. totaled $46.8 million and $34.6 million for the years ended December 31, 2024 and 2023, respectively. The increase was primarily driven by continued growth as a result of the expansion into new sales territories and new accounts, as well as increased physician and patient awareness of Barostim.
The increase was primarily driven by continued growth as a result of the expansion into new sales territories and new accounts, as well as increased physician and patient awareness of Barostim. As of December 31, 2025, we had a total of 252 active implanting centers in the U.S., as compared to 223 as of December 31, 2024.
Interest expense Interest expense increased $2.6 million to $4.4 million for the year ended December 31, 2024, compared to the year ended December 31, 2023. This increase was driven by the interest expense on higher levels of borrowings under the Loan Agreement entered into on October 31, 2022.
Interest expense Interest expense increased $1.4 million to $5.8 million for the year ended December 31, 2025, compared to the year ended December 31, 2024. This increase was driven by the interest expense on borrowings under the Term Loan Agreement with Innovatus Capital Partners.
On September 30, 2024, we borrowed the remaining $20.0 million under the third and final tranche of the Loan Agreement. The term loans advanced pursuant to the Loan Agreement (collectively, the “Term Loans”) bear interest at a floating rate per annum equal to the sum of (a) the greater of (i) the prime rate and (ii) 5.50% plus (b) 2.65%.
Initially, the term loans advanced pursuant to the Loan Agreement (collectively, the “Term Loans”) bore interest at a floating rate per annum equal to the sum of (a) the greater of (i) the prime 81 Table of Contents rate and (ii) 5.50%; plus (b) 2.65%. On January 9, 2026, we entered into an Amendment to our existing Loan Agreement.
We had $50.0 million in outstanding Term Loans under the Loan Agreement at December 31, 2024.
We had $50.0 million in outstanding Term Loans under the Loan Agreement as of December 31, 2025. On the closing date of the Amendment, we borrowed an additional $10.0 million under the Loan Agreement.
For the years ended December 31, 2024 and 2023, our net losses were $60.0 million and $41.2 million, respectively. Our net cash used in operating activities for the years ended December 31, 2024 and 2023 was $39.1 million and $39.0 million, respectively.
For the years ended December 31, 2025 and 2024, our net losses were $53.3 million and $60.0 million, respectively.
Additional financing may not be available at all or may only be available in amounts or on terms that we do not deem to be favorable. If we are unable to obtain additional financing when needed to satisfy our liquidity requirements, we may be required to delay the commercialization and marketing of Barostim.
Additional financing may not be available at all or may only be available in amounts or on terms that we do not deem to be favorable.
Net operating assets consisted primarily of inventory, accounts receivable, prepaid expenses and other current assets, accrued expenses to support the growth of our operations and accounts payable. 79 Table of Contents Cash used in investing activities: Cash used in investing activities was $1.4 million and $0.6 million for the years ended December 31, 2024 and 2023, respectively, and consisted of purchases of property and equipment.
Cash used in investing activities: Cash used in investing activities was $0.6 million and $1.4 million for the years ended December 31, 2025 and 2024, respectively, and consisted of purchases of property and equipment.
Total revenue units in Europe decreased to 204 for the year ended December 31, 2024, from 207 for the prior year.
Revenue generated in Europe was $4.8 million for the year ended December 31, 2025, an increase of $0.6 million, or 16%, over the year ended December 31, 2024. Total revenue units in Europe increased to 219 for the year ended December 31, 2025, from 204 for the prior year.
Research and development expenses R&D expenses decreased $0.5 million, or 4%, to $11.1 million for the year ended December 31, 2024, compared to the year ended December 31, 2023.
Research and development expenses R&D expenses were $11.1 million for the years ended December 31, 2025 and December 31, 2024, respectively. R&D expense for the year ended December 31, 2025 included a $0.4 million increase in compensation expenses, mainly as a result of increased headcount, offset by a $0.5 million decrease in clinical study expenses.
A performance covenant took effect upon the third tranche funding, requiring that we achieve 50% of the trailing twelve months revenue target set in the Board-approved revenue plan in effect for such period. Critical accounting policies and estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires our management to make estimates and judgments that affect the amounts reported in our consolidated financial statements and accompanying notes included elsewhere in this Annual Report on Form 10-K.
The Loan Agreement requires the payment of certain penalties if the Term Loans are paid off prior to maturity for any reason, including pursuant to an acceleration clause, and includes various restrictive covenants, including a restriction on the payment of dividends or making other distributions or payments on our capital stock, subject to limited exceptions. Critical accounting policies and estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires our management to make estimates and judgments that affect the amounts reported in our consolidated financial statements and accompanying notes included elsewhere in this Annual Report on Form 10-K.
This increase was primarily due to higher sales of Barostim. Gross profit was $43.0 million for the year ended December 31, 2024, an increase of $9.9 million, or 30%, over the year ended December 31, 2023. Gross margin was 84% for both the years ended December 31, 2024 and 2023.
This decrease was driven by a lower cost per unit, primarily due to an increase in manufacturing efficiencies. Gross profit was $48.3 million for the year ended December 31, 2025, an increase of $5.4 million, or 13%, over the year ended December 31, 2024.
On the closing date, we borrowed the minimum amount of $7.5 million under the Loan Agreement. On March 10, 2023, we borrowed the $7.5 million remaining under the first tranche of the Loan Agreement. On December 15, 2023, we borrowed $15.0 million under the second tranche of the Loan Agreement.
We had $50.0 million in outstanding principal amount of Term Loans under the Loan Agreement at December 31, 2025 and, on the closing date of the Amendment, we borrowed an additional $10.0 million.