Biggest changeWe believe that our existing funds, cash generated from our operations and our existing sources of and access to financing are adequate to satisfy our needs for working capital, capital expenditure, debt service requirements and other business initiatives we plan to strategically pursue. 42 Table of Contents Summary of Cash Flows The following is a summary of cash (used in) provided by operating, investing, and financing activities, the effect of exchange rate changes on cash and cash equivalents, and the net change in cash and cash equivalents: Year Ended December 31, 2023 2022 2021 Cash (used in) provided by: Operating activities $ (78,485 ) $ (75,134 ) $ (73,317 ) Investing activities (141,975 ) (58,280 ) (157,762 ) Financing activities 356,919 31,228 311,966 Effect of exchange rate changes on cash (185 ) (366 ) (1,404 ) Net change in cash and cash equivalents $ 136,274 $ (102,552 ) $ 79,483 Operating Activities We used net cash of $78.5 million from operating activities for the year ended December 31, 2023.
Biggest changeSummary of Cash Flows The following is a summary of cash (used in) provided by operating, investing, and financing activities, the effect of exchange rate changes on cash and cash equivalents, and the net change in cash and cash equivalents: Year Ended December 31, 2024 2023 2022 Cash (used in) provided by: Operating activities $ (44,651 ) $ (78,485 ) $ (75,134 ) Investing activities (93,136 ) (141,975 ) (58,280 ) Financing activities 56,208 356,919 31,228 Effect of exchange rate changes on cash (551 ) (185 ) (366 ) Net change in cash and cash equivalents $ (82,130 ) $ 136,274 $ (102,552 ) 40 Table of Contents Operating Activities We used net cash of $44.7 million from operating activities for the year ended December 31, 2024.
We derive our revenue primarily from the sale of spinal surgery implants used in the treatment of spine disorders as well as the sale of medical imaging equipment which is used for surgical planning and post-operative assessment. Spinal implant products include pedicle screws and complementary implants, interbody devices, plates, and tissue-based materials.
We derive our revenue primarily from the sale of spinal surgery implants used in the treatment of spine disorders, as well as from the sale of medical imaging equipment which is used for surgical planning and post-operative assessment. Spinal implant products include pedicle screws and complementary implants, interbody devices, plates, and tissue-based materials.
The preparation of these financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures. On an on-going basis, we evaluate our estimates and assumptions, including those related to revenue recognition, allowances for accounts receivable, inventories and intangible assets, stock-based compensation and income taxes.
The preparation of these financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures. On an on-going basis, we evaluate our estimates and assumptions, including those related to revenue recognition, allowances for accounts receivable, inventories, intangible assets, stock-based compensation, and income taxes.
Costs incurred by us associated with sales contracts with customers are deferred over the performance obligation period and recognized in the same period as the related revenue, except for contracts that complete within one year or less, in which case the associated costs are expensed as incurred.
Costs incurred by us associated directly with sales contracts with customers are deferred over the performance obligation period and recognized in the same period as the related revenue, except for contracts that complete within one year or less, in which case the associated costs are expensed as incurred.
The application of our team’s deep spine know-how, coupled with a willingness to invest holistically in each of the technologies integrated into all of ATEC’s procedural approaches continues to increasingly compel surgeons and sales talent to partner with us.
The application of our team’s deep spine know-how, coupled with a willingness to invest holistically in each of the technologies integrated into all of our procedural approaches continues to increasingly compel surgeons and sales talent to partner with us.
If our actual results, or the plans and estimates used in future impairment analyses, are lower than the original estimates used to assess the recoverability of these assets, we could incur additional impairment charges. 46 Table of Contents In-process research and development ("IPR&D") and software in development have indefinite lives and are not amortized until the related products reach full commercial launch or when the projects are complete and their assets are ready for their intended use.
If our actual results, or the plans and estimates used in future impairment analyses, are lower than the original estimates used to assess the recoverability of these assets, we could incur additional impairment charges. 44 Table of Contents In-process research and development ("IPR&D") and software in development have indefinite lives and are not amortized until the related products reach full commercial launch or when the projects are complete and their assets are ready for their intended use.
Revenue from the sale of imaging equipment is recognized as each distinct performance obligation is fulfilled and control transfers to the customer, beginning with shipment or delivery, depending on the terms.
Revenue from the sale of imaging equipment is recognized as each distinct performance obligation is fulfilled and control transfers to the customer, beginning with shipment or delivery, depending on the contract terms.
Sales, general and administrative expenses consist primarily of salaries and related employee benefits, sales commissions and other variable costs, depreciation of our surgical instruments, regulatory affairs, quality assurance costs, professional service fees, travel, medical education, trade show and marketing costs, and insurance expenses. Litigation-related expenses. Litigation-related expenses are costs incurred for our ongoing and settled litigation.
Sales, general and administrative expenses consist primarily of salaries and related employee benefits, sales commissions and other variable costs, depreciation of our surgical instruments, regulatory affairs, quality assurance costs, professional service fees, travel, medical education, trade show and marketing costs, and insurance expenses. Litigation-related expenses. Litigation-related expenses are costs incurred for our ongoing and settled litigation. Amortization expense.
The Revolving Credit Facility matures on the earlier of September 29, 2027, or 90 days prior to the final maturity date of any of our outstanding 0.75% Convertible Senior Notes due 2026 (the "2026 Notes"). As of December 31, 2023, we had $316.3 million outstanding under the 2026 Notes.
The Revolving Credit Facility matures on the earlier of September 29, 2027, or 90 days prior to the final maturity date of any of our outstanding 0.75% Convertible Senior Notes due 2026 (the "2026 Notes"). As of December 31, 2024, we had $316.3 million outstanding under the 2026 Notes.
Specialized implants, fixation products, and biologics are determined by utilizing a standard cost method, which includes capitalized variances, which approximates the weighted average cost. Imaging equipment and related parts are valued at weighted average cost. Inventories are stated at the lower of cost or net realizable value.
Specialized implants, fixation products, biologics, and imaging equipment are determined by utilizing a standard cost method, which includes capitalized variances, which approximates the weighted average cost. Component parts related to the imaging equipment are valued at weighted average cost. Inventories are stated at the lower of cost or net realizable value.
The use of alternative estimates could result in a different amount of revenue deferral. 45 Table of Contents Excess and Obsolete Inventory Most of our inventory is comprised of finished goods, and we primarily utilize third-party suppliers to produce our products.
The use of alternative estimates could result in a different amount of revenue deferral. 43 Table of Contents Excess and Obsolete Inventory Most of our inventory is comprised of finished goods, and we primarily utilize third-party suppliers to produce our products.
For discussion regarding our financial condition and the results of operations for 2022 compared to 2021, refer to Part II, Item 7 Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report on Form 10-K for the year ended December 31, 2022.
For discussion regarding our financial condition and the results of operations for 2023 compared to 2022, refer to Part II, Item 7 Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report on Form 10-K for the year ended December 31, 2023.
See “ Notes to Financial Statements - Note 1 - Recently Adopted and Issued Accounting Pronouncements ” included elsewhere in this Annual Report on Form 10-K. 47 Table of Contents
See “ Notes to Financial Statements - Note 1 - Recently Adopted and Issued Accounting Pronouncements ” included elsewhere in this Annual Report on Form 10-K. 45 Table of Contents
We believe the following accounting policies to be critical to the judgments and estimates used in the preparation of our consolidated financial statements. 44 Table of Contents Revenue Recognition We recognize revenue from product sales in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Revenue from Contracts with Customers (“Topic 606”).
We believe the following accounting policies to be critical to the judgments and estimates used in the preparation of our consolidated financial statements. 42 Table of Contents Revenue Recognition We recognize revenue from product sales in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification Revenue from Contracts with Customers (“Topic 606”).
A discussion regarding our financial condition and results of operations for 2023 compared to 2022 is presented under “Results of Operations” further below in this Item 7.
A discussion regarding our financial condition and results of operations for 2024 compared to 2023 is presented under “Results of Operations” further below in this Item 7.
We incur royalties related to the technologies that we license from others and the products that are developed in part by surgeons with whom we collaborate in the product development process. Research and development expenses . Research and development expenses consist of costs associated with the design, development, testing, and enhancement of our products.
We incur royalties related to the technologies that we license from others and the products that are developed in part by surgeons with whom we collaborate in the product development process. 36 Table of Contents Research and development expenses . Research and development expenses consist of costs associated with the design, development, testing, and enhancement of our products.
Valuation of Intangible Assets Our intangible assets are comprised primarily of purchased technology, customer relationships, trade name, trademarks, and in-process research and development. We make significant judgments in relation to the valuation of intangible assets resulting from business combinations and asset acquisitions.
Valuation of Intangible Assets Our intangible assets are comprised primarily of purchased technology, internally developed software, customer relationships, trade name, trademarks, and in-process research and development. We make significant judgments in relation to the valuation of intangible assets resulting from business combinations and asset acquisitions.
By applying our unique, 100% spine focus and deep, collective industry know-how, we aim to revolutionize the approach to spine surgery through clinical distinction. The sophisticated approaches that we create from the ground up integrate with our expanding Alpha InformatiX product platform to objectively inform surgery and achieve the goals of spine surgery more predictably and more reproducibly.
By applying our unique, 100% spine focus and deep industry know-how, we aim to revolutionize spine surgery through clinical distinction. The sophisticated approaches that we create from the ground up integrate with our expanding Alpha InformatiX ("AIX") platform to objectively inform surgery and achieve the goals of spine surgery more predictably and more reproducibly.
The increase was primarily due to an increase in product volume and an increase in stock-based compensation. We have entered into Development Service Agreements for the development of a wide variety of potential products and intellectual property.
The increase was primarily due to an increase in product volume offset by a decrease in stock-based compensation. We have entered into Development Service Agreements for the development of a wide variety of potential products and intellectual property.
Under these agreements, future payments for product and/or intellectual property rights may be paid in either cash or restricted shares of our common stock at the election of the developer, depending on the terms of the agreement. Certain of these agreements have been amended to remove the cash option and require settlement in restricted shares of our common stock.
Under these agreements, future royalty payments for product and/or intellectual property rights may be paid in either cash or restricted shares of our common stock at the election of the developer, depending on the terms of the agreement. Certain of these agreements were amended to remove the cash royalty option and require settlement in restricted shares of our common stock.
The decrease was primarily related to a decrease in legal fees associated with our previously settled litigation matters. Refer to Note 7 of our Notes to Consolidated Financial Statements included elsewhere in this Annual Report on Form 10-K for further information regarding litigation matters. Amortization of acquired intangible assets.
The decrease was primarily related to a decrease in legal fees associated with our previously settled litigation matters. Refer to Note 7 of our Notes to Consolidated Financial Statements included elsewhere in this Annual Report on Form 10-K for further information regarding litigation matters. Amortization expense.
We have a comprehensive product portfolio designed to address the spine’s various pathologies, and are perpetually innovating to accomplish our ultimate vision, which is to be the standard bearer in spine.
We have a comprehensive product portfolio designed to address the spine’s various pathologies and we are perpetually innovating to accomplish our vision to be the standard bearer in spine.
Based on the terms, we have the option to pay or deliver cash, shares of our common stock, or a combination thereof, when a conversion notice is received. As of December 31, 2023, we had $4.5 million in other debts that are due in monthly and quarterly installments through maturity in 2027.
Based on the terms, we have the option to pay or deliver cash, shares of our common stock, or a combination thereof, when a conversion notice is received. As of December 31, 2024, we had $3.0 million in other debts that are due in monthly and quarterly installments through maturity in 2027.
Sales, general and administrative expenses. Sales, general and administrative expenses increased by $74.1 million, or 25%, during the year ended December 31, 2023, compared to the year ended December 31, 2022. The increase was primarily due to higher compensation-related costs and variable selling expenses associated with the increase in revenue, and our continued investment in building our strategic sales channel.
Sales, general and administrative expenses. Sales, general and administrative expenses increased by $76.1 million, or 20%, during the year ended December 31, 2024, compared to the year ended December 31, 2023. The increase was primarily due to higher compensation-related costs and variable selling expenses associated with the increase in revenue, and our continued investment in building our strategic sales channel.
Additionally, we have increased our investment in our sales and marketing functions by increasing headcount to support the growth of our business. Litigation-related expenses. Litigation-related expenses decreased by $1.7 million, or 7%, during the year ended December 31, 2023, compared to the year ended December 31, 2022.
Additionally, we have increased our investment in our sales and marketing functions by increasing headcount to support the growth of our business. Litigation-related expenses. Litigation-related expenses decreased by $12.5 million, or 56%, during the year ended December 31, 2024, compared to the year ended December 31, 2023.
Investing Activities We used cash of $142.0 million in investing activities for the year ended December 31, 2023, which is primarily related to the acquisition of Valence and purchase of surgical instruments to support the commercial launch of new products and growth of our business.
Investing Activities We used cash of $93.1 million in investing activities for the year ended December 31, 2024, which is primarily related to the purchase of surgical instruments to support the growth of our business and commercial launch of new products.
Cash and cash equivalents were $221.0 million and $84.7 million at December 31, 2023 and December 31, 2022, respectively. We have available borrowings under the Revolving Credit Facility discussed above.
Cash and cash equivalents were $138.8 million and $221.0 million at December 31, 2024 and December 31, 2023, respectively. We have available borrowings under the Revolving Credit Facility discussed above.
Debt and Commitments As of December 31, 2023, we had $150.0 million outstanding under the Braidwell Term Loan. The outstanding loans under the Braidwell Term Loan bear interest at the sum of SOFR plus 5.75% per annum. The Braidwell Term Loan matures on January 6, 2028.
The outstanding loans under the Braidwell Term Loan bear interest at the sum of SOFR plus 5.75% per annum. The Braidwell Term Loan matures on January 6, 2028. As of December 31, 2024, we had $63.3 million outstanding under the Revolving Credit Facility. The outstanding loans bear interest at the sum of SOFR plus 3.5% per annum.
To deliver consistent, predictable growth, we have added, and intend to continue to add, clinically astute and exclusive sales team members to reach untapped surgeons, hospitals, and national accounts and better penetrate existing accounts and territories.
To deliver consistent, predictable growth, we have added, and intend to continue to add, clinically astute and exclusive sales team members to reach untapped surgeons, hospitals, and national accounts and better penetrate existing accounts and territories. Revenue and Expense Components The following is a description of the primary components of our revenue and expenses: Revenue.
As part of our liquidity strategy, we will continue to monitor our current level of spending and cash use as well as our ability to secure additional credit facilities, term loans, or other similar arrangements in light of our spending levels and general financial market conditions.
As part of our liquidity strategy, we will continue to monitor our current level of spending and cash use as well as our ability to secure additional credit facilities, term loans, or other similar arrangements in light of our spending levels and general financial market conditions. 39 Table of Contents A substantial portion of our operations are in the U.S., and most of our net sales have been made in the U.S.
Our liquidity and capital structure are evaluated regularly within the context of our annual operating and strategic planning process. We consider the liquidity necessary to fund our operations, which includes working capital needs, investments in research and development, investments in inventory and instrument sets to support our customers, as well as other operating costs.
We consider the liquidity necessary to fund our operations, which includes working capital needs, investments in research and development, investments in our sales channel and expansion, investments in inventory and instrument sets to support our customers, as well as other operating costs.
Amortization of acquired intangible assets. Amortization of acquired intangible assets consists of intangible assets acquired in business combinations and asset purchases. Transaction-related expenses. Transaction-related expenses consist of certain costs incurred related primarily to the acquisition and integration of Valence. 39 Table of Contents Restructuring expenses .
Amortization expense includes amortization of acquired intangible assets and amortization of internally-developed software that has been placed in service. Amortization of acquired intangible assets consists of intangible assets acquired in business combinations and asset purchases. Transaction-related expenses. Transaction-related expenses consist of certain costs incurred related primarily to the acquisition and integration of Valence. Restructuring expenses .
Under Topic 606, an entity recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration that the entity expects to receive in exchange for those goods or services.
This standard applies to all contracts with customers, except for contracts that are within the scope of other standards, such as leases. Under Topic 606, an entity recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration that the entity expects to receive in exchange for those goods or services.
We only apply the five-step model to contracts when it is probable that we will collect the consideration we are entitled to in exchange for the goods or services that we transfer to the customer.
We only apply the five-step model to contracts when it is probable that we will collect the consideration we are entitled to in exchange for the goods or services that we transfer to the customer. Sales are derived primarily from the sale of spinal implant products, imaging equipment, and related services to hospitals and medical centers.
However, as our business in markets outside of the U.S. continues to increase, we will be exposed to foreign currency exchange risk related to our foreign operations. We do not have any material financial exposure to one customer or one country that would significantly hinder our liquidity.
Accordingly, we do not have material exposures to foreign currency rate fluctuations from operations. However, as our business in markets outside of the U.S. continues to increase, we will be exposed to foreign currency exchange risk related to our foreign operations.
The change in other income, net, compared to the same in 2022, was primarily due to an employee retention credit received during the year ended December 31, 2023.
The increase in other (expense) income, net, was primarily due to foreign currency rates and recognition of an employee retention credit during the year ended December 31, 2023.
Results of Operations Total revenue Year Ended December 31, Change (in thousands, except %) 2023 2022 $ % Revenue: Revenue from products and services $ 482,262 $ 350,852 $ 131,410 37 % Revenue from international supply agreement — 15 (15 ) (100 )% Total revenue $ 482,262 $ 350,867 $ 131,395 37 % Revenue from products and services increased by $131.4 million, or 37%, during the year ended December 31, 2023, compared to the year ended December 31, 2022.
Results of Operations Total revenue Year Ended December 31, Change (in thousands, except %) 2024 2023 $ % Revenue from products and services $ 611,562 $ 482,262 $ 129,300 27 % Revenue from products and services increased by $129.3 million, or 27%, during the year ended December 31, 2024, compared to the year ended December 31, 2023.
During the year ended December 31, 2023, the vesting conditions of certain of these amended awards were deemed probable, resulting in an increase in stock-based compensation for the year.
Stock-based compensation associated with these awards was higher during the year ended December 31, 2023 as the vesting conditions of certain of these amended awards that met the requirements for presentation within cost of sales were deemed probable at that time.
As of December 31, 2023, the remaining minimum purchase commitment under the agreement was $13.9 million. 43 Table of Contents Contractual obligations and commercial commitments Total contractual obligations and commercial commitments as of December 31, 2023 are summarized in the following table (in thousands): Payments Due by Period Total 1 Year or Less More than 1 Year 2026 Notes $ 316,250 $ — $ 316,250 Braidwell Term Loan, including final payment fee of $4,875 154,875 — 154,875 Interest expense (1) 76,577 19,760 56,817 Revolving Credit Facility 49,720 — 49,720 Facility lease obligations (2) 34,209 5,505 28,704 Purchase commitments (3) 13,887 4,529 9,358 Other (4) 4,811 1,584 3,227 Development services plans 1,248 — 1,248 Total $ 651,577 $ 31,378 $ 620,199 (1) Represents interest expense from our debt that we expect to pay in the future.
As of December 31, 2024, the remaining minimum purchase commitment under the agreement was $8.8 million. 41 Table of Contents Contractual obligations and commercial commitments Total contractual obligations and commercial commitments as of December 31, 2024 are summarized in the following table (in thousands): Payments Due by Period Total 1 Year or Less More than 1 Year 2026 Notes $ 316,250 $ — $ 316,250 Braidwell Term Loan, including final payment fee of $6,500 206,500 — 206,500 Interest expense (1) 65,759 22,807 42,952 Revolving Credit Facility 63,284 — 63,284 Facility lease obligations 42,329 7,112 35,217 Purchase commitments (2) 8,810 4,405 4,405 Other (3) 3,052 1,226 1,826 Development services plans 1,532 — 1,532 Total $ 707,516 $ 35,550 $ 671,966 (1) Represents interest expense from our debt that we expect to pay in the future.
Research and development expenses increased by $26.1 million, or 59%, during the year ended December 31, 2023, compared to the year ended December 31, 2022. The increase was primarily due to an increase in personnel to support the expansion of our new product portfolio and an increase in stock-based compensation associated with Development Service Agreements described above.
The increase was primarily due to an increase in personnel to support the expansion of our new product portfolio and an increase in stock-based compensation associated with Development Service Agreements (as described above), as the vesting conditions of certain of these amended awards, that met the requirements for presentation within research and development, were deemed probable during the year.
Generally, we do not have observable evidence of the standalone selling price related to our future service obligations; therefore, we estimate the selling price using an expected cost plus a margin approach. The transaction price is allocated using the relative standalone selling price method.
Generally, we estimate the selling price of promised services included in the equipment sales price using an expected cost plus a margin approach and/or the separately observable price of such service, if available. The transaction price for a contract’s various performance obligations is allocated using the relative standalone selling price method.
The increase of amortization of acquired intangible assets is primarily due to the amortization of intangible assets acquired in the Valence acquisition. Transaction-related expenses. The increase in transaction-related expenses for the year ended December 31, 2023 is primarily due to the closing of the Valence acquisition. Restructuring expenses .
Amortization expense increased $2.0 million, or 14%, during the year ended December 31, 2024, compared to the year ended December 31, 2023. The increase in amortization expense is primarily due to amortization of intangible assets acquired in the acquisition of Valence in April 2023 and internally-developed software placed in service during 2024. 38 Table of Contents Transaction-related expenses.
Financing Activities Financing activities provided net cash of $356.9 million for the year ended December 31, 2023, which is primarily related to net proceeds from the Braidwell Term Loan, the Revolving Credit Facility, and the equity offerings described above, offset by payment of outstanding OCEANEs, defined below.
Financing Activities Financing activities provided net cash of $56.2 million for the year ended December 31, 2024, which is primarily related to proceeds from our term loan and net draws on our revolving line of credit. Debt and Commitments As of December 31, 2024, we had $200.0 million outstanding under the Braidwell Term Loan.
The increase was primarily due to an increase in product volume that was due to the increase in our surgeon user base, continued expansion of our product portfolio, and increasing adoption of our technology.
The increase was primarily due to an increase in product volume that was due to the increase in our surgeon user base, continued expansion of our product portfolio, and increasing adoption of our technology. 37 Table of Contents Cost of sales Year Ended December 31, Change (in thousands, except %) 2024 2023 $ % Cost of sales $ 187,300 $ 172,059 $ 15,241 9 % Cost of sales increased by $15.2 million, or 9%, during the year ended December 31, 2024, compared to the year ended December 31, 2023.
(2) Includes our headquarters building lease that commenced in February 2021. (3) Includes inventory purchase commitments of $13.9 million. (4) Represents cash repayments of government sponsored COVID relief initiatives at EOS. Off-Balance Sheet Arrangements As of December 31, 2023, we did not have any off-balance sheet arrangements.
(2) Includes inventory purchase commitments of $8.8 million. (3) Represents other debt. Off-Balance Sheet Arrangements As of December 31, 2024, we did not have any off-balance sheet arrangements.
Income tax provision Year Ended December 31, Change (in thousands, except %) 2023 2022 $ % Income tax provision $ (277 ) $ (716 ) $ 439 (61 )% Income tax provision for the year ended December 31, 2023 was negligible and remained consistent compared to the year ended December 31, 2022. 41 Table of Contents Liquidity and Capital Resources Our principal sources of liquidity are our existing cash and cash equivalents, our Revolving Credit Facility, and cash from operations.
Income tax provision Year Ended December 31, Change (in thousands, except %) 2024 2023 $ % Income tax provision (benefit) $ 50 $ (277 ) $ 327 (118 )% Income tax provision for the year ended December 31, 2024 was negligible and remained consistent compared to the year ended December 31, 2023.
We are and may become involved in various legal proceedings arising from our business activities.
We do not have any material financial exposure to one customer or one country, outside the U.S., that would significantly hinder our liquidity. We are and may become involved in various legal proceedings arising from our business activities.
Operating expenses Year Ended December 31, Change (in thousands, except %) 2023 2022 $ % Operating expenses: Research and development $ 70,115 $ 44,033 $ 26,082 59 % Sales, general and administrative 374,080 300,013 74,067 25 % Litigation-related expenses 22,287 23,943 (1,656 ) (7 )% Amortization of acquired intangible assets 14,284 10,115 4,169 41 % Transaction-related expenses 2,113 120 1,993 1,661 % Restructuring expenses 719 1,810 (1,091 ) (60 )% Total operating expenses $ 483,598 $ 380,034 $ 103,564 27 % 40 Table of Contents Research and development expenses .
Operating expenses Year Ended December 31, Change (in thousands, except %) 2024 2023 $ % Operating expenses: Research and development $ 80,718 $ 70,115 $ 10,603 15 % Sales, general and administrative 450,199 374,080 76,119 20 % Litigation-related expenses 9,799 22,287 (12,488 ) (56 )% Amortization expense 16,258 14,284 1,974 14 % Transaction-related expenses 210 2,113 (1,903 ) (90 )% Restructuring expenses 3,247 719 2,528 352 % Total operating expenses $ 560,431 $ 483,598 $ 76,833 16 % Research and development expenses .
Total interest and other expense, net Year Ended December 31, Change (in thousands, except %) 2023 2022 $ % Interest and other income, net: Interest expense, net $ (16,641 ) $ (5,505 ) $ (11,136 ) 202 % Other income, net 3,121 471 2,650 563 % Total interest and other income, net $ (13,520 ) $ (5,034 ) $ (8,486 ) 169 % The increase in interest expense, net, during the year ended December 31, 2023, compared to the year ended December 30, 2022, was primarily due to interest on our revolving credit facility and Braidwell Term Loan which were executed in September 2022 and January 2023, respectively.
Total interest and other expense, net Year Ended December 31, Change (in thousands, except %) 2024 2023 $ % Other expense, net: Interest expense, net $ (24,879 ) $ (16,641 ) $ (8,238 ) 50 % Other (expense) income, net (1,025 ) 3,121 (4,146 ) (133 )% Total other expense, net $ (25,904 ) $ (13,520 ) $ (12,384 ) 92 % Interest expense, net, increased $8.2 million, or 50%, during the year ended December 31, 2024, compared to the year ended December 31, 2023.
The decrease in restructuring costs for the year ended December 31, 2023 is due to cost rationalization efforts that were completed during the year ended December 31, 2022.
Transaction-related expenses decreased $1.9 million, or 90%, during the year ended December 31, 2024, compared to the year ended December 31, 2023. The decrease in transaction-related expenses is due to the Valence acquisition in April 2023. Restructuring expenses .
Cost of sales Year Ended December 31, Change (in thousands, except %) 2023 2022 $ % Cost of sales $ 172,059 $ 117,808 $ 54,251 46 % Cost of sales increased by $54.3 million, or 46%, during the year ended December 31, 2023, compared to the year ended December 31, 2022.
Research and development expenses increased by $10.6 million, or 15%, during the year ended December 31, 2024, compared to the year ended December 31, 2023.