Biggest changeThis benefit increased net income by $2.58 per basic and $2.56 per diluted share for the year ended December 31, 2021. 71 Table of Contents Revenues For the Year Ended, December 31, 2022 2021 (in millions) JAKAFI revenues, net $ 2,409.2 $ 2,134.5 ICLUSIG revenues, net 105.8 109.4 PEMAZYRE revenues, net 83.5 68.5 MINJUVI revenues, net 19.7 4.9 OPZELURA revenues, net 128.7 4.7 Total product revenues, net 2,746.9 2,322.0 JAKAVI product royalty revenues 331.6 338.0 OLUMIANT product royalty revenues 134.5 220.9 TABRECTA product royalty revenues 15.4 10.4 PEMAZYRE product royalty revenues 1.2 — Total product royalty revenues 482.7 569.3 Milestone and contract revenues 165.0 95.0 Total revenues $ 3,394.6 $ 2,986.3 The increase in JAKAFI product revenues from 2021 to 2022 was comprised of a volume increase of $156.5 million and a price increase of $118.2 million.
Biggest changeRevenues For the Year Ended, December 31, 2023 2022 (in millions) JAKAFI revenues, net $ 2,593.7 $ 2,409.2 OPZELURA revenues, net 337.9 128.7 ICLUSIG revenues, net 111.6 105.8 PEMAZYRE revenues, net 83.6 83.5 MINJUVI revenues, net 37.1 19.7 ZYNYZ revenues, net 1.3 — Total product revenues, net 3,165.2 2,746.9 JAKAVI product royalty revenues 367.6 331.6 OLUMIANT product royalty revenues 136.1 134.5 TABRECTA product royalty revenues 17.8 15.4 PEMAZYRE product royalty revenues 1.9 1.2 Total product royalty revenues 523.4 482.7 Milestone and contract revenues 7.0 165.0 Total revenues $ 3,695.6 $ 3,394.6 The increase in JAKAFI product revenues from 2022 to 2023 was comprised of a volume increase of $135.3 million and a price increase of $49.2 million.
We also assess collectability based primarily on the customer’s payment history and on the creditworthiness of the customer. Product Revenues Our product revenues consist of sales of JAKAFI, OPZELURA, PEMAZYRE, ICLUSIG, and MINJUVI. Product revenues are recognized once we satisfy the performance obligation at a point in time under the revenue recognition criteria as described above.
We also assess collectability based primarily on the customer’s payment history and on the creditworthiness of the customer. Product Revenues Our product revenues consist of sales of JAKAFI, OPZELURA, ICLUSIG, PEMAZYRE, MINJUVI, and ZYNYZ. Product revenues are recognized once we satisfy the performance obligation at a point in time under the revenue recognition criteria as described above.
During 2022, net cash used in investing activities was $78.5 million, which represents purchases of marketable securities of $79.9 million, capital expenditures of $77.8 million, offset in part by the sale and maturity of marketable securities of $79.2 million.
During 2022, net cash used in investing activities was $78.5 million, which represents purchases of marketable securities of $79.9 million, capital expenditures of $77.8 million, offset in part by the sale and maturity of marketable securities of $79.2 million. Cash used in financing activities.
Salary and benefits related expense increased from 2021 to 2022 due primarily to increased development headcount to sustain our development pipeline. Stock compensation expense may fluctuate from period to period based on the number of awards granted, stock price volatility and expected award lives, as well as expected award forfeiture rates which are used to value equity-based compensation.
Salary and benefits related expense increased from 2022 to 2023 due primarily to increased development headcount to sustain our development pipeline. Stock compensation expense may fluctuate from period to period based on the number of awards granted, stock price volatility and expected award lives, as well as expected award forfeiture rates which are used to value equity-based compensation.
A discussion of our financial performance for the year ended December 31, 2022 as compared to the year ended December 31, 2021 appears below under the captions “Results of Operations” and “Liquidity and Capital Resources.” A discussion of our financial performance for the year ended December 31, 2021 compared to the year ended December 31, 2020 can be found under the same captions in Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2021, filed with the SEC on February 8, 2022, which is available free of charge on the SEC’s website at www.sec.gov and our Investor Relations website at investor.incyte.com/financial-information/annual-reports .
A discussion of our financial performance for the year ended December 31, 2023 as compared to the year ended December 31, 2022 appears below under the captions “Results of Operations” and “Liquidity and Capital Resources.” A discussion of our financial performance for the year ended December 31, 2022 compared to the year ended December 31, 2021 can be found under the same captions in Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on February 7, 2023, which is available free of charge on the SEC’s website at www.sec.gov and our Investor Relations website at investor.incyte.com/financial-information/annual-reports .
These website addresses are intended to be inactive, textual references only. None of the materials on, or accessible through, these websites are part of this report or are incorporated by reference herein. Overview Incyte is a biopharmaceutical company focused on the discovery, development and commercialization of proprietary therapeutics.
These website addresses are intended to be inactive, textual references only. None of the materials on, or accessible through, these websites are part of this report or are incorporated by reference herein. Overview Incyte is a global biopharmaceutical company engaged in the discovery, development and commercialization of proprietary therapeutics.
As a result of releasing the valuation allowance on the majority of our U.S. deferred tax assets in 2021, we expect that our reported income tax expense (current plus deferred) for future periods will be higher than that recorded for prior periods. Acquisition-related contingent consideration.
As a result of releasing the valuation allowance on the majority of our U.S. deferred tax assets in 2021, we expect that our reported income tax expense (current plus deferred) for future periods will be higher than that recorded for prior periods.
(Profit) and loss sharing under collaboration agreements Under the collaboration and license agreement with MorphoSys, which was executed in March 2020, we and MorphoSys are both responsible for the commercialization efforts of tafasitamab in the United States and will share equally the profits and losses from the co-commercialization efforts.
(Profit) and loss sharing under collaboration agreements Under the now terminated collaboration and license agreement with MorphoSys, which was executed in March 2020, we and MorphoSys were both responsible for the commercialization efforts of tafasitamab in the United States and will share equally the profits and losses from the co-commercialization efforts.
For the years ending December 31, 2022 and 2021, our Black-Scholes assumptions included a weighted-average stock price volatility of 36% in 2022 and 39% in 2021, average expected option life of approximately five years and an estimated annualized forfeiture rate of 5%.
For the years ending December 31, 2023 and 2022, our Black-Scholes assumptions included a weighted-average stock price volatility of 32% in 2023 and 36% in 2022, average expected option life of approximately five years and an estimated annualized forfeiture rate of 5%.
The average risk-free interest rate assumption used in the Black-Scholes valuations increased from 0.62% in 2021 to 2.14% in 2022. The fair value of stock options, which are subject to graded vesting, are recognized as compensation expense over the requisite service period using the accelerated attribution method.
The average risk-free interest rate assumption used in the Black-Scholes valuations increased from 2.14% in 2022 to 4.01% in 2023. The fair value of stock options, which are subject to graded vesting, are recognized as compensation expense over the requisite service period using the accelerated attribution method.
Our product revenues may fluctuate from period to period due to our customers’ purchasing patterns over the course of a year, including as a result of increased inventory building by customers in advance of expected or announced price increases.
Our product revenues may fluctuate from period to period due to our customers’ purchasing patterns over the course of a year, including as a result of increased inventory building by customers in advance of expected or announced price increases. Product revenues are recorded net of sales allowances.
Cash (used in) provided by financing activities. During 2022, net cash used in financing activities was $0.8 million, and in 2021, net cash provided by financing activities was $6.2 million, respectively, consisting primarily of proceeds from the issuance of common stock under our stock plans net of tax withholdings, offset in part by cash paid to ARIAD/Takeda for contingent consideration.
During 2023, net cash used in financing activities was $20.0 million, and in 2022, net cash used in financing activities was $0.8 million, respectively, consisting primarily of cash paid to ARIAD/Takeda for contingent consideration, offset in part by proceeds from the issuance of common stock under our stock plans net of tax withholdings.
Product royalty revenues on commercial sales of PEMAZYRE by Innovent are based on net sales of licensed products in licensed territories as provided by Innovent. Our milestone and contract revenues were $165.0 million and $95.0 million for the years ended December 31, 2022 and 2021, respectively.
Product royalty revenues on commercial sales of PEMAZYRE by Innovent are based on net sales of licensed products in licensed territories as provided by Innovent. 72 Table of Contents Our milestone and contract revenues were $7.0 million and $165.0 million for the years ended December 31, 2023 and 2022, respectively.
The increase in cash provided by operating activities from 2021 to 2022 was due primarily to changes in working capital. Cash used in investing activities. Our investing activities, other than purchases, sales and maturities of marketable securities, have consisted predominantly of capital expenditures and purchases of long term investments.
Cash provided by operating activities. The decrease in cash provided by operating activities from 2022 to 2023 was due primarily to changes in working capital. 75 Table of Contents Cash used in investing activities. Our investing activities, other than purchases, sales and maturities of marketable securities, have consisted predominantly of capital expenditures and purchases of long term investments.
Product royalty revenues on commercial sales of OLUMIANT by Lilly are based on net sales of licensed products in licensed territories as provided by Lilly.
Product royalty revenues on commercial sales of JAKAVI and TABRECTA by Novartis are based on net sales of licensed products in licensed territories as provided by Novartis. Product royalty revenues on commercial sales of OLUMIANT by Lilly are based on net sales of licensed products in licensed territories as provided by Lilly.
As of December 31, 2022, a 5% change in our sales allowance and accruals would have had an approximate $50.1 million impact on our income before taxes. Customer Credits: Our customers are offered various forms of consideration, including allowances, service fees and prompt payment discounts.
As of December 31, 2023, a 5% change in our sales allowance and accruals would have had an approximate $64.3 million impact on our income before taxes. 68 Table of Contents Customer Credits: Our customers are offered various forms of consideration, including allowances, service fees and prompt payment discounts.
Estimates are assessed as of the end of each reporting period and are updated to reflect current information. We believe that our sales allowances and accruals are reasonable and appropriate based on current facts and circumstances.
These sales allowances and accruals are recorded based on estimates which are described in detail below. Estimates are assessed as of the end of each reporting period and are updated to reflect current information. We believe that our sales allowances and accruals are reasonable and appropriate based on current facts and circumstances.
For the year ended December 31, 2022 and 2021, our 50% share of the costs for tafasitamab was $8.0 million and $37.0 million, respectively, as recorded in (profit) and loss sharing under collaboration agreements on the consolidated statement of operations. Other income (expense), net Other income (expense), net.
For the year ended December 31, 2023 and 2022, our 50% share of the costs for tafasitamab was $2.0 million and $8.0 million, respectively, as recorded in (profit) and loss sharing under collaboration agreements on the consolidated statement of operations.
The fair value of the acquisition-related contingent consideration is remeasured quarterly. The change in fair value of the acquisition-related contingent consideration for the years ended December 31, 2022 and 2021 was expense of $12.1 million and $14.7 million, respectively, which is recorded in loss on change in fair value of acquisition-related contingent consideration on the consolidated statements of operations.
The change in fair value of the acquisition-related contingent consideration for the years ended December 31, 2023 and 2022 was expense of $29.2 million and $12.1 million, respectively, which is recorded in loss on change in fair value of acquisition-related contingent consideration on the consolidated statements of operations.
The following table provides a summary of those unrealized gains and (losses): For the Years Ended, December 31, 2022 2021 (in millions) Agenus $ (9.9) $ 4.6 Calithera (0.9) (7.3) Merus (58.0) 48.1 MorphoSys (21.2) (68.7) Syndax 5.1 6.3 Syros (2.7) (7.1) Total unrealized loss on long term investments $ (87.6) $ (24.1) Provision (benefit) for income taxes.
The following table provides a summary of those unrealized gains and (losses): For the Years Ended, December 31, 2023 2022 (in millions) Agenus $ (18.9) $ (9.9) Calithera (0.2) (0.9) Merus 45.2 (58.0) MorphoSys 22.9 (21.2) Syndax (5.5) 5.1 Syros 0.4 (2.7) Total unrealized gain (loss) on long term investments $ 43.9 $ (87.6) Provision for income taxes.
Our portfolio focuses on areas of high unmet medical need and includes compounds in various stages, ranging from preclinical to late stage development, and commercialized products JAKAFI® (ruxolitinib), ICLUSIG® (ponatinib), PEMAZYRE® (pemigatinib) and OPZELURA™ (ruxolitinib) cream, as well as MINJUVI® (tafasitamab) and MONJUVI® (tafasitamab-cxix), which are co-commercialized.
Our portfolio focuses on areas of high unmet medical need and includes compounds in various stages, ranging from preclinical to late stage development, and commercialized products JAKAFI (ruxolitinib), ICLUSIG (ponatinib), PEMAZYRE (pemigatinib) and OPZELURA (ruxolitinib) cream, as well as MINJUVI (tafasitamab) and MONJUVI (tafasitamab-cxix), which prior to our February 2024 acquisition of global rights to tafasitamab, were co-commercialized, and ZYNYZ (retifanlimab-dlwr).
We expect our customers will earn prompt payment discounts and, therefore, we deduct the full amount of these discounts from total product sales when revenues are recognized.
We expect our customers will earn prompt payment discounts and, therefore, we deduct the full amount of these discounts from total product sales when revenues are recognized. Service fees are also deducted from total product sales as they are earned.
Research and development expenses also include upfront and milestone expenses related to our collaborative agreements and the acquisition of Villaris, which were $126.0 million and $149.0 million for the years ended December 31, 2022 and 2021, respectively.
Research and development expenses include upfront and milestone expenses related to our collaborative agreements and the asset acquisition of Villaris in 2022, which were $36.7 million and $126.0 million for the years ended December 31, 2023 and 2022, respectively.
Our global headquarters is located in Wilmington, Delaware, where we conduct global clinical development and commercial operations. We also conduct clinical development and commercial operations from our European headquarters in Morges, Switzerland and our other offices across Europe, our Japanese office in Tokyo and our Canadian headquarters in Montreal.
We also conduct clinical development and commercial operations from our European headquarters in Morges, Switzerland and our other offices across Europe, as well as our Japanese office in Tokyo and our Canadian headquarters in Montreal.
Results of Operations Years Ended December 31, 2022 and 2021 We recorded net income for the years ended December 31, 2022 and 2021 of $340.7 million and $948.6 million, respectively. On a per share basis, basic net income was $1.53 and diluted net income was $1.52 for the year ended December 31, 2022.
Results of Operations Years Ended December 31, 2023 and 2022 We recorded net income for the years ended December 31, 2023 and 2022 of $597.6 million and $340.7 million, respectively. On a per share basis, basic net income was $2.67 and diluted net income was $2.65 for the year ended December 31, 2023.
We adjust our estimates for government rebates and chargebacks based on new information regarding actual rebates as it becomes available. Claims by third-party payors for rebates and chargebacks are frequently submitted after the period in which the related sales occurred, which may result in adjustments to prior period accrual balances in the period in which the new information becomes available.
Claims by third-party payors for rebates and chargebacks are frequently submitted after the period in which the related sales occurred, which may result in adjustments to prior period accrual balances in the period in which the new information becomes available.
Selling, general and administrative expenses For the Year Ended December 31, 2022 2021 (in millions) Salary and benefits related $ 269.1 $ 222.4 Stock compensation 73.2 67.0 Other contract services and outside costs 659.8 450.2 Total selling, general and administrative expenses $ 1,002.1 $ 739.6 Salary and benefits related expense increased from 2021 to 2022 due primarily to increased headcount.
Selling, general and administrative expenses For the Year Ended December 31, 2023 2022 (in millions) Salary and benefits related $ 300.1 $ 269.1 Stock compensation 86.1 73.2 Other contract services and outside costs 775.1 659.8 Total selling, general and administrative expenses $ 1,161.3 $ 1,002.1 Salary and benefits related expense increased from 2022 to 2023 due primarily to increased headcount.
We recognize revenues for product received by our customers net of allowances for customer credits, including estimated rebates, chargebacks, discounts, returns, distribution service fees, patient assistance programs, and government rebates, such as Medicare Part D coverage gap reimbursements in the United States. These sales allowances and accruals are recorded based on estimates which are described in detail below.
We recognize revenues for product received by our customers net of allowances for customer credits, including estimated rebates, chargebacks, discounts, returns, distribution service fees, patient assistance programs, and government rebates, such as the Medicaid Drug Rebate Program and Medicare Part D coverage gap reimbursements in the United States.
Cost of Product Revenues For the Year Ended December 31, 2022 2021 (in millions) Product costs $ 57.1 $ 21.0 Salary and benefits related 9.5 7.2 Stock compensation 2.7 1.7 Royalty expense 116.2 99.6 Amortization of definite-lived intangible assets 21.5 21.5 Total cost of product revenues $ 207.0 $ 151.0 Cost of product revenues includes all product related costs, employee personnel costs, including stock compensation, for those employees dedicated to the production of our commercial products, royalties owed under our collaborative agreements and amortization of our licensed intellectual property rights for ICLUSIG using the straight-line method over the estimated useful life of 12.5 years.
Cost of Product Revenues For the Year Ended December 31, 2023 2022 (in millions) Product costs $ 89.2 $ 57.1 Salary and benefits related 11.9 9.5 Stock compensation 3.1 2.7 Royalty expense 128.2 116.2 Amortization of definite-lived intangible assets 22.6 21.5 Total cost of product revenues $ 255.0 $ 207.0 Cost of product revenues includes all product related costs, reserves for obsolescence, employee personnel costs, including stock compensation, for those employees dedicated to the production of our commercial products, royalties owed under our collaborative agreements and amortization of our licensed intellectual property rights for ICLUSIG and the amortization of capitalized milestone payments.
Our cash and marketable securities balances are held in a variety of interest-bearing instruments, including money market accounts and U.S. government debt securities. Available cash is invested in accordance with our investment policy’s primary objectives of liquidity, safety of principal and diversity of investments. Cash provided by (used in) operating activities.
At December 31, 2023, we had available cash, cash equivalents and marketable securities of $3.7 billion. Our cash and marketable securities balances are held in a variety of interest-bearing instruments, including money market accounts and U.S. government debt securities. Available cash is invested in accordance with our investment policy’s primary objectives of liquidity, safety of principal and diversity of investments.
The increase in clinical research and outside services expense from 2021 to 2022 was primarily due to continued investment in our late stage development assets.
The decrease in clinical research and outside services expense from 2022 to 2023 was primarily due to a decrease in one-time collaboration related expenses. The increase in total research and development expense from 2022 to 2023 was primarily due to continued investment in our late stage development assets.
During 2022, we contracted with the three largest group purchasing organizations to obtain coverage for OPZELURA. All full buy-down programs for OPZELURA ended effective January 31, 2023. Our estimates for expected utilization of commercial insurance rebates are based on data received from our customers.
All full buy-down programs for OPZELURA ended effective January 31, 2023. Our estimates for expected utilization of commercial insurance rebates are based on data received from our customers.
In addition to one-time expenses resulting from upfront fees in connection with the entry into any new or amended collaboration agreements and payment of milestones under those agreements, research and development expenses may fluctuate from period to period depending upon the stage of certain projects and the level of pre-clinical and clinical trial related activities.
Research and development expenses for the years ended December 31, 2023 and 2022 were net of $49.1 million and $52.2 million, respectively, of costs reimbursed by our collaborative partners. 73 Table of Contents In addition to one-time expenses resulting from upfront fees in connection with the entry into any new or amended collaboration agreements and payment of milestones under those agreements, research and development expenses may fluctuate from period to period depending upon the stage of certain projects and the level of pre-clinical and clinical trial related activities.
During 2021, net cash used in investing activities was $207.7 million, which represents purchases of marketable securities of $235.2 million, capital expenditures of $181.0 million and purchase of long term equity investments of $33.5 million, offset in part by the sale and maturity of marketable securities of $231.5 million and the sale of long term investment of $10.5 million.
During 2023, net cash used in investing activities was $207.7 million, which represents purchases of marketable securities of $456.0 million, payments for intangible assets of $15.0 million, capital expenditures of $32.5 million, and purchases of long term investments of $10.0 million, offset in part by the sale and maturity of marketable securities of $305.8 million.
If actual future funding varies from estimates, we may need to adjust prior period accruals, which would affect revenue in the period of adjustment.
If actual future funding varies from estimates, we may need to adjust prior period accruals, which would affect revenue in the period of adjustment. Co-payment Assistance: Patients who have commercial insurance and meet certain eligibility requirements may receive co-payment assistance.
The decrease in OLUMIANT product royalty revenues for the year ended December 31, 2022 as compared to the corresponding period in 2021 reflects unfavorable changes in foreign currency exchange rates and a decrease in net product sales of OLUMIANT for use as a treatment for COVID-19.
The increase in OLUMIANT product royalty revenues for the year ended December 31, 2023 as compared to the corresponding period in 2022 includes unfavorable changes in foreign currency exchange rates.
Cost of product revenues increased from 2021 to 2022 due primarily to product related costs for our commercial products, including OPZELURA. 73 Table of Contents Operating Expenses Research and development expenses For the Year Ended December 31, 2022 2021 (in millions) Salary and benefits related $ 345.6 $ 306.0 Stock compensation 112.5 114.3 Clinical research and outside services 978.9 902.3 Occupancy and all other costs 148.9 135.6 Total research and development expenses $ 1,585.9 $ 1,458.2 We account for research and development costs by natural expense line and not costs by project.
Operating Expenses Research and development expenses For the Year Ended December 31, 2023 2022 (in millions) Salary and benefits related $ 399.1 $ 345.6 Stock compensation 126.7 112.5 Clinical research and outside services 936.7 978.9 Occupancy and all other costs 165.1 148.9 Total research and development expenses $ 1,627.6 $ 1,585.9 We account for research and development costs by natural expense line and not costs by project.
Acquisition-related contingent consideration, which consists of our future royalty obligations to ARIAD/Takeda, was recorded on the acquisition date at the estimated fair value of the obligation, in accordance with the acquisition method of accounting using an income approach based on projected future net revenues of ICLUSIG in the European Union and other countries.
Loss on change in fair value of acquisition-related contingent consideration Acquisition-related contingent consideration, which consists of our future royalty obligations to ARIAD/Takeda, was recorded on the acquisition date, June 1, 2016, at the estimated fair value of the obligation, in accordance with the acquisition method of accounting. The fair value of the acquisition-related contingent consideration is remeasured quarterly.
As of December 31, 2022, we had no outstanding borrowings and were in compliance with all covenants under this facility.
As of December 31, 2023, we had no outstanding borrowings and were in compliance with all covenants under this facility. The amendment to the credit facility is discussed further in Note 16 of Notes to the Consolidated Financial Statements.
The losses on change in fair value of the contingent consideration during the years ended December 31, 2022 and 2021, were due primarily to the impact of updated projections of future net revenues of ICLUSIG in the European Union and the passage of time.
The loss on change in fair value of the contingent consideration during the years ended December 31, 2023 and 2022 was due primarily to fluctuations in foreign currency exchange rates impacting future revenue projections of ICLUSIG and the passage of time.
We also establish business relationships with other companies and medical research institutions to acquire products or rights to products and technologies that are complementary to our business. Summarized below are the significant achievements under our existing collaboration and license agreements and additional agreements we entered into during the year ended December 31, 2022.
We also establish business relationships with other companies and medical research institutions to acquire products or rights to products and technologies that are complementary to our business.
Further information on the impacts of the valuation allowance and significant judgments related to changes can be found in Note 13 of Notes to the Consolidated Financial Statements. 75 Table of Contents Liquidity and Capital Resources 2022 2021 (in millions) December 31: Cash, cash equivalents, and marketable securities $ 3,239.0 $ 2,348.2 Working capital $ 2,935.8 $ 2,264.4 Year ended December 31: Cash provided by (used in): Operating activities $ 969.9 $ 749.5 Investing activities $ (78.5) $ (207.7) Financing activities $ (0.8) $ 6.2 Capital expenditures (included in investing activities above) $ (77.8) $ (181.0) Sources and Uses of Cash.
Liquidity and Capital Resources 2023 2022 (in millions) December 31: Cash, cash equivalents, and marketable securities $ 3,656.0 $ 3,239.0 Working capital $ 3,405.0 $ 2,935.8 Year ended December 31: Cash provided by (used in): Operating activities $ 496.5 $ 969.9 Investing activities $ (207.7) $ (78.5) Financing activities $ (20.0) $ (0.8) Capital expenditures (included in investing activities above) $ (32.5) $ (77.8) Sources and Uses of Cash.
These accruals are based on statutory discount rates and expected utilization as well as historical data we have accumulated since product launch. In the fourth quarter of 2021 and fiscal year 2022 for non-covered patients of OPZELURA, we offered a full buy-down program as we were in the process of obtaining commercial insurance coverage for OPZELURA.
In the fourth quarter of 2021 and fiscal year 2022 for non-covered patients of OPZELURA, we offered a full buy-down program as we were in the process of obtaining commercial insurance coverage for OPZELURA. During 2022, we contracted with the three largest group purchasing organizations to obtain coverage for OPZELURA.
Service fees are also deducted from total product sales as they are earned. 68 Table of Contents Rebates and Discounts: We accrue rebates for mandated discounts under the Medicaid Drug Rebate Program in the United States and mandated discounts in Europe in markets where government-sponsored healthcare systems are the primary payers for healthcare.
Rebates and Discounts: We accrue rebates for mandated discounts under the Medicaid Drug Rebate Program in the United States and mandated discounts in Europe in markets where government-sponsored healthcare systems are the primary payers for healthcare. These accruals are based on statutory discount rates and expected utilization as well as historical data we have accumulated since product launch.
Our capital expenditures for construction activities and our non-operating contractual operating and finance lease obligations are discussed in Note 8 of Notes to the Consolidated Financial Statements. In addition, in October 2019, we entered into an agreement with Wilmington Friends School Inc., to purchase property for $50.0 million to expand our global headquarters.
Our capital expenditures for construction activities and our non-operating contractual operating and finance lease obligations are discussed in Note 8 of Notes to the Consolidated Financial Statements. In August 2021, we entered into a $500.0 million, three-year senior unsecured revolving credit facility, which was subsequently amended in May 2023.
Our U.S. income tax payments will increase significantly due to the mandatory capitalization and amortization of research and development expenses for tax years beginning after December 31, 2021, as required under the Tax Cuts and Jobs Act of 2017, which eliminated the immediate expensing of such expenses. 76 Table of Contents We believe that our cash flow from operations, together with our cash, cash equivalents and marketable securities and funds available under our revolving credit facility, will be adequate to satisfy our capital needs for the foreseeable future.
We believe that our cash flow from operations, together with our cash, cash equivalents and marketable securities and funds available under our revolving credit facility, will be adequate to satisfy our capital needs for the foreseeable future.
Other income (expense), net, for the years ended December 31, 2022 and 2021 was $39.9 million and $10.6 million, respectively. The increase in other income (expense), net primarily relates to an increase in interest income. Unrealized gain (loss) on long term investments.
Interest income and other, net, for the years ended December 31, 2023 and 2022 was $172.3 million and $39.9 million, respectively.
The provision (benefit) for income taxes for the years ended December 31, 2022 and 2021 was a provision of $188.5 million and a benefit of $378.1 million, respectively. The increase in tax expense of $566.6 million from 2021 to 2022 was primarily driven by the change in valuation allowance for U.S. deferred tax assets.
The provision for income taxes for the years ended December 31, 2023 and 2022 was $236.6 million and $188.5 million, respectively.
The following table provides a summary of activity with respect to our sales allowances and accruals (in thousands): Year Ended December 31, 2022 Discounts and Distribution Fees Government Rebates and Chargebacks Co-Pay Assistance and Other Discounts Product Returns Total Balance at January 1, 2022 $ 14,678 $ 99,304 $ 24,074 $ 4,740 $ 142,796 Allowances for current period sales 119,977 621,051 258,041 5,587 1,004,656 Allowances for prior period sales (94) (2,626) (5) — (2,725) Credits/payments for current period sales (97,085) (509,430) (248,300) — (854,815) Credits/payments for prior period sales (12,160) (59,834) (8,230) (3,961) (84,185) Balance at December 31, 2022 $ 25,316 $ 148,465 $ 25,580 $ 6,366 $ 205,727 72 Table of Contents Government rebates and chargebacks are the most significant component of our sales allowances.
Our revenue recognition policies require estimates of the aforementioned sales allowances each period. 71 Table of Contents The following table provides a summary of activity with respect to our sales allowances and accruals (in thousands): Year Ended December 31, 2023 Discounts and Distribution Fees Government Rebates and Chargebacks Co-Pay Assistance and Other Discounts Product Returns Total Balance at January 1, 2023 $ 25,316 $ 148,465 $ 25,580 $ 6,366 $ 205,727 Allowances for current period sales 132,062 994,597 136,745 11,986 1,275,390 Allowances for prior period sales (729) 5,338 3,314 3,033 10,956 Credits/payments for current period sales (114,055) (811,357) (135,550) — (1,060,962) Credits/payments for prior period sales (22,115) (95,108) (17,073) (10,364) (144,660) Balance at December 31, 2023 $ 20,479 $ 241,935 $ 13,016 $ 11,021 $ 286,451 Government rebates and chargebacks are the most significant component of our sales allowances.
During the year ended December 31, 2021, our milestone and contract revenues were derived from the achievement of a $50.0 million sales milestone, a $10.0 million regulatory milestone, and $35.0 million upfront payment received upon our transfer of functional intellectual property to one of our collaboration partners.
During the year ended December 31, 2023, our milestone and contract revenues were primarily derived from a regulatory milestone under the Novartis collaboration and license agreement.
See Part I, Item 1A of this report, “Risk Factors” for a further discussion of certain factors that could impact our future product revenues. 65 Table of Contents Effects of the COVID-19 Pandemic on Our Business The impact of the COVID-19 pandemic on our operational and financial performance going forward depends on numerous factors, all of which are difficult to predict.
See Part I, Item 1A of this report, “Risk Factors” for a further discussion of certain factors that could impact our future product revenues. 67 Table of Contents Regulatory Achievements In March 2023, under our collaboration agreement with MacroGenics, we received FDA approval of ZYNYZ for the treatment of adults with Merkel cell carcinoma.
On a per share basis, basic net income was $4.30 and diluted net income was $4.27 for the year ended December 31, 2021. For the year ended December 31, 2021, we recorded a benefit from income taxes of $569.0 million when we released the valuation allowance on the majority of our U.S. deferred tax assets.
On a per share basis, basic net income was $1.53 and diluted net income was $1.52 for the year ended December 31, 2022.
The increase in other contract services and outside costs was primarily due to expenses related to our dermatology commercial organization and activities to support the launch of OPZELURA for the treatments of atopic dermatitis and vitiligo. 74 Table of Contents Loss on change in fair value of acquisition-related contingent consideration Acquisition-related contingent consideration, which consists of our future royalty obligations to ARIAD/Takeda, was recorded on the acquisition date, June 1, 2016, at the estimated fair value of the obligation, in accordance with the acquisition method of accounting.
The increase in other contract services and outside costs was primarily due to expenses related to promotional activities to support the launch of OPZELURA for the treatment of vitiligo.