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Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Accrued expense $ 8,744 $ 25,400
Amortization 102,308 137,808
Federal tax credits 146,515 205,485
State tax credits 9,822 9,817
Federal net operating losses   60,270
State net operating losses 13,319 18,680
Foreign net operating losses 3,265 4,052
Capitalized research and development costs 157,234 149,683
Share based compensation and other 24,219 30,757
Liability for sale of future royalties 394,132 190,659
Noncash interest expense 10,413 9,410
Other comprehensive loss (647) (728)
Total gross deferred tax assets 869,324 841,293
Less valuation allowance (857,584) (833,810)
Total deferred tax assets, net of valuation allowance 11,740 7,483
Deferred tax liabilities:    
Depreciation (11,740) (7,483)
Indefinite lived intangible   (55,905)
Total gross deferred tax liabilities $ (11,740) (63,388)
Net deferred tax assets (liabilities)   $ (55,905)