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Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Accrued expense $ 25,400 $ 2,124
Amortization 137,808 52,532
Federal tax credits 205,485 174,802
State tax credits 9,817 9,787
Federal net operating losses 60,270 69,957
State net operating losses 18,680 10,316
Foreign net operating losses 4,052 4,837
Capitalized research and development costs 149,683 110,219
Share based compensation and other 30,757 27,054
Liability for sale of future royalties 190,659 185,589
Noncash interest expense 9,410 30,160
Other comprehensive loss (728) (719)
Total gross deferred tax assets 841,293 676,658
Less valuation allowance (833,810) (672,172)
Total deferred tax assets, net of valuation allowance 7,483 4,486
Deferred tax liabilities:    
Depreciation (7,483) (4,486)
Indefinite lived intangible (55,905) (102,834)
Total gross deferred tax liabilities (63,388) (107,320)
Net deferred tax assets (liabilities) $ (55,905) $ (102,834)