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Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Accrued expense $ 8,208 $ 5,528
Amortization 87,998 80,677
Federal tax credits 142,595 123,405
State tax credits 8,054  
Federal net operating losses 76,589 16,999
State net operating losses 9,159 1,428
Foreign net operating losses 3,316  
Capitalized research and development costs 241 661
Share based compensation and other 15,273 14,612
Liability for sale of future royalties 148,503 161,204
Noncash interest expense 26,040  
Other comprehensive loss 143 7,624
Total gross deferred tax assets 526,119 412,138
Less valuation allowance (525,570) (379,608)
Total deferred tax assets, net of valuation allowance 549 32,530
Deferred tax liabilities:    
Depreciation (549) (2,904)
Convertible debt   (29,626)
Indefinite lived intangible (137,110) (136,735)
Total gross deferred tax liabilities (137,659) (169,265)
Net deferred tax assets (liabilities) $ (137,110) $ (136,735)