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Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Deferred Income Taxes and Other Assets, Noncurrent $ 0 $ 736
Deferred tax assets:    
Accrued expense 2,588 714
Amortization 78,291 5,148
Depreciation 991 1,601
Federal tax credits 99,421 89,070
State tax credits 6,489 5,473
Federal net operating losses 91,010 62,159
State net operating losses 1,360 165
Foreign net operating losses 1,056 736
Capitalized research and development costs 1,274 2,093
Share based compensation and other 16,425 21,411
Other comprehensive loss 1,512 0
Total gross deferred tax assets 300,417 188,570
Less valuation allowance (267,131) (180,481)
Total deferred tax assets, net of valuation allowance 33,286 8,089
Deferred tax liabilities:    
Convertible debt (33,286) (7,353)
Indefinite lived intangible (130,862) (122,032)
Total gross deferred tax liabilities (164,148) (129,385)
Net deferred tax assets (liabilities) $ (130,862) $ (121,296)