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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss carryforwards $ 231,918 $ 186,342
General business credits 109,502 66,371
Product license 6,902 7,730
Inventory 7,651 0
Other 24,855 17,217
Gross deferred tax assets 380,828 277,660
Deferred tax liabilities:    
Intangibles (15,424) (16,360)
Convertible debt (32,799) 0
Deferred tax liabilities (48,223) (16,360)
Net deferred tax assets 332,605 261,300
Valuation allowance (332,605) (261,300)
Net deferred tax assets $ 0 $ 0