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Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Components Of Deferred Tax Assets And Liabilities [Abstract]    
Federal and state net operating loss carryforwards $ 134,033 $ 91,267
Tax credit carryforwards 62,465 52,243
Foreign net operating loss carryforwards 32,417 37,786
Stock-based compensation 10,399 11,159
Lease obligations 8,243 10,698
Reserves and accruals 5,875 5,353
Deferred revenue 13,550 13,323
Intangible assets 75,915 0
Other 0 284
Subtotal 342,897 222,113
Less: Valuation allowance (337,824) (213,847)
Net deferred tax assets 5,073 8,266
Fixed assets (5,073) (8,266)
Other 0 0
Net deferred tax liabilities (5,073) (8,266)
Total net deferred tax assets $ 0 $ 0