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Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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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

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