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Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Components Of Deferred Tax Assets And Liabilities [Abstract] |  |
Federal and state net operating loss carryforwards | $ 91,267 | $ 91,683
Tax credit carryforwards | 52,243 | 45,885
Foreign net operating loss carryforwards | 37,786 | 21,295
Stock-based compensation | 11,159 | 9,281
Lease obligations | 10,698 | 2,511
Reserves and accruals | 5,353 | 6,072
Deferred revenue | 13,323 | 16,454
Fixed assets | 0 | 356
Other | 284 | 450
Subtotal | 222,113 | 193,987
Less: Valuation allowance | (213,847) | (193,987)
Net deferred tax assets | 8,266 | 0
Fixed assets | (8,266) | 0
Other | 0 | 0
Net deferred tax liabilities | (8,266) | 0
Total net deferred tax assets | $ 0 | $ 0

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