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Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Components Of Deferred Tax Assets And Liabilities [Abstract] |  |
Federal and state net operating loss carryforwards | $ 42,900 | $ 53,393
Tax credit carryforwards | 29,846 | 26,620
Foreign net operating loss carryforwards | 11,704 | 8,421
Stock-based compensation | 11,231 | 8,512
Lease obligations | 4,414 | 4,335
Reserves and accruals | 5,465 | 4,891
Deferred revenue | 22,909 | 10,484
Other | 741 | 915
Subtotal | 129,210 | 117,571
Less: Valuation allowance | (128,995) | (116,718)
Net deferred tax assets | 215 | 853
Fixed assets | (122) | (853)
Other | (93) | 0
Net deferred tax liabilities | (215) | (853)
Total net deferred tax assets | $ 0 | $ 0

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