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Income Taxes - Schedule of Significant Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Components Of Deferred Tax Assets And Liabilities [Abstract] |  |
Federal and state net operating loss carryforwards | $ 53,393 | $ 44,748
Tax credit carryforwards | 26,620 | 24,395
Foreign net operating loss carryforwards | 8,421 | 6,485
Stock-based compensation | 8,512 | 5,836
Lease obligations | 4,335 | 5,204
Reserves and accruals | 4,891 | 5,075
Deferred revenue | 10,484 | 3,304
Other | 915 | 950
Subtotal | 117,571 | 95,997
Less: Valuation allowance | (116,718) | (94,731)
Net deferred tax assets | 853 | 1,266
Fixed assets | (853) | (1,266)
Net deferred tax liabilities | (853) | (1,266)
Total net deferred tax assets | $ 0 | $ 0

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