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Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Components Of Deferred Tax Assets And Liabilities [Abstract] |  |
Federal and state net operating loss carryforwards | $ 71,256 | $ 42,900
Tax credit carryforwards | 39,488 | 29,846
Foreign net operating loss carryforwards | 15,052 | 11,704
Stock-based compensation | 7,835 | 11,231
Lease obligations | 2,737 | 4,414
Reserves and accruals | 4,851 | 5,465
Deferred revenue | 18,103 | 22,909
Other | 420 | 741
Subtotal | 159,742 | 129,210
Less: Valuation allowance | (159,540) | (128,995)
Net deferred tax assets | 202 | 215
Fixed assets | (181) | (122)
Other | (21) | (93)
Net deferred tax liabilities | (202) | (215)
Total net deferred tax assets | $ 0 | $ 0

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