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Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Components Of Deferred Tax Assets And Liabilities [Abstract] |  |
Federal and state net operating loss carryforwards | $ 91,683 | $ 71,256
Tax credit carryforwards | 45,885 | 39,488
Foreign net operating loss carryforwards | 21,295 | 15,052
Stock-based compensation | 9,281 | 7,835
Lease obligations | 2,511 | 2,737
Reserves and accruals | 6,072 | 4,851
Deferred revenue | 16,454 | 18,103
Fixed assets | 356 | 0
Other | 450 | 420
Subtotal | 193,987 | 159,742
Less: Valuation allowance | (193,987) | (159,540)
Net deferred tax assets | 0 | 202
Fixed assets | 0 | (181)
Other | 0 | (21)
Net deferred tax liabilities | 0 | (202)
Total net deferred tax assets | $ 0 | $ 0

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