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Income Taxes - Schedule of Company's Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 114,222 | $ 93,824
Research and development tax credit carryforwards | 12,518 | 9,979
Stock-based compensation | 8,565 | 6,853
Deferred revenue | 2,918 | 4,479
Other | 3,492 | 2,807
Total deferred tax asset | 141,715 | 117,942
Valuation allowance | $ 141,715 | $ 117,942

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