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Income Taxes - Schedule of Company's Deferred Tax Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 93,824 | $ 90,921
Research and development tax credit carryforwards | 9,979 | 8,646
Stock-based compensation | 6,853 | 8,171
Deferred revenue | 4,479 | 2,690
Other | 2,807 | 2,471
Total deferred tax asset | 117,942 | 112,899
Valuation allowance | $ (117,942) | (112,899)
Liabilities: |  |
Net deferred tax liability related to intangible assets |  | (748)
Total deferred tax liability |  | $ (748)

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