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Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Components Of Deferred Tax Assets [Abstract] |  |
Capitalized research and development expenses | $ 21,979 | $ 26,367
Net operating loss carryforwards | 12,901 | 4,701
Research and development and other tax credit carryforwards | 12,343 | 12,225
Stock compensation | 4,732 | 3,680
Deferred revenue | 4,100 | 3,928
Other | 1,483 | 883
Total deferred tax assets | 57,538 | 51,784
Valuation allowance | $ (57,538) | $ (51,784)

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