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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] |  |
Net operating loss carryforwards | $ 4,464 | $ 1,028
Tax credit carryforwards | 134 | 345
Stock-based compensation | 2,223 | 2,550
Licensing deduction deferral | 5,961 | 2,105
Other | 56 | 395
Gross deferred tax assets | 12,838 | 6,423
Valuation allowance | (11,410) | (4,658)
Net deferred tax asset | $ 1,428 | $ 1,765

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