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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Accrued expenses | $ 107 | $ 132
Stock-based compensation | 2,436 | 1,911
Lease liability | 945 | 0
Other | (856) | (31)
Net operating loss carryforwards | 58,073 | 44,730
Research and development credits | 5,984 | 3,226
Total deferred tax assets | 66,689 | 49,968
Valuation allowances | (66,689) | (49,968)
Net deferred tax assets | $ 0 | $ 0

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