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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating losses | $ 34,938 | $ 13,054
Capitalized license | 771 | 835
Research credits | 4,151 | 1,007
Accruals | 401 | 514
Stock-based compensation | 53 | 51
Net unrealized loss |  | 11
Total gross deferred tax assets | 40,314 | 15,472
Less valuation allowance | (40,221) | (15,395)
Total deferred tax assets | 93 | 77
Deferred tax liabilities: |  |
Net unrealized gain | 13 |
Depreciation and amortization | 80 | 77
Total gross deferred tax liability | 93 | 77
Net deferred tax assets | $ 0 | $ 0

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