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Income Taxes - Significant Components of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Deferred tax assets: |  |  |
Equity compensation | $ 84 |  |
Accrued liabilities |  | $ 519 |
Research tax credits | 135 | 161 |
Lease obligation | 206 |  |
Other | 72 | 60 |
Net operating losses | 14,502 | 10,624 |
Total deferred tax assets | 14,999 | 11,364 |
Deferred tax liabilities: |  |  |
Right of use asset | 206 |  |
Total deferred tax liabilities | 206 | 0 |
Valuation allowance | 14,793 | 11,364 | $ 5,972
Net deferred tax assets | $ 0 | $ 0 |

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