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Income Taxes - Significant Components of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Deferred tax assets: |  |  |
Employee compensation accruals |  | $ 292 |
Accrued liabilities | $ 519 | 353 |
Research tax credits | 161 | 17 |
Other | 60 | 34 |
Net operating losses | 10,624 | 5,289 |
Total deferred tax assets | 11,364 | 5,985 |
Deferred tax liabilities: |  |  |
Other |  | 13 |
Total deferred tax liabilities | 0 | 13 |
Valuation allowance | 11,364 | 5,972 | $ 7,094
Net deferred tax assets | $ 0 | $ 0 |

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