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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Tax loss carryforwards | $ 47,902 | $ 42,331
Research and development credits and other tax credits | 4,035 | 3,904
Stock-based compensation | 962 | 684
Other | 1,750 | 1,116
Total deferred tax assets | 54,649 | 48,035
Deferred tax liabilities: |  |
Operating lease right-of-use assets | (611) | (74)
Other | 0 | (6)
Total deferred tax liabilities | (611) | (80)
Net deferred tax assets before valuation allowance | 54,038 | 47,955
Valuation allowance | (54,038) | (47,955)
Net deferred tax asset | $ 0 | $ 0

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