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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: |  |
Net operating loss carryforwards | $ 5,409 | $ 3,031
Reserves, accruals and other | 198 | 239
Depreciation and amortization | 917 | 1,284
Deferred stock based compensation | 2,691 | 2,698
Research and development credit carryforwards | 6,675 | 6,613
Total deferred tax assets | 15,890 | 13,865
Less: Valuation allowance | $ (15,890) | $ (13,865)

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