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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Federal and state loss carryforwards | $ 3,031 | $ 1,697
Reserves, accruals and other | 239 | 156
Depreciation and amortization | 1,284 | 1,629
Deferred stock-based compensation | 2,698 | 2,613
Research and development credit carryforwards | 6,613 | 6,707
Foreign tax and other credits |  | 61
Total deferred tax assets | 13,865 | 12,863
Less: Valuation allowance | $ (13,865) | (12,802)
Net deferred tax assets |  | $ 61

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