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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Federal and state loss carryforwards | $ 1,697 | $ 681
Reserves, accruals and other | 156 | 230
Depreciation and amortization | 1,629 | 1,901
Deferred stock-based compensation | 2,613 | 2,571
Research and development credit carryforwards | 6,707 | 6,537
Foreign tax and other credits | 61 | 242
Total deferred tax assets | 12,863 | 12,162
Deferred tax liabilities: |  |
Less: Valuation allowance | (12,802) | (11,920)
Net deferred tax assets | $ 61 | $ 242

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