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Income Taxes - Temporary Differences (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Accrued expenses and other reserves | $ 1,787 | $ 1,505
Right-of-use-asset | (225) | (378)
Lease liabilities | 271 | 461
Tax credits, deferred R&D, and other | 20 | 44
Net operating loss | 14,510 | 12,758
Valuation allowance | (16,363) | (14,390)
Net deferred tax assets | $ 0 | $ 0

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