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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 35,729 | $ 30,006
Research and development credits | 5,223 | 4,652
Stock-based compensation | 322 | 173
Operating lease liabilities | 661 | 909
Other | 140 | 280
Total gross deferred tax assets | 42,075 | 36,020
Less: Valuation allowance | (41,451) | (35,150)
Total deferred tax assets | 624 | 870
Operating lease right-of-use assets | (624) | (870)
Total deferred tax liabilities | $ (624) | $ (870)

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