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Income Taxes - Significant Components of Company's Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |
Tax computed at the federal statutory rate | $ (4,054) | $ (3,447)
State tax, net of federal tax benefit | (122) | (177)
Permanent Items | 261 | 353
Stock options true-up | 81 | 875
Tax credits | (300) | (384)
Valuation allowance increase (decrease) | 4,134 | 2,780
Provision for income taxes | $ 0 | $ 0
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |
Tax computed at the federal statutory rate | 21.00% | 21.00%
State tax, net of federal tax benefit | 1.00% | 1.00%
Permanent Items | (1.00%) | (2.00%)
Stock options true-up | (1.00%) | (5.00%)
Tax credits | 2.00% | 2.00%
Valuation allowance increase (decrease) | (22.00%) | (17.00%)
Provision for income taxes | 0.00% | 0.00%

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