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Income Taxes - Reconciliation of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of Provision (Benefit) for Income Taxes [Abstract] |  |
Tax provision at expected statutory rate | $ 3,939 | $ 274
State taxes, net of federal benefit | 448 | 31
Permanent differences | (271) | 45
Tax credits | (116) | (125)
Tax credit expiration | 0 | 132
Foreign tax expense, and other | (7) | 1
Change in rate | 0 | (38)
Change in valuation allowance | (379) | (9)
Change in uncertain tax positions | 458 | 0
Provision to return | 13 | 15
Other | 33 | 10
Income tax provision | $ 4,118 | $ 336
Effective tax rate | 22.00% | 25.80%

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