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Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Effective Income Tax Reconciliation [Abstract] |  |  |
Tax at statutory federal income tax rate | $ 1,985 | $ 89 | $ 9,749
Increases (decreases) in tax resulting from: |  |  |
State taxes, net of federal tax benefit | 383 | (52) | 1,805
Permanent differences, net | (839) | (1,406) | (195)
Tax credits | (434) | (195) | (612)
Prior year true-up adjustment | 83 | 397 | (1,274)
Valuation allowance | 331 | 6,716 | (137)
Other provision adjustments | (24) | 49 | 67
Provision for income taxes | $ 1,485 | $ 5,598 | $ 9,403

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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