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Income Taxes - Benefit (Provision) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income tax benefit (provision): |  |  |
Federal | $ 18,513 | $ 16,615 | $ 13,869
State | 7,082 | 5,802 | 2,170
Expiration of NOLs and R&D Credit | (14,210) | (20,294) | (18,966)
Income tax benefit (provision) before valuation allowance | 11,385 | 2,123 | (2,927)
Deferred tax valuation allowance | (11,158) | (956) | $ 2,927
Income tax benefit (provision) | $ 227 | $ 1,167 |

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