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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current:      
Federal $ 200 $ 0 $ 0
State 1,230 1,250 436
Current income tax expense (benefit) 1,430 1,250 436
Deferred:      
Federal 0 0 0
State 0 0 0
Deferred tax expense (benefit) 0 0 0
Income tax provision $ 1,430 $ 1,250 $ 436