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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Current:    
State $ 1 $ 1
Total current provision 1 1
Deferred:    
Federal (5,551) (4,043)
State (531) (92)
Total deferred (benefit) expense (6,082) (4,135)
Valuation allowance 6,081 4,134
Total income tax provision $ 0 $ 0