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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current:      
Federal $ 0 $ 0 $ 0
State 87 0 0
Total current 87 0 0
Deferred:      
Federal 42 0 0
State 43 0 0
Total deferred 85 0 0
Total provision for income taxes $ 172 $ 0 $ 0