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Income Taxes - Components of Income tax (benefit)/expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Current:    
Federal $ 0 $ 0
State 2 0
Foreign 0 0
Total current income tax (benefit) expense 2 0
Deferred:    
Federal 0 0
State 0 0
Foreign 0 0
Total deferred income tax expense (benefit) 0 0
Income tax expense (benefit) $ 2 $ 0