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Income Tax - Significant components of the provision for income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Current income tax benefit:    
Federal United States $ 0 $ (215)
State - United States 0 2
Non-United States 0 0
Total 0 (213)
Federal - United States 0 0
State - United States 0 0
Non-United States 0 0
Total deferred tax 0 0
Total income tax benefit $ 0 $ (213)