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Income Taxes - Current and deferred expense for income tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Current expense (benefit):    
Foreign $ (37) $ 40
Total current expense (benefit): (37) 40
Deferred expense (benefit):    
Foreign 13 (42)
Total deferred expense (benefit): 13 (42)
Total income tax expense (benefit): $ (24) $ (2)