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Income Taxes - Current and deferred expense for income tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Current expense (benefit):    
Foreign $ 40  
Total current expense (benefit): 40  
Deferred expense (benefit):    
Foreign (42) $ (3)
Total deferred expense (benefit): (42) (3)
Total income tax expense (benefit): $ (2) $ (3)