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Income Taxes - Expense for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current:      
Total $ 1,347 $ 0 $ 0
Deferred:      
Total 0 0 0
Rest of World      
Current:      
Total 1,024 0 0
Deferred:      
Total 0 0 0
United States      
Current:      
Total 323 0 0
Deferred:      
Total $ 0 $ 0 $ 0