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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits-beginning of period $ 178 $ 182 $ 191
Foreign currency adjustments 17    
Foreign currency adjustments   (4) (9)
Unrecognized tax benefits-end of period 195 178 182
Interest and penalties $ 0 $ 0 $ 0