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Other Comprehensive Income (Loss) - Accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss)      
Accumulated other comprehensive income (loss), balance at beginning of period, net $ (18) $ (874)  
Foreign currency translation adjustments (827) 223 $ (1,343)
Foreign currency translation adjustments, net of tax (766)    
Other comprehensive income (loss) before reclassification (22) 862  
Amounts reclassified from accumulated other comprehensive income (loss) (49) (229)  
Accumulated other comprehensive income (loss), balance at end of period, net (855) (18) (874)
Foreign Currency Translation Adjustment      
Accumulated Other Comprehensive Income (Loss)      
Accumulated other comprehensive income (loss), balance at beginning of period, net (93) (316)  
Foreign currency translation adjustments   223  
Foreign currency translation adjustments, net of tax (766)    
Accumulated other comprehensive income (loss), balance at end of period, net (859) (93) (316)
Unrealized/Recognized Gains (Losses)      
Accumulated Other Comprehensive Income (Loss)      
Accumulated other comprehensive income (loss), balance at beginning of period, net 75 (558)  
Other comprehensive income (loss) before reclassification (22) 862  
Amounts reclassified from accumulated other comprehensive income (loss) (49) (229)  
Accumulated other comprehensive income (loss), balance at end of period, net $ 4 $ 75 $ (558)