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Comprehensive Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss)      
Beginning balance $ (29,199) $ 2,780 $ 85,580
Net other comprehensive income (loss) 8,783 (32,616) (95,454)
Ending balance 162,266 (29,199) 2,780
Unrealized gain (loss) on marketable securities, tax (202) (43) (18)
Foreign currency translation adjustment      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance (23,738) (23,621) (23,202)
Net other comprehensive income (loss) 1,111 (117) (419)
Ending balance (22,627) (23,738) (23,621)
Unrealized gain (loss) on marketable securities, net      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance 932 205 (64)
Net other comprehensive income (loss) 644 727 269
Ending balance 1,576 932 205
Accumulated other comprehensive loss      
Accumulated Other Comprehensive Income (Loss)      
Beginning balance (22,806) (23,416) (23,266)
Ending balance $ (21,051) $ (22,806) $ (23,416)