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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (14,457) $ (84,660) $ (124,776) $ (214,824)
Other comprehensive income:        
Unrealized (loss) gain on investment securities (41) (967) (43) 216
Foreign currency translation adjustments 3 (4) 6 (4)
Comprehensive loss $ (14,495) $ (85,631) $ (124,813) $ (214,612)