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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - 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 $ (47,108) $ (21,506) $ (141,534) $ (66,067)
Other comprehensive gain (loss):        
Unrealized gain (loss) on available-for-sale investments 7 (151) (83) 39
Cumulative translation adjustments 0 5 (6) (4)
Comprehensive loss $ (47,101) $ (21,652) $ (141,623) $ (66,024)