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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (66,448) $ (88,023)
Other comprehensive income:    
Unrealized (loss) gain on investment securities (6) 1,226
Foreign currency translation adjustments 4 2
Comprehensive loss $ (66,450) $ (86,795)