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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (84,660) $ (41,978) $ (214,824) $ (182,223)
Other comprehensive income (loss):        
Unrealized (loss) gain on investment securities (967) (136) 216 789
Foreign currency translation adjustments (4) 2 (4) 3
Comprehensive loss $ (85,631) $ (42,112) $ (214,612) $ (181,431)