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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (41,978) $ (62,138) $ (182,223) $ (179,700)
Other comprehensive loss:        
Unrealized (loss) gain on investment securities (136) 186 789 83
Foreign currency translation adjustments 2   3 2
Comprehensive loss $ (42,112) $ (61,952) $ (181,431) $ (179,615)