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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (54,941) $ (63,266) $ (140,245) $ (117,562)
Other comprehensive loss:        
Unrealized gain (loss) on investment securities 348 195 925 (103)
Foreign currency translation adjustments (1) 4 1 2
Comprehensive loss $ (54,594) $ (63,067) $ (139,319) $ (117,663)