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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (62,138) $ (65,248) $ (179,700) $ (220,532)
Other comprehensive gain (loss):        
Unrealized gain (loss) on investment securities 186 25 83 (174)
Foreign currency translation adjustments   (1) 2 (5)
Comprehensive loss $ (61,952) $ (65,224) $ (179,615) $ (220,711)