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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (63,266) $ (67,441) $ (117,562) $ (155,284)
Other comprehensive gain (loss):        
Unrealized gain (loss) on investment securities 195 (188) (103) (199)
Foreign currency translation adjustments 4 (3) 2 (4)
Comprehensive loss $ (63,067) $ (67,632) $ (117,663) $ (155,487)