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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]      
Net loss $ (289,403) $ (271,393) $ (164,443)
Other comprehensive gain (loss):      
Unrealized (loss) gain on investment securities (499) 94 13
Foreign currency translation adjustments (6) 1 7
Comprehensive loss $ (289,908) $ (271,298) $ (164,423)