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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]      
Net loss $ (245,192) $ (289,403) $ (271,393)
Other comprehensive gain (loss):      
Unrealized gain (loss) on investment securities 24 (499) 94
Foreign currency translation adjustments 3 (6) 1
Comprehensive loss $ (245,165) $ (289,908) $ (271,298)