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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (33,161) $ (27,841)
Other comprehensive income (loss):    
Foreign currency translation adjustments (255) (642)
Available-for-sale investments:    
Unrealized gain on investments, net of tax effect 179 589
Reclassification from accumulated other comprehensive loss 16 0
Net change in unrealized gain on available-for-sale investments 195 589
Other comprehensive loss, net of taxes (60) (53)
Comprehensive loss $ (33,221) $ (27,894)