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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (27,841) $ (46,367)
Other comprehensive income (loss):    
Foreign currency translation adjustments (642) 1,705
Available-for-sale investments:    
Unrealized gain on investments, net of tax effect 589 711
Reclassification from accumulated other comprehensive loss 0 (5)
Net change in unrealized loss on available-for-sale investments 589 706
Other comprehensive income, net of taxes (53) 2,411
Comprehensive loss $ (27,894) $ (43,956)