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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (24,154) $ (45,098) $ (27,678) $ (34,410)
Other comprehensive income (loss):        
Foreign currency translation adjustments (184) (1,000) (446) 1,213
Available-for-sale investments:        
Unrealized gain (loss) on investments, net of tax effect (144) 191 745 534
Reclassification from accumulated other comprehensive loss 19 (182) 19 (212)
Net change in unrealized gain (loss) on available-for-sale investments (125) 9 764 322
Other comprehensive income (loss), net of taxes (309) (991) 318 1,535
Comprehensive loss $ (24,463) $ (46,089) $ (27,360) $ (32,875)