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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 $ (27,023) $ (26,217)
Other comprehensive income (loss):    
Unrealized gain on marketable securities available-for-sale 109 8
Cumulative foreign currency translation adjustments 686 (1,294)
Total other comprehensive income (loss) 795 (1,286)
Total comprehensive loss $ (26,228) $ (27,503)