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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 $ (25,287) $ (27,023)
Other comprehensive income:    
Unrealized (loss) gain on marketable securities available-for-sale (29) 109
Cumulative foreign currency translation adjustments 303 686
Total other comprehensive income 274 795
Total comprehensive loss $ (25,013) $ (26,228)