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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (28,986) $ (23,591) $ (56,009) $ (49,808)
Other comprehensive (loss) income:        
Unrealized (loss) gain on marketable securities available-for-sale (41) (9) 68 (1)
Cumulative foreign currency translation adjustments (383) 237 303 (1,057)
Total other comprehensive (loss) income (424) 228 371 (1,058)
Total comprehensive loss $ (29,410) $ (23,363) $ (55,638) $ (50,866)