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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 Comprehensive Income [Abstract]        
Net loss $ (28,946) $ (24,460) $ (75,637) $ (36,549)
Other comprehensive (loss) income:        
Unrealized (loss) gain on marketable securities (133) 40 182 41
Total comprehensive loss $ (29,079) $ (24,420) $ (75,455) $ (36,508)