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Condensed Consolidated Statements of Comprehensive Loss - 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 $ (18,965) $ (9,245) $ (62,034) $ (26,690)
Change in unrealized gain (loss) on available-for-sale securities, net (14) 57 77 79
Comprehensive loss $ (18,979) $ (9,188) $ (61,957) $ (26,611)