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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (16,494) $ (5,319)
Change in unrealized gain on available-for-sale securities, net 83 50
Comprehensive loss $ (16,411) $ (5,269)