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CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CONDENSED STATEMENTS OF COMPREHENSIVE LOSS    
Net loss $ (8,842) $ (9,315)
Net unrealized gain on marketable securities 253 67
Comprehensive loss $ (8,589) $ (9,248)