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CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
CONDENSED STATEMENTS OF COMPREHENSIVE LOSS        
Net loss $ (8,637) $ (9,356) $ (17,479) $ (18,671)
Net unrealized gain (loss) on marketable securities 50 (33) 303 34
Comprehensive loss $ (8,587) $ (9,389) $ (17,176) $ (18,637)