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CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
CONDENSED STATEMENTS OF COMPREHENSIVE LOSS        
Net loss $ (6,405) $ (8,637) $ (13,588) $ (17,479)
Net unrealized (loss) gain on marketable securities (8) 50 (26) 303
Comprehensive loss $ (6,413) $ (8,587) $ (13,614) $ (17,176)