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CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (6,934) $ (6,405) $ (14,120) $ (13,588)
Net unrealized gain (loss) on marketable securities 254 (8) 130 (26)
Comprehensive loss $ (6,680) $ (6,413) $ (13,990) $ (13,614)