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CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (6,899) $ (3,576) $ (20,487) $ (21,055)
Net unrealized gain (loss) on marketable securities 27 (65) 1 238
Comprehensive loss $ (6,872) $ (3,641) $ (20,486) $ (20,817)