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CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (14,239) $ (6,934) $ (24,298) $ (14,120)
Net unrealized gain on marketable securities 182 254 464 130
Comprehensive loss $ (14,057) $ (6,680) $ (23,834) $ (13,990)