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CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (16,355) $ (10,059)
Net unrealized (loss) gain on marketable securities (256) 282
Comprehensive loss $ (16,611) $ (9,777)