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STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]      
Net loss $ (68,548) $ (27,017) $ (27,916)
Net unrealized gain (loss) on marketable securities 315 24 (154)
Comprehensive loss $ (68,233) $ (26,993) $ (28,070)