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STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]      
Net loss $ (75,617) $ (68,548) $ (27,017)
Net unrealized (loss) gain on marketable securities (54) 315 24
Comprehensive loss $ (75,671) $ (68,233) $ (26,993)