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Condensed Consolidated Statement of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Revenue $ 2,755 $ 1,070 $ 7,828 $ 5,444
Operating expenses (income):        
Research and development 31,433 24,501 119,408 147,153
General and administrative 21,241 13,570 57,184 32,012
Other operating income, net (758) (158) (1,526) (1,308)
Total operating expenses 51,916 37,913 175,066 177,857
Loss from operations (49,161) (36,843) (167,238) (172,413)
Interest income 270 1,096 842 5,318
Other income (expense), net 16 28 (117) 1,480
Net loss (48,875) (35,719) (166,513) (165,615)
Other comprehensive (loss) gain:        
Net unrealized gain (loss) on marketable securities (138) (598) (321) 139
Net comprehensive loss (49,013) (36,317) (166,834) (165,476)
Net loss attributed to common stockholders:        
Net loss (48,875) (35,719) (166,513) (165,615)
Deemed dividends upon repurchase of convertible preferred stock       (3,582)
Net loss attributed to common stockholders $ (48,875) $ (35,719) $ (166,513) $ (169,197)
Net loss per common share, basic and diluted $ (0.20) $ (2.57) $ (1.66) $ (13.40)
Weighted-average shares used to compute net loss per common share, basic and diluted 239,384 13,893 100,603 12,625