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Consolidated Statements 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
Income Statement [Abstract]        
Revenue—related party $ 3,429 $ 3,028 $ 4,262 $ 12,493
Operating expenses:        
Research and development 11,926 8,942 34,285 24,651
General and administrative 5,213 7,741 15,868 17,684
Total operating expenses 17,139 16,683 50,153 42,335
Loss from operations (13,710) (13,655) (45,891) (29,842)
Interest income 4 153 54 704
Interest expense (50) (50) (151) (84)
Other income (expense), net (246) (1,224) (312) (1,174)
Loss before income tax expense (benefit) (14,002) (14,776) (46,300) (30,396)
Income tax expense (benefit) 11 3 (114) (2,676)
Net loss $ (14,013) $ (14,779) $ (46,186) $ (27,720)
Net loss per share attributable to common stockholders, basic and diluted $ (0.44) $ (2.84) $ (1.54) $ (8.69)
Weighted-average common shares used in computing net loss per share attributable to common stockholders, basic and diluted 31,876,016 5,208,887 29,954,616 3,190,557
Other comprehensive income (loss):        
Unrealized (loss) gain on marketable debt securities, net of tax $ 0 $ (114) $ (24) $ 60
Total other comprehensive (loss) income 0 (114) (24) 60
Comprehensive loss $ (14,013) $ (14,893) $ (46,210) $ (27,660)