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Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statements of Operations        
License and collaboration revenue - related party $ 10,286,000 $ 13,114,000 $ 18,740,000 $ 22,978,000
Revenue from Contract with Customer, Product and Service [Extensible List] usgaap:LicenseAndServiceMember usgaap:LicenseAndServiceMember usgaap:LicenseAndServiceMember usgaap:LicenseAndServiceMember
Operating expenses:        
Research and development $ 36,956,000 $ 15,995,000 $ 87,633,000 $ 55,020,000
General and administrative 7,256,000 4,891,000 19,936,000 13,644,000
Total operating expenses 44,212,000 20,886,000 107,569,000 68,664,000
Loss from operations (33,926,000) (7,772,000) (88,829,000) (45,686,000)
Interest income 122,000 87,000 321,000 820,000
Interest expense   (19,000)   (471,000)
Loss on early repayment of debt       (585,000)
Other expense, net   (59,000) (136,000) (37,000)
Loss before income tax expense (33,804,000) (7,763,000) (88,644,000) (45,959,000)
Income tax expense 0   0 (1,305,000)
Net loss $ (33,804,000) $ (7,763,000) $ (88,644,000) $ (47,264,000)
Net loss per share, basic and diluted $ (0.70) $ (0.21) $ (1.94) $ (1.45)
Weighted-average shares used to compute net loss per share, basic and diluted 47,987,184 37,386,881 45,705,782 32,647,524