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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Collaboration revenue [1] $ 7,204 $ 22,220 $ 20,199 $ 51,399
Type of Revenue [Extensible List] us-gaap:LicenseAndServiceMember us-gaap:LicenseAndServiceMember us-gaap:LicenseAndServiceMember us-gaap:LicenseAndServiceMember
Operating expenses:        
Research and development $ 60,486 $ 39,756 $ 158,646 $ 112,177
General and administrative 18,711 10,566 48,988 33,406
Total operating expenses 79,197 50,322 207,634 145,583
Operating loss (71,993) (28,102) (187,435) (94,184)
Interest income 349 262 780 2,145
Net loss $ (71,644) $ (27,840) $ (186,655) $ (92,039)
Net loss per share, basic and diluted $ (0.97) $ (0.47) $ (2.68) $ (1.70)
Weighted average shares outstanding, basic and diluted 73,706 58,754 69,720 54,218
Other comprehensive loss:        
Unrealized loss on marketable securities $ (161) $ (124) $ (175) $ (230)
Comprehensive loss $ (71,805) $ (27,964) $ (186,830) $ (92,269)
[1] Including the following revenue from related party (see Notes 7 and 8):