Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue:
License and other revenue		$ 119	$ 10,007	$ 345
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember
Total revenue		$ 119	$ 10,007	$ 345
Operating expenses:
Research and development expenses	$ 91,992	88,201	174,395	171,028
Change in fair value of contingent consideration liability	(11,374)	(2,152)	(13,206)	(3,155)
General and administrative expenses	20,139	20,120	39,938	39,699
Total operating expenses	100,757	106,169	201,127	207,572
Loss from operations	(100,757)	(106,050)	(191,120)	(207,227)
Other income:
Interest income	8,547	7,559	17,498	14,500
Other (expense) income	(2)	(14)	23	(17)
Total other income, net	8,545	7,545	17,521	14,483
Net loss	$ (92,212)	$ (98,505)	$ (173,599)	$ (192,744)
Net loss per share, basic	$ (0.69)	$ (0.81)	$ (1.32)	$ (1.59)
Net loss per share, diluted	$ (0.69)	$ (0.81)	$ (1.32)	$ (1.59)
Weighted average shares of common stock, basic	132,821,826	121,680,844	131,832,420	121,501,849
Weighted average shares of common stock, diluted	132,821,826	121,680,844	131,832,420	121,501,849
Other comprehensive (loss) income:
Unrealized holding (loss) gain	$ (182)	$ (279)	$ (1,144)	$ 4,339
Total other comprehensive (loss) income	(182)	(279)	(1,144)	4,339
Total comprehensive loss	$ (92,394)	$ (98,784)	$ (174,743)	$ (188,405)