Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue:
Total revenue	$ 892	$ 517	$ 1,757	$ 1,021
Operating expenses:
Research and development	69,894	80,165	142,378	156,338
Acquired in-process research and development	96,253	0	96,253	0
General and administrative	18,916	19,481	38,212	37,434
Collaboration expense, net	45,153	52,131	102,662	99,097
Total operating expenses	230,216	151,777	379,505	292,869
Loss from operations	(229,324)	(151,260)	(377,748)	(291,848)
Other income:
Other income, net	22,067	26,139	35,604	50,860
Total other income, net	22,067	26,139	35,604	50,860
Net loss before income taxes	(207,257)	(125,121)	(342,144)	(240,988)
Provision for income taxes	(1,292)	(1,287)	(2,401)	(2,011)
Net loss	(208,549)	(126,408)	(344,545)	(242,999)
Foreign currency translation adjustment	80	2	121	(9)
Unrealized (loss) gain on marketable securities	(174)	(1,329)	2,080	(4,783)
Comprehensive loss	$ (208,643)	$ (127,735)	$ (342,344)	$ (247,791)
Net loss per common share - basic	$ (2.4)	$ (1.49)	$ (3.98)	$ (2.92)
Basic weighted-average common shares outstanding	87,069,690	84,920,929	86,507,330	83,357,780
Net loss per common share - diluted	$ (2.4)	$ (1.49)	$ (3.98)	$ (2.92)
Diluted weighted-average common shares outstanding	87,069,690	84,920,929	86,507,330	83,357,780
Collaboration Revenue [Member]
Revenue:
Total revenue	$ 0	$ 0	$ 0	$ 0
Grant Revenue [Member]
Revenue:
Total revenue	$ 892	$ 517	$ 1,757	$ 1,021