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:
Total revenue	$ 517	$ 70,000	$ 1,021	$ 170,000
Operating expenses:
Research and development	80,165	101,555	156,338	201,490
General and administrative	19,481	19,032	37,434	41,392
Collaboration expense, net	52,131	44,636	99,097	86,828
Total operating expenses	151,777	165,223	292,869	329,710
Loss from operations	(151,260)	(95,223)	(291,848)	(159,710)
Other income:
Other income, net	26,139	18,406	50,860	31,148
Total other income, net	26,139	18,406	50,860	31,148
Net loss before income taxes	(125,121)	(76,817)	(240,988)	(128,562)
Provision for income taxes	(1,287)	(923)	(2,011)	(2,243)
Net loss	(126,408)	(77,740)	(242,999)	(130,805)
Foreign currency translation adjustment	2	28	(9)	60
Unrealized (loss) gain on marketable securities	(1,329)	452	(4,783)	6,679
Comprehensive loss	$ (127,735)	$ (77,260)	$ (247,791)	$ (124,066)
Net loss per common share - basic	$ (1.49)	$ (0.98)	$ (2.92)	$ (1.66)
Basic weighted-average common shares outstanding	84,920,929	79,091,061	83,357,780	78,885,168
Net loss per common share - diluted	$ (1.49)	$ (0.98)	$ (2.92)	$ (1.66)
Diluted weighted-average common shares outstanding	84,920,929	79,091,061	83,357,780	78,885,168
Collaboration Revenue [Member]
Revenue:
Total revenue	$ 0	$ 70,000	$ 0	$ 170,000
Grant Revenue [Member]
Revenue:
Total revenue	$ 517	$ 0	$ 1,021	$ 0