Consolidated Statements of Operations and Other Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
License and collaboration revenue	$ 377,709	$ 60,920	$ 51,844
Revenue, Product and Service [Extensible List]	us-gaap:LicenseMember	us-gaap:LicenseMember	us-gaap:LicenseMember
Operating expenses:
Research and development	$ 437,381	$ 311,594	$ 387,087
General and administrative	116,813	87,805	57,222
Total operating expenses	554,194	399,399	444,309
Loss from operations	(176,485)	(338,479)	(392,465)
Other income (expense):
Change in fair value of derivative liabilities	7,500	23,900	(1,000)
Change in fair value of non-controlling equity investments	(18,592)	20,200	17,690
Change in fair value of contingent consideration liabilities	9,740	18,904	5,146
Interest and other income (expense), net	46,676	15,297	(9)
Total other income (expense)	45,324	78,301	21,827
Net loss before income taxes	(131,161)	(260,178)	(370,638)
Provision for income taxes	(1,366)	(3,410)
Loss from equity method investment		(25,500)
Net loss	(132,527)	(289,088)	(370,638)
Unrealized gain (loss) on marketable securities	3,034	(2,380)	(41)
Comprehensive loss	$ (129,493)	$ (291,468)	$ (370,679)
Net loss per common share, basic	$ (1.72)	$ (4.13)	$ (5.77)
Net loss per common share, diluted	$ (1.72)	$ (4.13)	$ (5.77)
Weighted - average common shares outstanding, basic	77,151,771	70,015,305	64,227,676
Weighted - average common shares outstanding, diluted	77,151,771	70,015,305	64,227,676