Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Collaboration revenue	$ 9,111	$ 11,992	$ 45,003	$ 38,192
Type of Revenue [Extensible List]	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember
Operating expenses:
Research and development	$ 123,380	$ 113,696	$ 349,434	$ 326,088
General and administrative	30,501	29,403	93,385	87,503
Total operating expenses	153,881	143,099	442,819	413,591
Operating loss	(144,770)	(131,107)	(397,816)	(375,399)
Other income (expense), net:
Interest income	12,122	12,740	37,176	37,373
Change in fair value of investments, net	(3,064)	0	(29,483)	0
Loss from equity method investment	0	(3,857)	0	(10,905)
Change in fair value of contingent consideration	0	0	0	(100)
Total other income , net	9,058	8,883	7,693	26,368
Net loss	$ (135,712)	$ (122,224)	$ (390,123)	$ (349,031)
Net loss per share, basic	$ (1.34)	$ (1.38)	$ (3.99)	$ (3.96)
Net loss per share, diluted	$ (1.34)	$ (1.38)	$ (3.99)	$ (3.96)
Weighted average shares outstanding, basic	101,002	88,645	97,842	88,204
Weighted average shares outstanding, diluted	101,002	88,645	97,842	88,204
Other comprehensive income:
Unrealized gain on marketable securities	$ 4,452	$ 142	$ 3,423	$ 1,649
Other comprehensive gain from equity method investment	0	154	0	2,240
Comprehensive loss	$ (131,260)	$ (121,928)	$ (386,700)	$ (345,142)