Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Collaboration revenue	$ 28,935	$ 12,606
Type of Revenue [Extensible List]	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember
Operating expenses:
Research and development	$ 111,847	$ 97,116
General and administrative	31,091	27,448
Total operating expenses	142,938	124,564
Operating loss	(114,003)	(111,958)
Other income (expense), net:
Interest income	12,632	11,980
Change in fair value of investments, net	(6,065)	0
Loss from equity method investment	0	(3,048)
Change in fair value of contingent consideration	0	(100)
Total other income (expense), net	6,567	8,832
Net loss	$ (107,436)	$ (103,126)
Net loss per share, basic	$ (1.12)	$ (1.17)
Net loss per share, diluted	$ (1.12)	$ (1.17)
Weighted average shares outstanding, basic	95,502	87,772
Weighted average shares outstanding, diluted	95,502	87,772
Other comprehensive (loss) gain:
Unrealized gain (loss) on marketable securities	$ (821)	$ 2,989
Other comprehensive gain - equity method investment	0	1,794
Comprehensive loss	$ (108,257)	$ (98,343)