Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Collaboration revenue	$ 12,606	$ 11,252
Type of Revenue [Extensible List]	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember
Operating expenses:
Research and development	$ 97,116	$ 133,095
General and administrative	27,448	22,403
Total operating expenses	124,564	155,498
Operating loss	(111,958)	(144,246)
Other income (expense), net:
Interest income	11,980	540
Loss from equity method investment	(3,048)	(2,745)
Change in fair value of contingent consideration	(100)	(421)
Total other income (expense), net	8,832	(2,626)
Net loss	$ (103,126)	$ (146,872)
Net loss per share, basic	$ (1.17)	$ (1.96)
Net loss per share, diluted	$ (1.17)	$ (1.96)
Weighted average shares outstanding, basic	87,772	74,751
Weighted average shares outstanding, diluted	87,772	74,751
Other comprehensive loss:
Unrealized gain (loss) on marketable securities	$ 2,989	$ (5,128)
Other comprehensive gain (loss) from equity method investment	1,794	(302)
Comprehensive loss	$ (98,343)	$ (152,302)