Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Collaboration revenue	$ 52,121	$ 33,053	$ 57,994
Type of Revenue [Extensible List]	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember	us-gaap:LicenseAndServiceMember
Operating expenses:
Research and development	$ 419,979	$ 229,807	$ 150,408
General and administrative	90,306	71,096	44,169
Total operating expenses	510,285	300,903	194,577
Operating loss	(458,164)	(267,850)	(136,583)
Other (expense) income, net:
Interest income	8,542	1,283	2,352
Loss from equity method investments	(11,079)	(1,325)	0
Change in fair value of contingent consideration	(13,485)	0	0
Total other (expense) income, net	(16,022)	(42)	2,352
Net loss	$ (474,186)	$ (267,892)	$ (134,231)
Net Loss Per Share, Basic	$ (6.16)	$ (3.78)	$ (2.40)
Net Loss Per Share, Diluted	$ (6.16)	$ (3.78)	$ (2.40)
Weighted average shares outstanding, basic	76,972	70,894	55,987
Weighted average shares outstanding, diluted	76,972	70,894	55,987
Other comprehensive loss:
Unrealized loss on marketable securities	$ (1,637)	$ (2,126)	$ (260)
Other comprehensive loss from equity method investment	(3,192)	(507)	0
Comprehensive loss	$ (479,015)	$ (270,525)	$ (134,491)