Consolidated Statements of Operations and Comprehensive (Loss) Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue:
Total revenue		$ 914,963	$ 719	$ 289,590
Operating expenses:
Research and development	[1]	438,633	266,946	179,362
General and administrative		102,802	88,208	63,488
Total operating expenses		541,435	355,154	242,850
Income (loss) from operations		373,528	(354,435)	46,740
Other income (expense):
Loss from equity method investment				(5,467)
Other income, net		6,003	6,379	26,033
Total other income, net		6,003	6,379	20,566
Net income (loss) before income taxes		379,531	(348,056)	67,306
Provision for income taxes		(1,870)	(809)	(448)
Net income (loss)		377,661	(348,865)	66,858
Foreign currency translation adjustment		(11)	40	15
Unrealized loss on marketable securities		(4,973)	(130)
Comprehensive income (loss)		$ 372,677	$ (348,955)	$ 66,873
Net income (loss) per common share - basic		$ 4.97	$ (5.29)	$ 1.23
Basic weighted-average common shares outstanding		75,948,686	65,949,672	54,392,304
Net income (loss) per common share - diluted		$ 4.70	$ (5.29)	$ 1.17
Diluted weighted-average common shares outstanding		80,393,496	65,949,672	56,932,798
Collaboration Revenue [Member]
Revenue:
Total revenue	[2]	$ 913,081	$ 543	$ 289,590
Grant Revenue [Member]
Revenue:
Total revenue		$ 1,882	$ 176

[1] Including the following amounts of research and development from a related party, see Note 9

[2] Including the following amounts of revenue from a related party, see Note 9