Statements of Operations - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating expenses:
Research and development (including related party expenses of $0, $0 and $2,359 in 2023, 2022 and 2021, respectively)		$ 332,341	$ 169,451	$ 78,411
Acquired manufacturing rights (Note 7)		75,000	22,995	0
General and administrative		60,700	39,810	25,259
Total operating expenses		468,041	232,256	103,670
Loss from operations		(468,041)	(232,256)	(103,670)
Other income (expense), net:
Interest expense		0	(2)	(7)
Interest income		62,907	8,356	344
Grant income		4,765	1,931	1,585
Realized gains on marketable securities		0	0	2
Loss on disposal of fixed assets		0	(44)	0
Foreign currency transaction (losses) gains		(1,897)	(1,470)	1,669
Total other income, net		65,775	8,771	3,593
Net loss		$ (402,266)	$ (223,485)	$ (100,077)
Net loss per share, basic		$ (4.14)	$ (3.44)	$ (1.93)
Net loss per share, diluted		$ (4.14)	$ (3.44)	$ (1.93)
Weighted-average shares outstanding, basic	[1]	97,157,690	64,877,988	51,922,108
Weighted-average shares outstanding, diluted	[1]	97,157,690	64,877,988	51,922,108

[1] Includes shares of common stock into which pre-funded warrants may be exercised. See Note 9, “Pre-Funded Warrants.”