Condensed Consolidated Statements of Operations - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue:
Total revenue		$ 0	$ 174	$ 886	$ 2,161
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]		Development Fee and Royalty [Member]	Development Fee and Royalty [Member]	Development Fee and Royalty [Member]	Development Fee and Royalty [Member]
Operating expenses (income):
Research and development	[1]	$ 24,660	$ 11,977	$ 55,822	$ 44,328
General and administrative		8,584	6,952	25,874	23,452
Acquired in-process research and development		(298)	0	130,188	0
Gain recognized within operating expenses		(14,609)	0	(14,609)	0
Total operating expenses		18,337	18,929	197,275	67,780
Loss from operations		(18,337)	(18,755)	(196,389)	(65,619)
Other (expense) income:
Interest income		1,251	288	2,021	427
Other income, net		2,342	24	2,262	25
Total other (expense) income		(21,767)	312	(79,247)	452
Loss before income tax expense		(40,104)	(18,443)	(275,636)	(65,167)
Income tax (expense) benefit		(3)	209	26	174
Net loss		$ (40,107)	$ (18,234)	$ (275,610)	$ (64,993)
Net loss per share, basic (in dollars per share)		$ (9.34)	$ (4.84)	$ (69.57)	$ (20.17)
Net loss per share, diluted (in dollars per share)		$ (9.34)	$ (4.84)	$ (69.57)	$ (20.17)
Weighted-average common shares outstanding, basic (in dollars per share)		4,293,812	3,767,918	3,961,546	3,222,987
Weighted-average common shares outstanding, diluted (in dollars per share)		4,293,812	3,767,918	3,961,546	3,222,987
Forward contract liability
Other (expense) income:
Change in fair value of forward contract liability		$ (25,360)	$ 0	$ (83,530)	$ 0

[1] Includes $19.4 million and $20.8 million in related party expenses for the three and nine months ended September 30, 2023, respectively and no related party expenses for the three and nine months ended September 30, 2022.