Summary of Significant Accounting Policies - Segment Reporting - Reconciliation of company's net income (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jan. 07, 2025	Jan. 06, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment operating expenses:
Research and development			$ 1,064	$ 4,439	$ 1,889	$ 10,172
Change in fair value of contingent consideration			16	(161,233)	(3,472)	(97,464)
Total operating costs and expenses			4,338	(153,473)	4,800	(79,322)
(Loss) income from operations			(4,338)	153,473	(4,800)	79,322
Other segment items:
Change in fair value of convertible notes			(1,854)	1,795	(3,485)	1,708
Change in fair value of warrants			542	(5,905)	(86,187)	14,999
Loss on issuance of warrants	$ (75,600)	$ 75,600			(75,644)
Loss on embedded forward purchase agreements and derivative liabilities, net				(2,905)		20,012
Other income, net			92	34	195	75
Total other (loss) income, net			(2,304)	10,639	7,253	(33,228)
(Loss) income before taxes			(6,642)	164,112	2,453	46,094
Net (loss) income			(6,642)	164,112	2,453	46,094
Single reportable segment
Segment operating expenses:
Compensation and benefits			2,505	2,623	4,894	5,463
Professional and legal fees			1,167	1,174	2,386	3,718
Office and travel			285	418	515	798
Research and development			365	3,545	477	8,163
Total selling, general and administrative, and research and development			4,322	7,760	8,272	18,142
Change in fair value of contingent consideration			16	(161,233)	(3,472)	(97,464)
Total operating costs and expenses			4,338	(153,473)	4,800	(79,322)
(Loss) income from operations			(4,338)	153,473	(4,800)	79,322
Other segment items:
Change in fair value of convertible notes			(1,854)	1,795	(3,485)	1,708
Change in fair value of warrants			(542)	5,905	86,187	(14,999)
Loss on issuance of warrants					(75,644)
Loss on embedded forward purchase agreements and derivative liabilities, net				2,905		(20,012)
Other income, net			92	34	195	75
Total other (loss) income, net			(2,304)	10,639	7,253	(33,228)
(Loss) income before taxes			(6,642)	164,112	2,453	46,094
Net (loss) income			$ (6,642)	$ 164,112	$ 2,453	$ 46,094