Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2025
Amount
U.S. Federal statutory tax rate	$ (3,752)	$ (31,908)
Withholding taxes	0	2,000
Tax credits	(46)	(1,809)
Change in valuation allowance	3,612	34,697
Nontaxable or nondeductible items	186	870
Tax deductible merger expenses	0	(1,850)
Total income tax expense	$ 0	$ 2,000
Percent
U.S. Federal statutory tax rate	21.00%	21.00%
Withholding taxes	0.00%	(1.30%)
Tax credits	0.30%	1.20%
Change in valuation allowance	(20.20%)	(22.90%)
Nontaxable or nondeductible items	(1.00%)	(0.60%)
Tax deductible merger expenses	0.00%	1.20%
Effective income tax rate	0.10%	(1.40%)