Income Taxes - Summary of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Jun. 17, 2024
Income Taxes
Net operating loss carryforwards	$ 11,560	$ 449
Research and development credits	1,542	255
Capitalized start-up expenses	375	396
Accruals and reserves	952	171
Capitalized R&D	34,195	6,055
Stock based compensation	923	230
Deferred rent	412
Property and equipment	8
Other	2
Gross deferred tax assets	49,969	7,556
Valuation allowance	(49,571)	$ (7,556)	$ 0
Total deferred tax assets	398
Right-of-use asset	(351)
Other	(8)
Total deferred tax liabilities	(359)
Net deferred tax assets	$ 39