Commitments and Contingencies (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Dec. 31, 2024	Dec. 31, 2025
Loss Contingencies [Line Items]
Expense related to 401(k) Plan match contributions			$ 0
Loss contingency liability		$ 0	0
Research and development	[1]	14,034	$ 138,086
Cell Line License Agreement | WuXi Biologics Ireland Limited
Loss Contingencies [Line Items]
Research and development		$ 150
Percent of net sales, royalty payment (less than)		1.00%
Option agreement, termination period			6 months
Option agreement termination period due to breach of contract			60 days
Option agreement termination period due to failure to pay			30 days
Indemnification Agreement
Loss Contingencies [Line Items]
Losses incurred to date			$ 0
Loss contingency liability			$ 0

[1] Includes related party amount of $23,653 for the twelve months ended months ended December 31, 2025 and $13,185 for the period from September 19, 2024 (inception) through December 31, 2024.