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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2025
Loss Contingencies [Line Items]        
Expense related to 401(k) Plan match contributions   $ 0   $ 0
Loss contingency liability   0   0
Research and development [1] $ 2,473 20,347   $ 43,059
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   $ 0
Loss contingency liability   $ 0   $ 0
[1] Includes related party amount of $6,175 and $21,244 for the three and nine months ended September 30, 2025, respectively, and $2,473 for the period from September 19, 2024 (inception) through September 30, 2024.