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Segment Disclosures - Schedule of Segment Loss from Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 5 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2024
Jun. 30, 2025
Schedule of Segment Loss from Operations [Line Items]        
Research and development personnel-related expense (excluding stock-based compensation) [1] $ 24,087 $ 18,673 $ 23,866 $ 44,012
General and administrative personnel-related expense (excluding stock-based compensation) [2] 4,342 2,820 4,490 9,503
Total operating expenses 28,429 21,493 28,356 53,515
Loss from operations (28,429) (21,493) (28,356) (53,515)
Operating Expense Excluding Personnel Related And Stock Based Compensation [Member]        
Schedule of Segment Loss from Operations [Line Items]        
Research and development personnel-related expense (excluding stock-based compensation) 3,301 876 1,070 5,764
General and administrative personnel-related expense (excluding stock-based compensation) 1,717 1,159 1,925 3,411
Allocated ShareBased Compensation Expense [Member}        
Schedule of Segment Loss from Operations [Line Items]        
Research and development personnel-related expense (excluding stock-based compensation) 3,368 468 538 6,371
General and administrative personnel-related expense (excluding stock-based compensation) 1,709 215 230 3,589
External [Member]        
Schedule of Segment Loss from Operations [Line Items]        
Research and development personnel-related expense (excluding stock-based compensation) 16,416 17,113 22,018 30,026
Other [Member]        
Schedule of Segment Loss from Operations [Line Items]        
Research and development personnel-related expense (excluding stock-based compensation) 1,002 216 240 1,851
Operating Expense Excluding Personnel Related And Stock Based Compensation [Member]        
Schedule of Segment Loss from Operations [Line Items]        
General and administrative personnel-related expense (excluding stock-based compensation) $ 916 $ 1,446 $ 2,335 $ 2,503
[1] Includes related party amounts of $4,281 and $15,379 for the three months ended June 30, 2025 and June 30, 2024, respectively, and $6,403 and $20,430 for the six months ended June 30, 2025 and the period from February 6, 2024 (inception) to June 30, 2024, respectively
[2] Includes related party amounts of $12 and $420 for the three months ended June 30, 2025 and June 30, 2024, respectively, and $122 and $1,268 for the six months ended June 30, 2025 and the period from February 6, 2024 (inception) to June 30, 2024, respectively