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Segment Disclosures - Schedule of Segment Loss from Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2025
Schedule of Segment Loss from Operations [Line Items]        
Research and development [1] $ 28,988 $ 25,691 $ 49,557 $ 73,000
General and administrative [2] 5,117 3,758 8,248 14,620
Total operating expenses 34,105 29,449 57,805 87,620
Loss from operations (34,105) (29,449) (57,805) (87,620)
Operating Expense Excluding Personnel Related And Stock Based Compensation [Member]        
Schedule of Segment Loss from Operations [Line Items]        
Research and development 3,774 1,304 2,374 9,538
General and administrative 1,945 1,206 3,131 5,356
Allocated ShareBased Compensation Expense [Member}        
Schedule of Segment Loss from Operations [Line Items]        
Research and development 8,341 7,772 8,310 14,712
General and administrative 1,824 1,229 1,459 5,413
External [Member]        
Schedule of Segment Loss from Operations [Line Items]        
Research and development 15,581 15,908 37,926 45,607
Other [Member]        
Schedule of Segment Loss from Operations [Line Items]        
Research and development 1,292 707 947 3,143
Operating Expense Excluding Personnel Related And Stock Based Compensation [Member]        
Schedule of Segment Loss from Operations [Line Items]        
General and administrative $ 1,348 $ 1,323 $ 3,658 $ 3,851
[1] Includes related party amounts of $9,595 and $13,537 for the three months ended September 30, 2025 and September 30, 2024, respectively, and $15,998 and $33,967 for the nine months ended September 30, 2025 and the period from February 6, 2024 (inception) to September 30, 2024, respectively
[2] Includes related party amounts of $8 and $71 for the three months ended September 30, 2025 and September 30, 2024, respectively, and $130 and $1,339 for the nine months ended September 30, 2025 and the period from February 6, 2024 (inception) to September 30, 2024, respectively