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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

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