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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

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