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Segment Disclosures - Schedule of Segment Loss from Operations (Details)
$ in Thousands
11 Months Ended
Dec. 31, 2024
USD ($)
Schedule of Segment Loss from Operations [Line Items]  
Research and development personnel-related expense (excluding stock-based compensation) $ 75,060 [1]
General and administrative personnel-related expense (excluding stock-based compensation) 13,063 [2]
Total operating expenses 88,123
Loss from operations (88,123)
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) 3,959
General and administrative personnel-related expense (excluding stock-based compensation) 5,054
Research and development stock-based compensation [Member]  
Schedule of Segment Loss from Operations [Line Items]  
Research and development personnel-related expense (excluding stock-based compensation) 11,992
General and administrative stock-based compensation [Member]  
Schedule of Segment Loss from Operations [Line Items]  
Research and development personnel-related expense (excluding stock-based compensation) 2,927
External [Member]  
Schedule of Segment Loss from Operations [Line Items]  
Research and development personnel-related expense (excluding stock-based compensation) 57,680
Other [Member]  
Schedule of Segment Loss from Operations [Line Items]  
Research and development personnel-related expense (excluding stock-based compensation) 1,429
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) $ 5,082
[1] Includes related party amount of $42,640 for the period from February 6, 2024 (inception) to December 31, 2024
[2] Includes related party amount of $1,364 for the period from February 6, 2024 (inception) to December 31, 2024