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Segment Disclosures - Schedule of Segment Loss from Operations (Details) - USD ($)
$ in Thousands
11 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Schedule of Segment Loss from Operations [Line Items]    
Research and development personnel-related expense (excluding stock-based compensation) [1] $ 75,060  
General and administrative personnel-related expense (excluding stock-based compensation) [2] 13,063  
Total operating expenses 88,123 $ 88,123
Loss from operations $ (88,123) (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