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STATEMENTS OF OPERATIONS - PREDECESSOR MILLROSE BUSINESS [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Operating Expenses:    
Salaries, general and administrative expenses $ (246,221) $ (209,792)
Loss before income taxes (246,221) (209,792)
Loss $ (246,221) $ (209,792)