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Reorganization and Reverse Stock Split - Number of Shares of Common Stock Exchanged and Issued to Unitholders on Split Adjusted Basis (Details) - Cullinan Oncology, LLC
9 Months Ended
Sep. 30, 2021
shares
Reorganization And Reverse Stock Split [Line Items]  
Number of Management's Shares Issued 242,384,283
Adjusted for the Reverse Stock Split 34,434,262
Series C Preferred Units  
Reorganization And Reverse Stock Split [Line Items]  
Number of Management's Shares Issued 66,599,045
Adjusted for the Reverse Stock Split 9,461,414
Series B Preferred Units  
Reorganization And Reverse Stock Split [Line Items]  
Number of Management's Shares Issued 63,141,016
Adjusted for the Reverse Stock Split 8,970,154
Series A1 Preferred Units  
Reorganization And Reverse Stock Split [Line Items]  
Number of Management's Shares Issued 50,000,000
Adjusted for the Reverse Stock Split 7,103,280
Series Seed Preferred Units  
Reorganization And Reverse Stock Split [Line Items]  
Number of Management's Shares Issued 16,000,000
Adjusted for the Reverse Stock Split 2,273,050
Non-Voting Incentive Units  
Reorganization And Reverse Stock Split [Line Items]  
Number of Management's Shares Issued 11,896,500
Adjusted for the Reverse Stock Split 1,689,949
Common Units  
Reorganization And Reverse Stock Split [Line Items]  
Number of Management's Shares Issued 34,747,722
Adjusted for the Reverse Stock Split 4,936,415