{"cik":1789972,"taxonomy":"us-gaap","tag":"ShareBasedCompensation","label":"Share-based Payment Arrangement, Noncash Expense","description":"Amount of noncash expense for share-based payment arrangement.","entityName":"CULLINAN THERAPEUTICS, INC.","units":{"USD":[{"start":"2020-01-01","end":"2020-12-31","val":14910000,"accn":"0000950170-22-004002","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-17","frame":"CY2020"},{"start":"2021-01-01","end":"2021-03-31","val":3508000,"accn":"0001564590-21-027796","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-14"},{"start":"2021-01-01","end":"2021-03-31","val":3508000,"accn":"0000950170-22-009937","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-16","frame":"CY2021Q1"},{"start":"2021-01-01","end":"2021-06-30","val":7673000,"accn":"0001564590-21-042872","fy":2021,"fp":"Q2","form":"10-Q","filed":"2021-08-10"},{"start":"2021-01-01","end":"2021-06-30","val":7673000,"accn":"0000950170-22-016258","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-10"},{"start":"2021-01-01","end":"2021-09-30","val":12230000,"accn":"0001564590-21-055440","fy":2021,"fp":"Q3","form":"10-Q","filed":"2021-11-09"},{"start":"2021-01-01","end":"2021-09-30","val":12230000,"accn":"0000950170-22-024683","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-14"},{"start":"2021-01-01","end":"2021-12-31","val":24375000,"accn":"0000950170-22-004002","fy":2021,"fp":"FY","form":"10-K","filed":"2022-03-17"},{"start":"2021-01-01","end":"2021-12-31","val":24375000,"accn":"0000950170-23-006839","fy":2022,"fp":"FY","form":"10-K","filed":"2023-03-09","frame":"CY2021"},{"start":"2022-01-01","end":"2022-03-31","val":6565000,"accn":"0000950170-22-009937","fy":2022,"fp":"Q1","form":"10-Q","filed":"2022-05-16"},{"start":"2022-01-01","end":"2022-03-31","val":6565000,"accn":"0000950170-23-021253","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-11","frame":"CY2022Q1"},{"start":"2022-01-01","end":"2022-06-30","val":15173000,"accn":"0000950170-22-016258","fy":2022,"fp":"Q2","form":"10-Q","filed":"2022-08-10"},{"start":"2022-01-01","end":"2022-06-30","val":15173000,"accn":"0000950170-23-040964","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-10"},{"start":"2022-01-01","end":"2022-09-30","val":20444000,"accn":"0000950170-22-024683","fy":2022,"fp":"Q3","form":"10-Q","filed":"2022-11-14"},{"start":"2022-01-01","end":"2022-09-30","val":20444000,"accn":"0000950170-23-060679","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-08"},{"start":"2022-01-01","end":"2022-12-31","val":27957000,"accn":"0000950170-23-006839","fy":2022,"fp":"FY","form":"10-K","filed":"2023-03-09"},{"start":"2022-01-01","end":"2022-12-31","val":27957000,"accn":"0000950170-24-031143","fy":2023,"fp":"FY","form":"10-K","filed":"2024-03-14","frame":"CY2022"},{"start":"2023-01-01","end":"2023-03-31","val":7259000,"accn":"0000950170-23-021253","fy":2023,"fp":"Q1","form":"10-Q","filed":"2023-05-11"},{"start":"2023-01-01","end":"2023-03-31","val":7259000,"accn":"0000950170-24-060535","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-15","frame":"CY2023Q1"},{"start":"2023-01-01","end":"2023-06-30","val":15179000,"accn":"0000950170-23-040964","fy":2023,"fp":"Q2","form":"10-Q","filed":"2023-08-10"},{"start":"2023-01-01","end":"2023-06-30","val":15179000,"accn":"0000950170-24-093320","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-08"},{"start":"2023-01-01","end":"2023-09-30","val":22919000,"accn":"0000950170-23-060679","fy":2023,"fp":"Q3","form":"10-Q","filed":"2023-11-08"},{"start":"2023-01-01","end":"2023-09-30","val":22919000,"accn":"0000950170-24-122795","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-07"},{"start":"2023-01-01","end":"2023-12-31","val":30438000,"accn":"0000950170-24-031143","fy":2023,"fp":"FY","form":"10-K","filed":"2024-03-14"},{"start":"2023-01-01","end":"2023-12-31","val":30438000,"accn":"0000950170-25-028346","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-27","frame":"CY2023"},{"start":"2024-01-01","end":"2024-03-31","val":8227000,"accn":"0000950170-24-060535","fy":2024,"fp":"Q1","form":"10-Q","filed":"2024-05-15"},{"start":"2024-01-01","end":"2024-03-31","val":8227000,"accn":"0000950170-25-066384","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-08","frame":"CY2024Q1"},{"start":"2024-01-01","end":"2024-06-30","val":18760000,"accn":"0000950170-24-093320","fy":2024,"fp":"Q2","form":"10-Q","filed":"2024-08-08"},{"start":"2024-01-01","end":"2024-06-30","val":18760000,"accn":"0000950170-25-104551","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-07"},{"start":"2024-01-01","end":"2024-09-30","val":28190000,"accn":"0000950170-24-122795","fy":2024,"fp":"Q3","form":"10-Q","filed":"2024-11-07"},{"start":"2024-01-01","end":"2024-09-30","val":28190000,"accn":"0001193125-25-268066","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-06"},{"start":"2024-01-01","end":"2024-12-31","val":37824000,"accn":"0000950170-25-028346","fy":2024,"fp":"FY","form":"10-K","filed":"2025-02-27"},{"start":"2024-01-01","end":"2024-12-31","val":37824000,"accn":"0001193125-26-099362","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-10","frame":"CY2024"},{"start":"2025-01-01","end":"2025-03-31","val":9374000,"accn":"0000950170-25-066384","fy":2025,"fp":"Q1","form":"10-Q","filed":"2025-05-08"},{"start":"2025-01-01","end":"2025-03-31","val":9374000,"accn":"0001193125-26-210304","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-07","frame":"CY2025Q1"},{"start":"2025-01-01","end":"2025-06-30","val":19261000,"accn":"0000950170-25-104551","fy":2025,"fp":"Q2","form":"10-Q","filed":"2025-08-07"},{"start":"2025-01-01","end":"2025-09-30","val":28728000,"accn":"0001193125-25-268066","fy":2025,"fp":"Q3","form":"10-Q","filed":"2025-11-06"},{"start":"2025-01-01","end":"2025-12-31","val":36040000,"accn":"0001193125-26-099362","fy":2025,"fp":"FY","form":"10-K","filed":"2026-03-10","frame":"CY2025"},{"start":"2026-01-01","end":"2026-03-31","val":7616000,"accn":"0001193125-26-210304","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-07","frame":"CY2026Q1"}]}}