| Document and Entity Information | Jul. 07, 2021 |
| Cover [Abstract] | |
| Amendment Flag | true |
| Entity Central Index Key | 0001840439 |
| Document Type | 8-K/A |
| Document Period End Date | Jul. 7, 2021 |
| Entity Registrant Name | BIOMEA FUSION, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-40335 |
| Entity Tax Identification Number | 82-2520134 |
| Entity Address, Address Line One | 726 Main Street |
| Entity Address, City or Town | Redwood City |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94063 |
| City Area Code | (650) |
| Local Phone Number | 980-9099 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.0001 par value per share |
| Trading Symbol | BMEA |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Amendment Description | This Amendment No. 1 on Form 8-K/A (the “Amendment”) amends the Current Report on Form 8-K of Biomea Fusion, Inc. (the “Company”) filed with the U.S. Securities and Exchange Commission on July 9, 2021 (the “Original Form 8-K”), which incorrectly stated that Franco Valle would be joining the Company as its Chief Executive Officer. Mr. Valle will be joining the Company as its Chief Financial Officer, Principal Financial Officer and Principal Accounting Officer. The original text of the Original Form 8-K has been restated below to reflect such correction. |
