| Document and Entity Information | Aug. 05, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 05, 2024 |
| Entity File Number | 001-37465 |
| Entity Registrant Name | Seres Therapeutics, Inc. |
| Entity Central Index Key | 0001609809 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 27-4326290 |
| Entity Address, Address Line One | 101 Cambridgepark Drive |
| Entity Address, City or Town | Cambridge |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 02140 |
| City Area Code | 617 |
| Local Phone Number | 945-9626 |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | MCRB |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Written Communications | false |
| Soliciting Material | true |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
