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v3.26.3
Document and Entity Information
Oct. 22, 2026
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001609809
Document Type 8-K
Document Period End Date Oct. 22, 2026
Entity Registrant Name SERES THERAPEUTICS, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-37465
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common stock, par value $0.001 per share
Trading Symbol MCRB
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
X
- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details
Name: dei_AmendmentFlag
Namespace Prefix: dei_
Data Type: xbrli:booleanItemType
Balance Type: na
Period Type: duration
X
- Definition

Area code of city

+ References

No definition available.

+ Details
Name: dei_CityAreaCode
Namespace Prefix: dei_
Data Type: xbrli:normalizedStringItemType
Balance Type: na
Period Type: duration
X
- Definition

Cover page.

+ References

No definition available.

+ Details
Name: dei_CoverAbstract
Namespace Prefix: dei_
Data Type: xbrli:stringItemType
Balance Type: na
Period Type: duration
X
- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details
Name: dei_DocumentPeriodEndDate
Namespace Prefix: dei_
Data Type: xbrli:dateItemType
Balance Type: na
Period Type: duration
X
- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details
Name: dei_DocumentType
Namespace Prefix: dei_
Data Type: dei:submissionTypeItemType
Balance Type: na
Period Type: duration
X
- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details
Name: dei_EntityAddressAddressLine1
Namespace Prefix: dei_
Data Type: xbrli:normalizedStringItemType
Balance Type: na
Period Type: duration
X
- Definition

Name of the City or Town

+ References

No definition available.

+ Details
Name: dei_EntityAddressCityOrTown
Namespace Prefix: dei_
Data Type: xbrli:normalizedStringItemType
Balance Type: na
Period Type: duration
X
- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details
Name: dei_EntityAddressPostalZipCode
Namespace Prefix: dei_
Data Type: xbrli:normalizedStringItemType
Balance Type: na
Period Type: duration
X
- Definition

Name of the state or province.

+ References

No definition available.

+ Details
Name: dei_EntityAddressStateOrProvince
Namespace Prefix: dei_
Data Type: dei:stateOrProvinceItemType
Balance Type: na
Period Type: duration
X
- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2

+ Details
Name: dei_EntityCentralIndexKey
Namespace Prefix: dei_
Data Type: dei:centralIndexKeyItemType
Balance Type: na
Period Type: duration
X
- Definition

Indicate if registrant meets the emerging growth company criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2

+ Details
Name: dei_EntityEmergingGrowthCompany
Namespace Prefix: dei_
Data Type: xbrli:booleanItemType
Balance Type: na
Period Type: duration
X
- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details
Name: dei_EntityFileNumber
Namespace Prefix: dei_
Data Type: dei:fileNumberItemType
Balance Type: na
Period Type: duration
X
- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details
Name: dei_EntityIncorporationStateCountryCode
Namespace Prefix: dei_
Data Type: dei:edgarStateCountryItemType
Balance Type: na
Period Type: duration
X
- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2

+ Details
Name: dei_EntityRegistrantName
Namespace Prefix: dei_
Data Type: xbrli:normalizedStringItemType
Balance Type: na
Period Type: duration
X
- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2

+ Details
Name: dei_EntityTaxIdentificationNumber
Namespace Prefix: dei_
Data Type: dei:employerIdItemType
Balance Type: na
Period Type: duration
X
- Definition

Local phone number for entity.

+ References

No definition available.

+ Details
Name: dei_LocalPhoneNumber
Namespace Prefix: dei_
Data Type: xbrli:normalizedStringItemType
Balance Type: na
Period Type: duration
X
- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 13e
-Subsection 4c

+ Details
Name: dei_PreCommencementIssuerTenderOffer
Namespace Prefix: dei_
Data Type: xbrli:booleanItemType
Balance Type: na
Period Type: duration
X
- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 14d
-Subsection 2b

+ Details
Name: dei_PreCommencementTenderOffer
Namespace Prefix: dei_
Data Type: xbrli:booleanItemType
Balance Type: na
Period Type: duration
X
- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b

+ Details
Name: dei_Security12bTitle
Namespace Prefix: dei_
Data Type: dei:securityTitleItemType
Balance Type: na
Period Type: duration
X
- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection d1-1

+ Details
Name: dei_SecurityExchangeName
Namespace Prefix: dei_
Data Type: dei:edgarExchangeCodeItemType
Balance Type: na
Period Type: duration
X
- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 14a
-Subsection 12

+ Details
Name: dei_SolicitingMaterial
Namespace Prefix: dei_
Data Type: xbrli:booleanItemType
Balance Type: na
Period Type: duration
X
- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details
Name: dei_TradingSymbol
Namespace Prefix: dei_
Data Type: dei:tradingSymbolItemType
Balance Type: na
Period Type: duration
X
- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Securities Act
-Number 230
-Section 425

+ Details
Name: dei_WrittenCommunications
Namespace Prefix: dei_
Data Type: xbrli:booleanItemType
Balance Type: na
Period Type: duration