v3.25.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 01, 2025
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Trading Symbol MCRB  
Entity Registrant Name Seres Therapeutics, Inc.  
Entity Central Index Key 0001609809  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
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  
Entity Common Stock Shares Outstanding   8,754,570
Entity Incorporation, State or Country Code DE  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common Stock, par value $0.001  
Security Exchange Name NASDAQ