XML 7 R1.htm IDEA: XBRL DOCUMENT v3.25.3
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2025
Nov. 06, 2025
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q3  
Entity Registrant Name SYNLOGIC, INC.  
Entity Central Index Key 0001527599  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Shell Company false  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   11,698,919
Entity Address, State or Province MA  
Entity File Number 001-37566  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 26-1824804  
Entity Address, Address Line One PO Box  
Entity Address, Address Line Two 30  
Entity Address, City or Town Winchester  
Entity Address, Postal Zip Code 01890  
City Area Code 617  
Local Phone Number 659-2802  
Entity Interactive Data Current Yes  
Document Quarterly Report true  
Document Transition Report false  
Common Stock [Member]    
Document Information [Line Items]    
Trading Symbol SYBX  
Security Exchange Name NASDAQ  
Title of 12(b) Security Common Stock, par value $0.001 per share