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Document and Entity Information
Apr. 10, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 10, 2021
Entity Registrant Name SYNLOGIC, INC.
Entity Central Index Key 0001527599
Entity Incorporation, State or Country Code DE
Entity File Number 001-37566
Entity Tax Identification Number 26-1824804
Entity Address, Address Line One 301 Binney St.
Entity Address, Address Line Two Suite 402
Entity Address, City or Town Cambridge
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02142
City Area Code 617
Local Phone Number 401-9975
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol SYBX
Security Exchange Name NASDAQ
Entity Emerging Growth Company false