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Document and Entity Information
Jun. 16, 2025
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001755237
Document Type 8-K
Document Period End Date Jun. 16, 2025
Entity Registrant Name CYCLERION THERAPEUTICS, INC.
Entity Incorporation State Country Code MA
Entity File Number 001-38787
Entity Tax Identification Number 83-1895370
Entity Address, Address Line One 245 First Street
Entity Address, Address Line Two 18th Floor
Entity Address, City or Town Cambridge
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02142
City Area Code (857)
Local Phone Number 327-8778
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, no par value
Trading Symbol CYCN
Security Exchange Name NASDAQ
Entity Emerging Growth Company false