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Document and Entity Information
Aug. 07, 2023
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001865494
Document Type 8-K
Document Period End Date Aug. 07, 2023
Entity Registrant Name IO Biotech, Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-41008
Entity Tax Identification Number 87-0909276
Entity Address, Address Line One Ole Maaløes Vej 3
Entity Address, Postal Zip Code DK-2200
Entity Address, City or Town Copenhagen N
Entity Address, Country DK
City Area Code +45
Local Phone Number 7070 2980
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 IOBT
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Entity Ex Transition Period false