XML 53 R1.htm IDEA: XBRL DOCUMENT v3.22.1
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 30, 2022
Feb. 28, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Current Fiscal Year End Date --12-31    
Entity Registrant Name IO BIOTECH, INC.    
Entity Central Index Key 0001865494    
Entity File Number 001-41008    
Entity Tax Identification Number 84-0909276    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One Ole Maaløes Vej 3    
Entity Address, City or Town Copenhagen N    
Entity Address, Country DK    
Entity Address, Postal Zip Code DK-2200    
City Area Code +45    
Local Phone Number 7070 2980    
Title of each class Common stock, par value $0.001 per share    
Trading Symbol(s) IOBT    
Name of each exchange on which registered NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 75.9
Entity Common Stock, Shares Outstanding   28,815,267  
Document Annual Report true    
Document Transition Report false    
Documents incorporated by reference

Portions of the registrant’s proxy statement relating to its 2022 Annual Meeting of Stockholders have been incorporated by reference herein in response to Part III, as specifically set forth in Part III.

    
Auditor Name EY Godkendt Revisionspartnerselskab    
Auditor Firm ID 1757    
Auditor Location Copenhagen, Denmark