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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 15, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-36201    
Entity Registrant Name Immunic, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 56-2358443    
Entity Address, Address Line One 1200 Avenue of the Americas,    
Entity Address, Address Line Two Suite 200    
Entity Address, City or Town New York,    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10036    
City Area Code 332    
Local Phone Number 255-9818    
Title of 12(b) Security Common Stock, $0.0001 par value    
Trading Symbol IMUX    
Security Exchange Name 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 false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 109.5
Entity Common Stock, Shares Outstanding   89,929,016  
Documents Incorporated by Reference Certain portions of the registrant’s definitive Proxy Statement for its 2023 Annual Meeting of Stockholders are incorporated by reference into Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K.    
Entity Central Index Key 0001280776    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false