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Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Apr. 16, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description On February 26, 2026, Immunic, Inc., a Delaware Corporation (the “Company”) filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2025 (the “Original Form 10-K”). The Original Form 10-K omitted portions of Part III, Items 10 (Directors, Executive Officers and Corporate Governance), 11 (Executive Compensation), 12 (Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters), 13 (Certain Relationships and Related Transactions, and Director Independence), and 14 (Principal Accountant Fees and Services) in reliance on General Instruction G(3) to Form 10-K, which provides that such information may be either incorporated by reference from the registrant’s definitive proxy statement or included in an amendment to Form 10-K, in either case filed with the Securities and Exchange Commission (“SEC”) not later than 120 days after the end of the Company’s fiscal year.    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Current Fiscal Year End Date --12-31    
Entity File Number 001-36201    
Entity Registrant Name Immunic, Inc.    
Entity Central Index Key 0001280776    
Entity Tax Identification Number 56-2358443    
Entity Incorporation, State or Country Code DE    
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    
Entity Shell Company false    
Entity Public Float     $ 83,100,000
Entity Common Stock, Shares Outstanding   136,214,825  
Document Financial Statement Error Correction [Flag] false