Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Cover [Abstract]
Document Type	10-Q/A
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		14,968,340
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Description	This Amendment No. 1 on Form 10-Q/A (“Form 10-Q/A”) of Immunic, Inc. amends the Quarterly Report on Form 10-Q for the quarter ended June 30, 2020, as originally filed with the Securities and Exchange Commission on August 3, 2020 (the “Original Filing”). As a result of a typographical and clerical error, the Section 302 and 906 Certifications attached as Exhibits 31.1, 31.2, 32.1 and 32.2 to the Original Filing included incorrect dates. This Form 10-Q/A is being filed solely to include revised Section 302 and 906 Certifications that reference the correct dates. Because Immunic, Inc. is refiling the Section 302 and 906 Certifications, it is required to refile with this Form 10-Q/A the Original Filing in its entirety as amended by this Form 10-Q/A. Except for the revisions specified in this Explanatory Note, this Form 10-Q/A does not amend the Original Filing in any way and does not modify or otherwise update any disclosures contained in the Original Filing.
Amendment Flag	true
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001280776