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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 03, 2022
Jun. 30, 2021
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2021    
Entity File Number 001-40675    
Entity Registrant Name Immuneering Corp    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 26-1976972    
Entity Address, Address Line One 245 Main St    
Entity Address, Address Line Two Second Floor    
Entity Address, City or Town Cambridge    
Entity Address State Or Province MA    
Entity Address, Postal Zip Code 02142    
City Area Code 617    
Local Phone Number 500-8080    
Title of 12(b) Security Class A common Stock, par value $0.001 per share    
Trading Symbol IMRX    
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 true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float   $ 136,900,000 $ 0
Documents Incorporated by Reference

Portions of the registrant’s Definitive Proxy Statement relating to the registrant’s 2022 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission within 120 days of the end of the registrant’s fiscal year ended December 31, 2021 are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein.

    
Auditor Name RSM US LLP    
Auditor Firm ID 49    
Auditor Location Boston, Massachusetts    
Entity Central Index Key 0001790340    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Class A Common Stock      
Entity Common Stock, Shares Outstanding   26,377,299  
Class B Common Stock      
Entity Common Stock, Shares Outstanding   0