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Cover Page
 12 Months Ended
Dec. 31, 2020
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2020
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Entity Registrant Name Immatics N.V.
Entity Central Index Key 0001809196
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Non-accelerated Filer
Entity Common Stock, Shares Outstanding 62,908,617
Entity Voluntary Filers No
Entity Shell Company false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Document Annual Report true
Entity Interactive Data Current Yes
ICFR Auditor Attestation Flag false
Document Accounting Standard International Financial Reporting Standards
Entity Incorporation, State or Country Code P7
Entity File Number 001-39363
Entity Address, Address Line One Paul-Ehrlich-Straße 15
Entity Address, City or Town Tübingen
Entity Address, State or Province TX
Entity Address, Country DE
Entity Address, Postal Zip Code 77030
Document Registration Statement false
Document Shell Company Report false
Document Transition Report false
Business Contact [Member]  
Document Information [Line Items]  
Contact Personnel Name Edward A. Sturchio
Entity Address, Address Line One 2130 W. Holcombe Blvd., Suite 900
Entity Address, City or Town Houston
City Area Code 281
Local Phone Number 810-7545
Common Shares [Member]  
Document Information [Line Items]  
Title of 12(b) Security Ordinary shares, nominal value €0.01 per share
Security Exchange Name NASDAQ
Trading Symbol IMTX
Warrants [Member]  
Document Information [Line Items]  
Title of 12(b) Security Warrants to purchase ordinary shares
Security Exchange Name NASDAQ
Trading Symbol IMTXW