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Financial Risk Management Objectives and Policies - Summary of Currency Risk Exposure (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
[2]
Dec. 31, 2017
Disclosure Of Currency Risk Exposure [Line Items]        
Cash and cash equivalents € 207,530 € 103,353 [1] € 39,367 € 8,415
Financial assets 28,198 € 18,690    
Currency risk [member] | Immatics GmbH [Member]        
Disclosure Of Currency Risk Exposure [Line Items]        
Cash and cash equivalents 52,015      
Financial assets 24,448      
Total assets exposed to the risk 76,463      
Immatics N.V. [Member] | Currency risk [member]        
Disclosure Of Currency Risk Exposure [Line Items]        
Cash and cash equivalents 42,528      
Financial assets 0      
Total assets exposed to the risk € 42,528      
[1] See Note 2 for details regarding the change in presentation of Other financial assets
[2] See Note 2 for details regarding the revision as a result of a correction in classification of Other financial assets