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Revenue from collaboration agreements - Additional Information (Detail) - EUR (€)
€ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure Of Revenue From Contract With Customers [Line Items]        
Amortization of contract costs capitalized € 200 € 100 € 300 € 100
Revenue from collaboration agreement of right to use license 17,215 5,189 120,123 12,592
BMS Collaboration Agreement [Member]        
Disclosure Of Revenue From Contract With Customers [Line Items]        
Revenue from collaboration agreement of right to use license 12,107 € 1,297 110,532 € 4,590
Revenue from collaboration agreements     19,200  
BMS Collaboration Agreement [Member] | IMA401 [Member]        
Disclosure Of Revenue From Contract With Customers [Line Items]        
Revenue from collaboration agreement of right to use license     91,300  
Collaboration Agreement [Member]        
Disclosure Of Revenue From Contract With Customers [Line Items]        
Milestone or royalty payment receivable € 0   € 0