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Operating expenses - Additional information (Details)
€ in Thousands
 6 Months Ended
Jun. 30, 2024
EUR (€)
employee
Jun. 30, 2023
EUR (€)
employee
Disclosure of operating expenses [Line Items]    
Personnel expenses other than share-based compensation € 11,002 € 11,652
Number of employees | employee 168 191
Amortisation, intangible assets other than goodwill € 297 € 2,651
R&D    
Disclosure of operating expenses [Line Items]    
Number of employees | employee 135 151
Administration    
Disclosure of operating expenses [Line Items]    
Number of employees | employee 39 45
Agreement with Orega Biotech    
Disclosure of operating expenses [Line Items]    
Amortisation, intangible assets other than goodwill   € 2,000
Monalizumab agreement    
Disclosure of operating expenses [Line Items]    
Amortisation, intangible assets other than goodwill € 294 € 651