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Intangible assets - Disclosure of detailed information about intangible assets (Details) - EUR (€)
€ in Thousands
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets other than goodwill at beginning of period € 416 € 1,556
Acquisitions 0 0
Additional considerations 0 2,000
Disposals 0 0
Amortizations (297) (2,651)
Transfers 0 0
Intangible assets other than goodwill at end of period 119 903
Monalizumab agreement    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Amortizations (294) (651)
Agreement with Orega Biotech    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Amortizations   (2,000)
Purchased licenses    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets other than goodwill at beginning of period 413 1,556
Acquisitions 0 0
Additional considerations 0 2,000
Disposals 0 0
Amortizations (294) (2,651)
Transfers 0 0
Intangible assets other than goodwill at end of period 119 903
Other intangible assets    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets other than goodwill at beginning of period 3 0
Acquisitions 0 0
Additional considerations 0 0
Disposals 0 0
Amortizations (3) 0
Transfers 0 0
Intangible assets other than goodwill at end of period 0 0
In progress    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Intangible assets other than goodwill at beginning of period 0 0
Acquisitions 0 0
Additional considerations 0 0
Disposals 0 0
Amortizations 0 0
Transfers 0 0
Intangible assets other than goodwill at end of period € 0 € 0