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Intangible assets - Narrative (Details) - EUR (€)
€ in Thousands
1 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Apr. 01, 2022
Prosynergia          
Disclosure of detailed information about intangible assets [line items]          
Patents         € 6,529
Exclusive licensing contract with the Scripps Research Institute, University of Chicago and Brigham Young University          
Disclosure of detailed information about intangible assets [line items]          
Collaboration agreements, development milestone payment, IND approval € 45        
Exclusive licensing agreement with CNRS, University of Montpellier and Institut Curie          
Disclosure of detailed information about intangible assets [line items]          
Collaboration agreements, development milestone payment, Phase 2 € 40        
Wittycel SAS          
Disclosure of detailed information about intangible assets [line items]          
Intangible assets with indefinite useful life       € 0  
Impairment   € 0 € 0 € 45