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Other receivables and other assets - Narrative (Details) - EUR (€)
€ in Thousands
 12 Months Ended 121 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Other Receivables And Other Assets [Line Items]        
Proceeds from research tax credit € 4,493 € 4,476 € 35,600  
Research tax credit ("CIR") 5,774 4,600 4,600 € 4,595
Current prepaid expenses related to CRO 1,577 1,347 1,347 € 1,714
Current advances to suppliers 2,604 3,567 3,567  
Kreos & Claret financing, tranche B        
Disclosure Of Other Receivables And Other Assets [Line Items]        
Reclassification of prepaid expenses to carrying value of debt component € 1,546      
Deferred financing costs        
Disclosure Of Other Receivables And Other Assets [Line Items]        
Borrowings   € 3,152 € 3,152