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Income tax - Additional Information (Details)
€ in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred tax asset € 110,900 € 95,000      
Unused tax losses € 105,900 91,800   € 88,300  
Deferred tax rate (percent) 25.80%        
Net loss for the period € (68,132) (39,700)      
Curadigm SAS          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Net loss for the period (4,900)        
Unused Tax Losses          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Unused tax losses       86,200  
France | Unused Tax Losses          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred tax asset € 423,000 € 367,000   € 331,000  
U.S. | Unused Tax Losses          
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]          
Deferred tax asset | $     $ 0.2   $ 3.1