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Related-party transactions (Details) - EUR (€)
€ in Thousands
May 25, 2023
Dec. 31, 2023
Dec. 15, 2023
Related-party transactions      
Percentage of severance payment capped on salary 200.00%    
Payables for severance costs   € 0  
Pierre Broqua      
Related-party transactions      
Amount payable to related parties for transfer of patent intellectual property rights, conditional amount   50  
Amount payable to related parties for transfer of patent intellectual property rights, unconditional amount   € 50  
Pierre Broqua | Maximum      
Related-party transactions      
Amount payable to related parties for transfer of patent intellectual property rights     € 100