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Net financial income (loss) - Narrative (Details) - EUR (€)
€ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Disclosure of financial instruments by type of interest rate [line items]      
Interest income on cash and cash equivalents € 600 € 1,500  
Interest costs 4,174 3,772  
Net foreign exchange loss 3,624 324  
Short-term bank deposits 24,125   € 44,427
Foreign exchange gains 47 1,888  
USD      
Disclosure of financial instruments by type of interest rate [line items]      
Net foreign exchange loss 3,600    
Short-term bank deposits 3,500 1,100  
Foreign exchange gains   1,600  
USD | HSBC Bank      
Disclosure of financial instruments by type of interest rate [line items]      
Short-term bank deposits   500  
EIB Loan      
Disclosure of financial instruments by type of interest rate [line items]      
Interest costs 4,100    
Impact of accretion and discounting 1,000 2,700  
Increase (decrease) related to adjustments for income forecast projections 1,400 13,500  
Adjustment to debt financing related to estimated debt outflows 2,400 10,800  
EIB Loan | Fixed interest rate      
Disclosure of financial instruments by type of interest rate [line items]      
Interest expense € 4,100    
EIB Loan | Variable interest rate      
Disclosure of financial instruments by type of interest rate [line items]      
Interest expense   € 3,700