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Operating expenses - Research and Development, Additional Information (Details)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
EUR (€)
employee
Dec. 31, 2023
EUR (€)
employee
Dec. 31, 2022
EUR (€)
employee
Disclosure Of Operating Expenses [Line Items]      
Increase/ decrease in employee benefit expense € (1,600) € 100  
Increase (decrease) in employee benefit expense, percentage (15.10%) 1.40%  
End of period headcount) (employee) | employee 108 102 102
Share-based payments € 4,298 € 3,222 € 3,174
R&D      
Disclosure Of Operating Expenses [Line Items]      
Increase in purchases, sub-contracting and other expenses € 700 € 6,000  
Increase in purchases, sub-contracting and other expenses, percentage 2.50% 29.20%  
End of period headcount) (employee) | employee 77 76 74
Increase (decrease) in number of employees | employee 1 2 1
Share-based payments € 500 € 400 € 300