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Operating expenses - Payroll Costs, 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
Short-term employee benefits expense 20,000 19,200 € 17,300
Selling, general and administrative expense      
Disclosure Of Operating Expenses [Line Items]      
Increase/ decrease in employee benefit expense € 200 € 2,100  
Increase (decrease) in employee benefit expense, percentage 1.80% 21.50%  
End of period headcount) (employee) | employee 26 28 28
Share-based payments € 3,800 € 2,900 € 2,800