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Operating expenses - Payroll Costs, Additional Information (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2021
EUR (€)
employee
Dec. 31, 2020
EUR (€)
employee
Dec. 31, 2019
EUR (€)
employee
Analysis of income and expense [abstract]      
End-of-period headcount | employee 100 90 110
Increase in number of employees | employee 10    
Short-term employee benefits expense | € € 15,700 € 15,100 € 16,800
Share-based payments | € € 3,201 € 2,924 € 4,320