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Operating expenses - Selling, General and Administrative, Additional Information (Details)
€ in Thousands
 12 Months Ended
Dec. 31, 2021
EUR (€)
employee
factor
Dec. 31, 2020
EUR (€)
employee
Dec. 31, 2019
EUR (€)
employee
Disclosure Of Operating Expenses [Line Items]      
Number of impacts | factor 2    
Short-term employee benefits expense € 15,700 € 15,100 € 16,800
Increase in employee benefit expense € (774)    
Increase in employee benefit expense, percentage (8.00%)    
End-of-period headcount | employee 100 90 110
Increase in number of employees | employee 10    
Share-based payments € 3,201 € 2,924 € 4,320
Selling, general and administrative expense      
Disclosure Of Operating Expenses [Line Items]      
Increase in rent, fees, and other expenses € 3,156    
Increase in rent, fees, and other expenses, percentage 49.00%    
Increase in employee benefit expense € 1,600    
Increase in employee benefit expense, percentage 21.00%    
End-of-period headcount | employee 25 24 29
Increase in number of employees | employee     6
Share-based payments € 2,500 € 2,300 € 3,400