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Operating expenses - Research and Development, Additional Information (Details)
€ in Thousands
12 Months Ended
Dec. 31, 2021
EUR (€)
employee
Dec. 31, 2020
EUR (€)
employee
Dec. 31, 2019
EUR (€)
employee
Disclosure Of Operating Expenses [Line Items]      
Decrease in employee benefit expense | € € 774    
Decrease in employee benefit expense, percentage 8.00%    
End-of-period headcount | employee 100 90 110
Increase (decrease) in number of employees | employee 10    
Share-based payments | € € 3,201 € 2,924 € 4,320
R&D      
Disclosure Of Operating Expenses [Line Items]      
Increase in purchases, sub-contracting and other expenses | € € 6,900    
Increase in purchases, sub-contracting and other expenses, percentage 54.00%    
End-of-period headcount | employee 75 66 81
Increase (decrease) in number of employees | employee 9 (15) 2
Share-based payments | € € 677 € 629 € 902