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Operating expenses - Summary of Payroll Costs (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]      
Wages and salaries € (11,391) € (11,141) € (11,876)
Payroll taxes (4,308) (3,953) (4,913)
Share-based payments (3,201) (2,924) (4,320)
Retirement benefit obligations (84) (76) (76)
Total payroll costs € (18,984) € (18,094) € (21,185)
Average headcount | employee 96 97 112
End-of-period headcount | employee 100 90 110