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Operating expenses (Other operating income (expenses) excluded) - Personnel costs and headcount (Details) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 EUR (€) employee | Dec. 31, 2019 EUR (€) employee | Dec. 31, 2018 EUR (€) employee
Disclosure of attribution of expenses by nature to their function [Line Items] |  |  |
Number of employees | employee | 94 | 88 | 113
Wages, salaries and similar costs | € (6,442) | € (6,577) | € (6,613)
Payroll taxes | (3,098) | (2,841) | (2,560)
CICE tax credit |  |  | 124
Provisions for retirement benefit obligations | (202) | (156) | (190)
Share-based compensation expense | (938) | (1,407) | (833)
Total employee benefits expense | (10,680) | (10,981) | (10,072)
Research and development expense |  |  |
Disclosure of attribution of expenses by nature to their function [Line Items] |  |  |
Wages, salaries and similar costs | (4,590) | (4,908) | (5,085)
Payroll taxes | (2,180) | (2,206) | (1,981)
CICE tax credit |  |  | 103
Provisions for retirement benefit obligations | (141) | (95) | (145)
Share-based compensation expense | (607) | (868) | (516)
Total employee benefits expense | (7,518) | (8,076) | (7,625)
Marketing - business development expenses |  |  |
Disclosure of attribution of expenses by nature to their function [Line Items] |  |  |
Wages, salaries and similar costs | (183) | (178) | (178)
Payroll taxes | 8 | (1) | (3)
Share-based compensation expense | (22) | (22) | (1)
Total employee benefits expense | (197) | (202) | (182)
General and administrative expense |  |  |
Disclosure of attribution of expenses by nature to their function [Line Items] |  |  |
Wages, salaries and similar costs | (1,669) | (1,491) | (1,349)
Payroll taxes | (926) | (634) | (576)
CICE tax credit |  |  | 20
Provisions for retirement benefit obligations | (60) | (61) | (45)
Share-based compensation expense | (309) | (517) | (316)
Total employee benefits expense | € (2,964) | € (2,703) | € (2,266)

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