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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)