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Operating Expense - Summary of Employee Expenses and Number of Employees (Details) € in Thousands | 12 Months Ended
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Dec. 31, 2021 EUR (€) employee | Dec. 31, 2020 EUR (€) employee | Dec. 31, 2019 EUR (€) employee
Disclosure Of Operating Expense [Line Items] |  |  |
Wages and salaries | € | € (10,328) | € (13,570) | € (14,018)
Social security costs | € | (4,775) | (5,047) | (5,171)
Changes in pension provision | € | (154) | 74 | (138)
Profit sharing granted to employees | € | (628) | 0 | 0
Share-based compensation | € | (470) | (1,236) | (1,657)
TOTAL | € | € (16,354) | € (19,779) | € (20,984)
Average number of employees | 122 | 193 | 175
Number of employees | 122 | 130 | 194
Research and development |  |  |
Disclosure Of Operating Expense [Line Items] |  |  |
Number of employees | 55 | 66 | 108
Services related to research and development |  |  |
Disclosure Of Operating Expense [Line Items] |  |  |
Number of employees | 18 | 16 | 19
Administration and management |  |  |
Disclosure Of Operating Expense [Line Items] |  |  |
Number of employees | 47 | 43 | 60
Marketing and commercial |  |  |
Disclosure Of Operating Expense [Line Items] |  |  |
Number of employees | 2 | 5 | 7
Senior staff |  |  |
Disclosure Of Operating Expense [Line Items] |  |  |
Number of employees | 97 | 105 | 144
Staff |  |  |
Disclosure Of Operating Expense [Line Items] |  |  |
Number of employees | 21 | 23 | 45
Others (apprentices) |  |  |
Disclosure Of Operating Expense [Line Items] |  |  |
Number of employees | 4 | 2 | 5
Male |  |  |
Disclosure Of Operating Expense [Line Items] |  |  |
Number of employees | 45 | 52 | 78
Female |  |  |
Disclosure Of Operating Expense [Line Items] |  |  |
Number of employees | 77 | 78 | 116

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