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Compensation of Corporate Officers - Schedule of Director's Fees and Other Compensation Due and Paid to Non Executive Directors (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | € 729,000 | € 650,276 | € 318,613
Amounts paid | 707,521 | 603,408 | 310,123
Jean Francois MOUNEY |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 332,416 | 336,406 | 103,665
Amounts paid | 325,785 | 336,408 | 89,507
Jean Francois MOUNEY | Attendance Fees |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 45,863 | 49,937 | 14,791
Amounts paid | 39,232 | 49,939 | 633
Jean Francois MOUNEY | Other Remuneration |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 286,553 | 286,469 | 88,874
Amounts paid | 286,553 | 286,469 | 88,874
Xavier GUILLE DES BUTTES |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 89,822 | 85,020 | 68,016
Amounts paid | 85,020 | 80,660 | 67,580
Xavier GUILLE DES BUTTES | Attendance Fees |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 89,822 | 85,020 | 68,016
Amounts paid | 85,020 | 80,660 | 67,580
Xavier GUILLE DES BUTTES | Other Remuneration |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 0 | 0 | 0
Amounts paid | 0 | 0 | 0
Frédéric DESDOUITS |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 43,600 | 53,360 | 33,136
Amounts paid | 47,960 | 44,640 | 30,302
Frédéric DESDOUITS | Attendance Fees |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 43,600 | 53,360 | 33,136
Amounts paid | 47,960 | 44,640 | 30,302
Frédéric DESDOUITS | Other Remuneration |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 0 | 0 | 0
Amounts paid | 0 | 0 | 0
BIOTECH AVENIR |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 0 | 0 | 0
Amounts paid | 0 | 0 | 0
BIOTECH AVENIR | Attendance Fees |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 0 | 0 | 0
Amounts paid | 0 | 0 | 0
BIOTECH AVENIR | Other Remuneration |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 0 | 0 | 0
Amounts paid | 0 | 0 | 0
Philippe MOONS |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 16,986 | 45,780 | 36,188
Amounts paid | 25,161 | 41,420 | 41,202
Philippe MOONS | Attendance Fees |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 16,986 | 45,780 | 36,188
Amounts paid | 25,161 | 41,420 | 41,202
Philippe MOONS | Other Remuneration |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 0 | 0 | 0
Amounts paid | 0 | 0 | 0
Anne-Hélène MONSELLATO |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 52,320 | 50,140 | 44,472
Amounts paid | 52,320 | 45,780 | 53,410
Anne-Hélène MONSELLATO | Attendance Fees |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 52,320 | 50,140 | 44,472
Amounts paid | 52,320 | 45,780 | 53,410
Anne-Hélène MONSELLATO | Other Remuneration |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 0 | 0 | 0
Amounts paid | 0 | 0 | 0
Catherine LARUE |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 47,651 | 43,600 | 33,136
Amounts paid | 45,780 | 43,600 | 28,122
Catherine LARUE | Attendance Fees |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 47,651 | 43,600 | 33,136
Amounts paid | 45,780 | 43,600 | 28,122
Catherine LARUE | Other Remuneration |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 0 | 0 | 0
Amounts paid | 0 | 0 | 0
Katherine KALIN |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 43,600 | 15,805 | 0
Amounts paid | 39,240 | 4,360 | 0
Katherine KALIN | Attendance Fees |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 43,600 | 15,805 | 0
Amounts paid | 39,240 | 4,360 | 0
Katherine KALIN | Other Remuneration |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 0 | 0 | 0
Amounts paid | 0 | 0 | 0
Eric BACLET |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 62,881 | 20,165 | 0
Amounts paid | 62,336 | 6,540 | 0
Eric BACLET | Attendance Fees |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 62,881 | 20,165 | 0
Amounts paid | 62,336 | 6,540 | 0
Eric BACLET | Other Remuneration |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 0 | 0 | 0
Amounts paid | 0 | 0 | 0
Jean-François TINE |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 39,724 | 0 | 0
Amounts paid | 23,919 | 0 | 0
Jean-François TINE | Attendance Fees |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 39,724 | 0 | 0
Amounts paid | 23,919 | 0 | 0
Jean-François TINE | Other Remuneration |  |  |
Disclosure Of Compensation Of Corporate Officers [Line Items] |  |  |
Amounts due | 0 | 0 | 0
Amounts paid | € 0 | € 0 | € 0

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