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Operating Expense (Tables) | 12 Months Ended
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Dec. 31, 2021
Operating Expense [Abstract] |
Summary of Operating Expenses and Other Operating Income |
| Operating expenses and other operating income (expenses) |  | Year ended |  | Of which :
|  |  | 2019/12/31 |  | Raw |  | Contracted |  | Employee |  | Other |  | Depreciation, |  | Gain /
|  |  |  |  | materials |  | research and |  | expenses |  | expenses |  | amortization |  | (loss) on
|  |  |  |  | and |  | development |  |  |  | (maintenance, |  | and |  | disposal of
|  |  |  |  | consumables |  | activities |  |  |  | fees, travel, |  | impairment |  | property,
|  |  |  |  | used |  | conducted by |  |  |  | taxes…) |  | charges |  | plant and
| (in € thousands) |  |  |  |  |  | third parties |  |  |  |  |  |  |  | equipment
| Research and development expenses |  | (66,170) |  |  | (2,017) |  |  | (41,509) |  |  | (11,740) |  |  | (6,188) |  |  | (4,716) |  |  | — |
| General and administrative expenses |  | (17,265) |  |  | (177) |  |  | (59) |  |  | (7,598) |  |  | (8,972) |  |  | (458) |  |  | — |
| Marketing and market access expenses |  | (13,708) |  |  | (8) |  |  | — |  |  | (1,645) |  |  | (11,979) |  |  | (76) |  |  | — |
| Reorganization and restructuring expenses |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
| Other operating income (expenses) |  | (1,649) |  |  | — |  |  | — |  |  | — |  |  | (1,668) |  |  | — |  |  | 19 |
| TOTAL |  | (98,793) |  |  | (2,202) |  |  | (41,568) |  |  | (20,984) |  |  | (28,807) |  |  | (5,251) |  |  | 19 |
| (*) : including reversals |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Operating expenses and other operating income (expenses) |  | Year ended |  | Of which :
|  |  | 2020/12/31 |  | Raw |  | Contracted |  | Employee |  | Other |  | Depreciation, |  | Gain /
|  |  |  |  | materials |  | research and |  | expenses |  | expenses |  | amortization |  | (loss) on
|  |  |  |  | and |  | development |  |  |  | (maintenance, |  | and |  | disposal of
|  |  |  |  | consumables |  | activities |  |  |  | fees, travel, |  | impairment |  | property,
|  |  |  |  | used |  | conducted by |  |  |  | taxes…) |  | charges |  | plant and
| (in € thousands) |  |  |  |  |  | third parties |  |  |  |  |  |  |  | equipment
| Research and development expenses |  | (59,097) |  |  | (1,876) |  |  | (39,216) |  |  | (11,554) |  |  | (5,465) |  |  | (985) |  |  | — |
| General and administrative expenses |  | (14,270) |  |  | (202) |  |  | (92) |  |  | (6,936) |  |  | (6,545) |  |  | (495) |  |  | — |
| Marketing and market access expenses |  | (11,216) |  |  | (7) |  |  | (2) |  |  | (1,298) |  |  | (9,818) |  |  | (90) |  |  | — |
| Reorganization and restructuring expenses |  | (5,308) |  |  | — |  |  | — |  |  | 8 |  |  | (2,141) |  |  | (3,175) |  |  | — |
| Other operating income (expenses) |  | (764) |  |  | — |  |  | — |  |  | — |  |  | (684) |  |  | — |  |  | (80) |
| TOTAL |  | (90,655) |  |  | (2,085) |  |  | (39,310) |  |  | (19,779) |  |  | (24,655) |  |  | (4,746) |  |  | (80) |
| (*) : including reversals |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Operating expenses and other operating income (expenses) |  | Year ended |  | Of which :
|  |  | 2021/12/31 |  | Raw |  | Contracted |  | Employee |  | Other |  | Depreciation, |  | Gain /
|  |  |  |  | materials |  | research and |  | expenses |  | expenses |  | amortization |  | (loss) on
|  |  |  |  | and |  | development |  |  |  | (maintenance, |  | and |  | disposal of
|  |  |  |  | consumables |  | activities |  |  |  | fees, travel, |  | impairment |  | property,
|  |  |  |  | used |  | conducted by |  |  |  | taxes…) |  | charges |  | plant and
| (in € thousands) |  |  |  |  |  | third parties |  |  |  |  |  |  |  | equipment
| Research and development expenses |  | (35,166) |  |  | (1,305) |  |  | (18,808) |  |  | (8,192) |  |  | (4,593) |  |  | (2,247) |  |  | (19) |
| General and administrative expenses |  | (16,153) |  |  | (161) |  |  | (85) |  |  | (7,379) |  |  | (8,003) |  |  | (541) |  |  | 15 |
| Marketing and market access expenses |  | (1,539) |  |  | (1) |  |  | (1) |  |  | (783) |  |  | (741) |  |  | (13) |  |  | — |
| Reorganization and restructuring expenses |  | (142) |  |  | (5) |  |  | — |  |  | — |  |  | (2,343) |  |  | 2,206 |  |  | — |
| Other operating income (expenses) |  | (763) |  |  | — |  |  | — |  |  | — |  |  | (338) |  |  | 4 |  |  | (429) |
| TOTAL |  | (53,763) |  |  | (1,472) |  |  | (18,895) |  |  | (16,354) |  |  | (16,019) |  |  | (591) |  |  | (433) |
| (*) : including reversals |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Employee Expenses and Number of Employees | Employee expenses and number of employees were as follows:
| Employee expenses |  | Year ended
| (in € thousands) |  | 2019/12/31 |  | 2020/12/31 |  | 2021/12/31
| Wages and salaries |  | (14,018) |  |  | (13,570) |  |  | (10,328) |
| Social security costs |  | (5,171) |  |  | (5,047) |  |  | (4,775) |
| Changes in pension provision |  | (138) |  |  | 74 |  |  | (154) |
| Employee profit-sharing |  | — |  |  | — |  |  | (628) |
| Share-based compensation |  | (1,657) |  |  | (1,236) |  |  | (470) |
| TOTAL |  | (20,984) |  |  | (19,779) |  |  | (16,354) |
| Number of employees at year-end - detail |  | Year ended
|  |  | 2019/12/31 |  | 2020/12/31 |  | 2021/12/31
| Average number of employees |  | 175 |  | 193 |  | 122
| Number of employees |  |  |  |  |  |
| Research and development |  | 108 |  | 66 |  | 55
| Services related to research and development |  | 19 |  | 16 |  | 18
| Administration and management |  | 60 |  | 43 |  | 47
| Marketing and commercial |  | 7 |  | 5 |  | 2
| TOTAL |  | 194 |  |  | 130 |  |  | 122 |
| Number of employees |  |  |  |  |  |
| Senior staff |  | 144 |  | 105 |  | 97
| Staff |  | 45 |  | 23 |  | 21
| Others (apprentices) |  | 5 |  | 2 |  | 4
| TOTAL |  | 194 |  | 130 |  | 122
| Number of employees |  |  |  |  |  |
| Male |  | 78 |  | 52 |  | 45
| Female |  | 116 |  | 78 |  | 77
| TOTAL |  | 194 |  | 130 |  | 122

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