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Operating Income (Tables) | 12 Months Ended
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Dec. 31, 2021
Disclosure Of Other Income [Abstract] |
Schedule of Other Income | Other income consisted of the following:
| Other income |  | Year ended
| (in € thousands) |  | 2019/12/31 |  | 2020/12/31 |  | 2021/12/31
| CIR tax credit |  | 8,125 |  |  | 6,020 |  |  | 5,282 |
| Other operating income |  | 1,992 |  |  | 968 |  |  | 223 |
| Government grants and subsidies |  | 5 |  |  | 5 |  |  | 5 |
| TOTAL |  | 10,122 |  |  | 6,993 |  |  | 5,510 |

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