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Financial Income and Expenses (Tables) | 12 Months Ended
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Dec. 31, 2021
Financial Income And Expenses [Abstract] |
Summary of Financial Income and Expenses |
| Financial income and expenses |  | Year ended
| (in € thousands) |  | 2019/12/31 |  | 2020/12/31 |  | 2021/12/31
| Interest income |  | 2,626 |  | 1,442 |  | 274
| Foreign exchange gain |  | 2,272 |  | 4,983 |  | 8,876
| Financial income occured by renegotiating the convertible bond debt OCEANE |  | 0 |  | 0 |  | 35,578
| Other financial income |  | 324 |  | 119 |  | 52
| TOTAL - Financial income |  | 5,221 |  | 6,544 |  | 44,780
| Financial expenses |  |  |  |  |  |
| Interest expenses |  | (11,289) |  | (11,643) |  | (4,846)
| Interest expenses for leases |  | (148) |  | (134) |  | (109)
| Foreign exchange losses |  | (1,657) |  | (13,508) |  | (2,163)
| Other financial expenses |  | (17) |  | (11) |  | (5)
| TOTAL - Financial expenses |  | (13,110) |  | (25,296) |  | (7,122)
| FINANCIAL GAIN (LOSS) |  | (7,889) |  | (18,752) |  | 37,658

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