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Financial Risks Management (Tables) | 12 Months Ended
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Dec. 31, 2021
Foreign exchange rates [abstract] |
Summary of Sensitivity of Cash and Cash Equivalents and Expenses to Variation of Ten Percent of the US Dollars Against the Euro | The following table shows the sensitivity of the Group's cash and cash equivalent and expenses in U.S. dollars to a variation of 10% of the U.S. dollar against the euro in 2019, 2020 and 2021. It includes, in particular, the upfront payment in December 2021 by Ipsen for the licensing agreement entered into with GENFIT and its equity purchase in the Company :
| Sensitivity of the Group's cash and cash equivalents to a variation of +/- 10% |  | As of
| of the US dollar against the euro |  |  |  |  |  |
| (in € thousands or in US dollar thousands, as applicable) |  | 2019/12/31 |  | 2020/12/31 |  | 2021/12/31
| Cash and cash equivalents denominated in US dollars |  | 153,438 |  | 111,221 |  | 81,713
| Equivalent in euros, on the basis of the exchange rate described below |  | 136,582 |  | 90,637 |  | 72,146
| Equivalent in euros, in the event of an increase of 10% of US dollar vs euro |  | 151,758 |  | 100,708 |  | 80,163
| Equivalent in euros, in the event of a decrease of 10% of US dollar vs euro |  | 124,166 |  | 82,398 |  | 65,588
| Sensitivity of the Group's expenses to a variation of +/- 10% |  | Year ended
| of the US dollar against the euro |  |  |  |  |  |
| (in € thousands or in US dollar thousands, as applicable) |  | 2019/12/31 |  | 2020/12/31 |  | 2021/12/31
| Expenses denominated in US dollars |  | 40,355 |  | 47,277 |  | 12,566
| Equivalent in euros, on the basis of the exchange rate described below |  | 35,922 |  | 38,528 |  | 11,095
| Equivalent in euros, in the event of an increase of 10% of US dollar vs euro |  | 39,914 |  | 42,808 |  | 12,328
| Equivalent in euros, in the event of a decrease of 10% of US dollar vs euro |  | 32,657 |  | 35,025 |  | 10,086
Summary of Cash, Cash Equivalents and Financial Assets |
| Cash, cash equivalents and financial assets |  | As of
| (in € thousands) |  | 2019/12/31 |  | 2020/12/31 |  | 2021/12/31
| At origin, denominated in EUR |  |  |  |  |  |
| Cash and cash equivalents |  | 139,863 |  |  | 80,391 |  |  | 186,609 |
| Current and non current financial assets |  | 1,614 |  |  | 1,391 |  |  | 4,355 |
| Total |  | 141,477 |  |  | 81,782 |  |  | 190,964 |
| At origin, denominated in USD |  |  |  |  |  |
| Cash and cash equivalents |  | 136,884 |  |  | 90,637 |  |  | 72,147 |
| Current and non current financial assets |  | 113 |  |  | 67 |  |  | 76 |
| Total |  | 136,997 |  |  | 90,704 |  |  | 72,223 |
| Total, in EUR |  |  |  |  |  |
| Cash and cash equivalents |  | 276,748 |  |  | 171,029 |  |  | 258,756 |
| Current and non current financial assets |  | 1,727 |  |  | 1,458 |  |  | 4,431 |
| Total |  | 278,474 |  |  | 172,486 |  |  | 263,187 |

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