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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings per share [abstract] |
Summary of Earnings (Loss) Per Share | The components of the earnings (loss) per share computation are as follows:
| Earnings per share |  | Year ended
|  |  | 2019/12/31 |  | 2020/12/31 |  | 2021/12/31
| Profit (loss) for the period (in € thousands) |  | (65,144) |  |  | (101,221) |  |  | 67,259 |
| Weighted average number of ordinary shares used to calculate basic earnings (loss) per share |  | 36,987,982 |  |  | 38,858,617 |  |  | 44,739,756 |
| Basic earnings (loss) per share (€/share) |  | (1.76) |  |  | (2.60) |  |  | 1.51 |
| Weighted average number of ordinary shares used to calculate diluted earnings (loss) per share |  | 36,987,982 |  |  | 38,858,617 |  |  | 55,613,634 |
| Diluted earnings (loss) per share (€/share) |  | (1.76) |  |  | (2.60) |  |  | 1.23 |

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- Definition The disclosure of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2021-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2021-en-r&anchor=para_66&doctype=Standard -URIDate 2021-03-24 + Details
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