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Financial liabilities - Financial liabilities - Disclosure of the main data and assumptions, OCEANE convertible loan notes (Details) (Details) - Oceane € in Thousands | Aug. 24, 2023 EUR (€) € / shares | Dec. 31, 2022 EUR (€) € / shares | Jul. 30, 2021 € / shares
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Disclosure of financial liabilities [line items] |  |  |
Fair value of convertible notes | € | € 1,762 | € 142 |
Risk-free rate | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 0.0322 | 0.0305 |
Credit spread | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 0.1398 | 0.1475 | 0.1400
Ordinary share price (in euro per share) | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | € / shares | 16.74 | 6.18 | 31.50
Volatility | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 0.37 | 0.4401 | 0.53
Dividend | Monte Carlo model |  |  |
Disclosure of financial liabilities [line items] |  |  |
Significant unobservable input, liabilities | 0 | 0 |

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- Definition The value of significant unobservable input used in the measurement of the fair value of liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_d&doctype=Standard -URIDate 2024-03-27 + Details
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