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Share capital - Warrant Plans (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 16, 2014 shares € / shares | Apr. 10, 2013 € / shares | Dec. 31, 2024 shares € / shares | Dec. 31, 2023 shares € / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of shares issued (in shares) |  |  | 0 |
Par value per share (euro per share) | € / shares |  |  | € 0.03 | € 0.03
BSA 2013 |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of shares issued (in shares) |  |  | 0 | 0
Exercise price (in euros per share) | € / shares |  | € 6.37 |  |
Number of awards lapsed or cancelled during the period (in shares) |  |  | 0 | 6,000
BSA 2013 | Supervisory Board |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number of shares issued (in shares) | 14,000 |  |  |
Par value per share (euro per share) | € / shares | € 0.03 |  |  |
Exercise price (in euros per share) | € / shares | € 17.67 |  |  |
Number of awards lapsed or cancelled during the period (in shares) |  |  | 10,000 |

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard -URIDate 2024-03-27 + Details
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