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Financial liabilities - Disclosure of changes in derivative instruments (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | € 2,579 | € 566 | € 9,932
Issuance | 2,158 | 3,585 |
Increase in fair value | 1,462 | 3,046 | 0
Decrease in fair value | (1,413) | (1,006) | (9,366)
Repurchases |  | (2,591) |
Exercises |  | (1,021) |
Derivative financial liabilities at end of period | 4,786 | 2,579 | 566
Kreos A BSA |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | 0 | 275 | 2,478
Issuance | 0 | 0 |
Increase in fair value | 0 | 986 | 0
Decrease in fair value | 0 | 0 | (2,203)
Repurchases |  | (489) |
Exercises |  | (771) |
Derivative financial liabilities at end of period | 0 | 0 | 275
Kreos B BSA |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | 0 | 149 | 1,525
Issuance | 0 | 0 |
Increase in fair value | 0 | 440 | 0
Decrease in fair value | 0 | 0 | (1,376)
Repurchases |  | (339) |
Exercises |  | (250) |
Derivative financial liabilities at end of period | 0 | 0 | 149
OCEANE conversion option |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | 0 | 142 | 5,929
Issuance | 0 | 0 |
Increase in fair value | 0 | 1,620 | 0
Decrease in fair value | 0 | 0 | (5,787)
Repurchases |  | (1,762) |
Exercises |  | 0 |
Derivative financial liabilities at end of period | 0 | 0 | 142
Kreos/Claret BSA |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | 2,579 | 0 | 0
Issuance | 0 | 3,585 |
Increase in fair value | 0 | 0 | 0
Decrease in fair value | (1,413) | (1,006) | 0
Repurchases |  | 0 |
Exercises |  | 0 |
Derivative financial liabilities at end of period | 1,166 | 2,579 | 0
Kreos/Claret Minimum Return Indemnifications |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | 0 | 0 | 0
Issuance | 2,158 | 0 |
Increase in fair value | 1,462 | 0 | 0
Decrease in fair value | 0 | 0 | 0
Repurchases |  | 0 |
Exercises |  | 0 |
Derivative financial liabilities at end of period | € 3,620 | € 0 | € 0

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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gains resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard -URIDate 2024-03-27 + Details
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