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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, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | € 4,786 | € 2,579 | € 566
Issuance |  | 2,158 | 3,585
Increase in fair value | 29,935 | 1,462 | 3,046
Decrease in fair value | (3,620) | (1,413) | (1,006)
Repurchases | (4,427) |  | (2,591)
Exercises | (26,674) |  | (1,021)
Derivative financial liabilities at end of period | 0 | 4,786 | 2,579
Kreos A BSA |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | 0 | 0 | 275
Issuance |  | 0 | 0
Increase in fair value | 0 | 0 | 986
Decrease in fair value | 0 | 0 | 0
Repurchases | 0 |  | (489)
Exercises | 0 |  | (771)
Derivative financial liabilities at end of period | 0 | 0 | 0
Kreos B BSA |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | 0 | 0 | 149
Issuance |  | 0 | 0
Increase in fair value | 0 | 0 | 440
Decrease in fair value | 0 | 0 | 0
Repurchases | 0 |  | (339)
Exercises | 0 |  | (250)
Derivative financial liabilities at end of period | 0 | 0 | 0
OCEANE conversion option |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | 0 | 0 | 142
Issuance |  | 0 | 0
Increase in fair value | 0 | 0 | 1,620
Decrease in fair value | 0 | 0 | 0
Repurchases | 0 |  | (1,762)
Exercises | 0 |  | 0
Derivative financial liabilities at end of period | 0 | 0 | 0
Kreos/Claret BSA |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | 1,166 | 2,579 | 0
Issuance |  | 0 | 3,585
Increase in fair value | 29,935 | 0 | 0
Decrease in fair value | 0 | (1,413) | (1,006)
Repurchases | (4,427) |  | 0
Exercises | (26,674) |  | 0
Derivative financial liabilities at end of period | 0 | 1,166 | 2,579
Kreos/Claret Minimal Return Indemnifications |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial liabilities at beginning of period | 3,620 | 0 | 0
Issuance |  | 2,158 | 0
Increase in fair value | 0 | 1,462 | 0
Decrease in fair value | (3,620) | 0 | 0
Repurchases | 0 |  | 0
Exercises | 0 |  | 0
Derivative financial liabilities at end of period | € 0 | € 3,620 | € 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 -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + 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 -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The losses resulting from changes in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard -URIDate 2025-03-27 + Details
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