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Financial liabilities - Disclosure of remaining contractual maturities of financial liabilities (Details) - EUR (€) € in Thousands | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Conditional advances | € 0 | € 0 | € 6,771 |
Conditional advances, undiscounted cash flows |  |  | 6,813 |
Royalty certificates | 30,237 | 13,023 | 12,229 |
Royalty certificates, undiscounted cash flows | 0 | 0 | 0 |
Lease liabilities | 1,856 | 2,363 | 540 | € 1,384
Gross lease liabilities | 1,906 | 2,512 | 575 |
Derivative financial liabilities | 0 | 4,786 | 2,579 | 566
Derivative financial liabilities, undiscounted cash flows |  | 4,786 | 2,579 |
Total financial liabilities | 32,093 | 114,004 | 77,045 |
Financial liabilities, undiscounted cash flows | 1,906 | 122,680 | 81,500 |
LESS THAN 1 YEAR |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Conditional advances, undiscounted cash flows |  |  | 3,697 |
Royalty certificates, undiscounted cash flows | 0 | 0 | 0 |
Gross lease liabilities | 1,340 | 993 | 406 |
Derivative financial liabilities, undiscounted cash flows |  | 1,166 | 2,579 |
Financial liabilities, undiscounted cash flows | 1,340 | 38,468 | 20,747 |
FROM 1 TO 2 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Conditional advances, undiscounted cash flows |  |  | 1,490 |
Royalty certificates, undiscounted cash flows | 0 | 0 | 0 |
Gross lease liabilities | 450 | 996 | 162 |
Derivative financial liabilities, undiscounted cash flows |  | 0 | 0 |
Financial liabilities, undiscounted cash flows | 450 | 56,698 | 15,192 |
FROM 2 TO 5 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Conditional advances, undiscounted cash flows |  |  | 1,626 |
Royalty certificates, undiscounted cash flows | 0 | 0 | 0 |
Gross lease liabilities | 116 | 516 | 7 |
Derivative financial liabilities, undiscounted cash flows |  | 3,620 | 0 |
Financial liabilities, undiscounted cash flows | 116 | 27,507 | 45,561 |
LONGER THAN 5 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Conditional advances, undiscounted cash flows |  |  | 0 |
Royalty certificates, undiscounted cash flows | 0 | 0 | 0 |
Gross lease liabilities | 0 | 7 | 0 |
Derivative financial liabilities, undiscounted cash flows |  | 0 | 0 |
Financial liabilities, undiscounted cash flows | 0 | 7 | 0 |
Heights convertible notes |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes |  | 21,574 | 29,605 |
Convertible loans notes, undiscounted cash flows |  | 24,063 | 36,750 |
Heights convertible notes | LESS THAN 1 YEAR |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 8,750 | 10,522 |
Heights convertible notes | FROM 1 TO 2 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 8,750 | 9,997 |
Heights convertible notes | FROM 2 TO 5 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 6,563 | 16,231 |
Heights convertible notes | LONGER THAN 5 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 0 | 0 |
Kreos & Claret convertible notes (OCABSA) |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes |  | 23,370 | 21,643 |
Convertible loans notes, undiscounted cash flows |  | 30,653 | 30,903 |
Derivative financial liabilities | € 0 | 1,166 | 2,579 | € 0
Kreos & Claret convertible notes (OCABSA) | LESS THAN 1 YEAR |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 2,250 | 2,250 |
Kreos & Claret convertible notes (OCABSA) | FROM 1 TO 2 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 19,943 | 2,250 |
Kreos & Claret convertible notes (OCABSA) | FROM 2 TO 5 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 8,460 | 26,403 |
Kreos & Claret convertible notes (OCABSA) | LONGER THAN 5 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 0 | 0 |
Kreos/Claret bond loans |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes |  | 46,401 |  |
Convertible loans notes, undiscounted cash flows |  | 58,080 |  |
Kreos/Claret bond loans | LESS THAN 1 YEAR |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 24,016 |  |
Kreos/Claret bond loans | FROM 1 TO 2 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 25,715 |  |
Kreos/Claret bond loans | FROM 2 TO 5 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 8,348 |  |
Kreos/Claret bond loans | LONGER THAN 5 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Convertible loans notes, undiscounted cash flows |  | 0 |  |
PGE |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Borrowings |  | 2,488 | 3,678 |
Borrowings, undiscounted cash flows |  | 2,586 | 3,880 |
PGE | LESS THAN 1 YEAR |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Borrowings, undiscounted cash flows |  | 1,293 | 1,293 |
PGE | FROM 1 TO 2 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Borrowings, undiscounted cash flows |  | 1,293 | 1,293 |
PGE | FROM 2 TO 5 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Borrowings, undiscounted cash flows |  | 0 | 1,293 |
PGE | LONGER THAN 5 YEARS |  |  |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |  |  |
Borrowings, undiscounted cash flows |  | € 0 | € 0 |

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- Definition The amount of contractual undiscounted cash flows in relation to bank borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph IG31A -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_IG31A&doctype=Implementation%20Guidance -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph B11D -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_B11D&doctype=Appendix&subtype=B -URIDate 2025-03-27 + Details
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- Definition The amount of outstanding funds that the entity is obligated to repay. + 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 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 amount of contractual undiscounted cash flows in relation to derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 72 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_72_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 39 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_39_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 72 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_72_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard -URIDate 2025-03-27 + Details
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