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Financial Assets and Liabilities - Summary of Fair Value Hierarchy (Detail) - EUR (€) € in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Disclosure of detailed information about financial instruments [line items] |  |  |  |
Derivative liabilities | € 174,581 | € 150,670 |  |
Level 3 [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Derivative liabilities | 174,581 | 150,670 | € 197,291 | € 143,296
Carrying amount [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial liabilities measured at amortized cost | 752,909 | 763,586 |  |
Financial liabilities measured at fair value through profit or loss | 174,581 | 150,670 |  |
Carrying amount [member] | Level 3 [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Convertible senior notes | 449,562 | 458,207 |  |
Royalty funding liabilities | 303,347 | 305,379 |  |
Derivative liabilities | 174,581 | 150,670 |  |
Fair value [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Financial liabilities measured at amortized cost | 741,684 | 743,961 |  |
Financial liabilities measured at fair value through profit or loss | 174,581 | 150,670 |  |
Fair value [member] | Level 3 [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Convertible senior notes | 433,666 | 438,288 |  |
Royalty funding liabilities | 308,018 | 305,673 |  |
Derivative liabilities | € 174,581 | € 150,670 |  |

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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 amount of financial liabilities at amortised cost. The amortised cost is the amount at which financial liabilities are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount. [Refer: Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 8 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_g&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of financial liabilities that meet either of the following conditions: (a) they meet the definition of held for trading; or (b) upon initial recognition they are designated by the entity as at fair value through profit or loss. An entity may use this designation only when permitted by paragraph 4.3.5 of IFRS 9 (embedded derivatives) or when doing so results in more relevant information, because either: (a) it eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognising the gains and losses on them on different bases; or (b) a group of financial liabilities or financial assets and financial liabilities is managed and its performance is evaluated on a fair value basis, in accordance with a documented risk management or investment strategy, and information about the group is provided internally on that basis to the entity’s key management personnel (as defined in IAS 24). [Refer: At fair value [member]; Key management personnel of entity or parent [member]; Derivatives [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 8 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of notes and debentures issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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