Financial Assets and Liabilities - Summary of Fair Value Hierarchy (Details) - EUR (€) € in Thousands	Dec. 31, 2023	Dec. 31, 2022
Categories of financial assets [abstract]
Total financial assets	€ 439,222	€ 758,741
Categories of financial liabilities [abstract]
Convertible senior notes	407,100
Derivative liabilities	143,296	157,950
Total financial liabilities	882,127	767,359
Carrying amount [member]
Categories of financial assets [abstract]
Financial assets at amortised cost	7,275	298,180
Categories of financial liabilities [abstract]
Financial liabilities at amortised cost	545,472	399,186
Total financial liabilities at fair value through profit or loss	143,296	157,950
Fair value [member]
Categories of financial assets [abstract]
Financial assets at amortised cost	7,266	295,843
Categories of financial liabilities [abstract]
Financial liabilities at amortised cost	529,385	382,459
Total financial liabilities at fair value through profit or loss	143,296	157,950
Level 1 [member] \| Carrying amount [member]
Categories of financial assets [abstract]
Marketable Securities	7,275	298,180
Level 1 [member] \| Fair value [member]
Categories of financial assets [abstract]
Marketable Securities	7,266	295,843
Level 3 [member]
Categories of financial liabilities [abstract]
Derivative liabilities	143,296	157,950
Level 3 [member] \| Carrying amount [member]
Categories of financial liabilities [abstract]
Convertible senior notes	407,095	399,186
Royalty funding	138,377	0
Derivative liabilities	143,296	157,950
Level 3 [member] \| Fair value [member]
Categories of financial liabilities [abstract]
Convertible senior notes	385,410	382,459
Royalty funding	143,975	0
Derivative liabilities	€ 143,296	€ 157,950

Convertible senior notes.

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Marketable securities explanatory.

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Royalty funding.

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The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) 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 receive 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 the entity’s own equity instruments do not include puttable financial instruments 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. [Refer: Financial instruments, class [member]; Financial liabilities]

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The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets 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, and adjusted for any impairment. [Refer: Financial assets]

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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: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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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]

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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]

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The amount of notes and debentures issued by the entity.

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