Financial Instruments - Summary of Changes of the Liabilities from Financing Activities Classified as Cash Effective and Non-cash Effective (Detail) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Disclosure Of Detailed Information About Changes of the Liabilities from Financing activities Classified as Cash Effective andNoncashEffective [Line Items]
Liabilities from financing activities at beginning of period	€ 17,933	€ 34,395
Cash effective	(2,959)	(2,012)
Non-cash effective	661	(14,450)
Liabilities from financing activities at end of period	15,635	17,933
Liabilities for warrants [Member]
Disclosure Of Detailed Information About Changes of the Liabilities from Financing activities Classified as Cash Effective andNoncashEffective [Line Items]
Liabilities from financing activities at beginning of period	1,730	18,993
Cash effective	0	0
Non-cash effective	(1,730)	(17,263)
Liabilities from financing activities at end of period	0	1,730
Lease liabilities [Member]
Disclosure Of Detailed Information About Changes of the Liabilities from Financing activities Classified as Cash Effective andNoncashEffective [Line Items]
Liabilities from financing activities at beginning of period	16,203	15,402
Cash effective	(2,959)	(2,012)
Non-cash effective	2,391	2,813
Liabilities from financing activities at end of period	€ 15,635	€ 16,203

- 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]]

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