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Financial Instruments - Summary of Carrying Amounts and Fair values of Group's Financial Instruments (Detail) - EUR (€) € in Thousands	Jun. 30, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Financial assets, Carrying amount	€ 62,279	€ 13,496
Financial liabilities, Carrying amount	28,736	40,210
Financial assets, Fair value	61,923	13,486
Financial liabilities, Fair value	28,736	40,210
Financial assets at fair value through profit or loss, category [member] | Other Financial Liabilities [Member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, Carrying amount	14,116	27,859
Financial liabilities, Fair value	14,116	27,859
Other Financial Assets At Amortized Cost [Member] | Trade receivables [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, Carrying amount	961	682
Financial assets, Fair value	961	682
Other Financial Assets At Amortized Cost [Member] | Other current/non-current assets [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, Carrying amount	2,065	691
Financial assets, Fair value	2,065	691
Other Financial Assets At Amortized Cost [Member] | Accounts Payable [Member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, Carrying amount	13,284	11,624
Financial liabilities, Fair value	13,284	11,624
Other Financial Assets At Amortized Cost [Member] | Other Current Liabilities [Member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, Carrying amount	1,336	727
Financial liabilities, Fair value	1,336	727
Other Financial Assets At Amortized Cost [Member] | Bonds [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, Carrying amount	59,253	12,123
Financial assets, Fair value	€ 58,897	€ 12,113

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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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