| Taxation - Summary of Income Tax Expense Recognized in The Consolidated Statement of Profit or Loss (Detail) - EUR (€) € in Thousands | 12 Months Ended | ||
|---|---|---|---|
| Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | |
| Current income tax expense | |||
| Current income tax expense for the year | € (927) | € (1,058) | € (200) | 
| Adjustments in respect of current income tax of previous years | (34) | (64) | 0 | 
| Total current tax expense | (961) | (1,122) | (200) | 
| Deferred tax expense | |||
| Origination and reversal of temporary differences and tax losses | 11,609 | 16,950 | 0 | 
| (De)recognition of deferred tax assets | (11,152) | (16,464) | (152) | 
| Total deferred tax expense | 457 | 486 | (152) | 
| Effective tax (rate), Amount | € (504) | € (636) | € (352) | 
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- Definition Adjustments of tax expense (income) recognised in the period for current tax of prior periods. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Definition The amount of current tax expense (income) and adjustments for the current tax of prior periods. [Refer: Current tax expense (income); Adjustments for current tax of prior periods] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- References No definition available. 
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- Definition The amount of deferred tax expense arising from the write-down, or reversal of a previous write-down, of a deferred tax asset. [Refer: Deferred tax assets] Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- References No definition available. 
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- Definition The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)] Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Definition The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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