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Income Tax Expense - Summary of Total Income Taxes (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Income Taxes [line items]      
Current tax expense income € (5,286) € (3,766) € (1,985)
Deferred tax liability asset 897 (575) (350)
Total (4,389) (4,341) (2,335)
Domestic [member]      
Disclosure Of Income Taxes [line items]      
Current tax expense income (2,116) (2,221) (585)
Deferred tax liability asset   430 (387)
Foreign [member]      
Disclosure Of Income Taxes [line items]      
Current tax expense income (3,170) (1,545) (1,400)
Deferred tax liability asset € 897 € (1,005) € 37