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Income Tax Expense - Summary of Movements in deferred Tax Balances (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Assets And Liabilities [line items]      
initial balance € 83 € 433 € 306
Recognised in profit or loss (575) (350) 127
Final balance (492) 83 433
Deferred tax assets [member]      
Deferred Tax Assets And Liabilities [line items]      
initial balance 1,974 2,027 2,656
Recognised in profit or loss 49 (53) (629)
Final balance 2,023 1,974 2,027
Deferred tax liability [member]      
Deferred Tax Assets And Liabilities [line items]      
initial balance (1,891) (1,594) (2,350)
Recognised in profit or loss (624) (297) 756
Final balance € (2,515) € (1,891) € (1,594)