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Income Tax Expense - Summary of Movements in deferred Tax Balances (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets And Liabilities [line items]      
initial balance € 433 € 306 € (617)
Recognised in profit or loss (350) 127 931
Recognised in OCI     (8)
Final balance 83 433 306
Deferred tax assets [member]      
Deferred Tax Assets And Liabilities [line items]      
initial balance 2,027 2,656 2,557
Recognised in profit or loss (53) (629) 99
Final balance 1,974 2,027 2,656
Deferred tax liability [member]      
Deferred Tax Assets And Liabilities [line items]      
initial balance (1,594) (2,350) (3,174)
Recognised in profit or loss (297) 756 832
Recognised in OCI     (8)
Final balance € (1,891) € (1,594) € (2,350)