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Income Tax Expense - Summary of Deferred Tax Assets and Liabilities (Detail) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Deferred Tax Assets And Liabilities [line items] |  |
Total deferred tax assets | € 1,974 | € 2,027
Deferred tax liabilities | (430) | (42)
Total deferred tax liabilities | (1,891) | (1,594)
Deferred Costs [Member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Deferred tax assets | 845 |
Provision for contingent liabilities [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Deferred tax assets | 677 | 621
Inventories obsolescence [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Deferred tax assets | 297 | 152
Intercompany profit on inventory [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Deferred tax assets |  | 1,162
Deferred revenues and costs IFRS 15 [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Deferred tax assets | 59 |
Other temporary differences [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Deferred tax assets | 96 | 92
Deferred tax liabilities | (131) | (143)
Deferred revenue IFRS 15 [Member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Deferred tax liabilities | (934) | (716)
Unrealised net gains on foreign exchange [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Deferred tax liabilities | (396) | € (735)
Withholding tax on unremitted earnings of subsidiaries [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Deferred tax liabilities | € (430) |

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