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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Impacts of IFRS Adjustments for Intangible Assets and Goodwill (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | ---
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Intangible assets |  | € 1,991 | € 2,006
Goodwill | € 3,947 | 3,846 | 1,921
Total | € 5,892 | 5,837 | 3,927
Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Intangible assets |  | 1,991 | 2,312
Goodwill |  | 3,523 | 1,921
Total |  | 5,514 | 4,233
Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Total |  | 323 | (306)
Effect of transition to IFRSs [member] | Write-off of depreciation of goodwill [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Goodwill |  | 323 |
Total |  | € 323 |
Effect of transition to IFRSs [member] | Costs not eligible for capitalization [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Intangible assets |  |  | (306)
Total |  |  | € (306)

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