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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)