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Share Capital and Reserves - Analysis of Share Capital Reserves (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of reserves within equity [abstract]      
Legal reserve € 10,971 € 10,971 € 10,971
Majority shareholder capital contribution 488 488 488
Foreign operations translation reserve 5,282 5,055 12,606
Remeasurement of defined benefit plan 457 (116)  
Total € 17,198 € 16,398 € 24,065