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Inventories and Work in Progress - Summary of Inventories (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of inventories [abstract]      
Inventories of raw materials   € 69 € 69
Depreciation of inventories   (69) (69)
Total net value of the inventories € 0 € 0 € 0