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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
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Disclosure of inventories [abstract] |  |  |
Inventories of raw materials |  | € 69 | € 69
Depreciation of inventories |  | (69) | (69)
Total net value of the inventories | € 0 | € 0 | € 0

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