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Customer Accounts Receivable and Other Current Assets - Summary of Customer Accounts Receivable and Related Receivables (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Trade and other receivables [abstract]      
Accounts receivable € 1,265 € 1,263 € 13
Valuation allowance   (13) € (13)
Total net value of accounts receivable € 1,265 € 1,250