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Customer Accounts Receivable and Other Current Assets - Summary of Other Current Assets (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of accounts receivables [abstract]        
Research tax credit € 9,217 € 7,228 € 5,702 € 4,340
Other tax claims 5,258 2,618 2,550  
Other receivables 1,192 1,883 1,409  
Prepaid expenses 2,054 2,725 1,850  
Total € 17,721 € 14,454 € 11,512