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Operating Expenses - Summary of General and Administrative Expenses (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of General And Administrative Expense [Abstract]      
Personnel expenses € 19,742 € 22,613 € 8,768
Fees 10,347 7,701 4,234
Rental 584 501 305
Insurance policies 1,367 1,853 1,239
Corporate communication and travel expenses 1,599 1,136 1,010
Depreciation and amortization 422 181 74
Others 1,776 1,020 1,229
Total general and administrative expenses € 35,837 € 35,005 € 16,859