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Operating Expenses - Summary of Sales and Marketing Expenses (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of sales and marketing expense [Abstract]
Personnel expenses	€ 6,976	€ 4,954	€ 133
Fees	2,480	4,447	339
Marketing, tradeshows and travel expenses	5,984	1,393	20
Others	384	487
Total sales and marketing expenses	€ 15,824	€ 11,282	€ 491

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- Definition

Disclosure of sales and marketing expense.

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Marketing, tradeshows and travel expenses.

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Personnel sale expenses.

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The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]

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The amount of fees paid or payable for professional services.

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The amount of expense relating to the marketing and selling of goods or services.

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