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Operating Expenses - Summary of Sales and Marketing Expenses (Detail) - EUR (€) € in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Disclosure of sales and marketing expense [abstract]
Personnel expenses	€ 5,961	€ 4,147
Fees	1,541	3,869
Depreciation and amortization	391	3
Marketing, tradeshows and travel expenses	342	1,692
Others	92	17
Total sales and marketing expenses	€ 8,327	€ 9,728

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- Definition

Depreciation and amortization sales and marketing expense.

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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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- Definition

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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