Sales and advertising expense (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Sales and advertising expense
Staff costs	€ 8,514	€ 8,183	€ 5,830
Advertising campaigns	21,697	43,156	36,192
Selling expense	2,261	4,680	3,994
Sales and advertising expense	€ 32,472	€ 56,019	€ 46,016

The amount of expense arising from advertising.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of expense relating to selling activities of the entity.

+ References

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- Definition

The amount of employee benefit expenses incurred during period relating to sales and marketing.

+ References

No definition available.

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- References

No definition available.

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