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Revenue (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | € 139,623 | € 160,408 | € 129,058
Sales of goods |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 44,179 | 81,164 | 81,340
Commissions |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 34,642 | 25,011 | 14,394
Fulfillment |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 32,409 | 26,855 | 14,980
Value added services |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 19,059 | 20,492 | 14,553
Marketing and Advertising |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | 7,709 | 6,089 | 2,262
Other revenue |  |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |  |
Revenue | € 1,625 | € 797 | € 1,529

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_113_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_114&doctype=Standard -URIDate 2020-01-01 + Details
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