Segment reporting - Segments (Details) € in Thousands	12 Months Ended
Dec. 31, 2019 EUR (€) segment	Dec. 31, 2018 EUR (€)	Dec. 31, 2017 EUR (€)
Segment reporting
Number of reportable segments \| segment	2
Revenues	€ 24,602	€ 26,009	€ 23,178
Gross profit	(14,222)	(8,753)	(8,474)
PPE	27,343	27,675
Trade receivables	5,915	6,030
Trade payables	2,797	2,945
Allowance for slow-moving inventory	(21)	(417)	(515)
Systems
Segment reporting
Revenues	13,454	12,248	11,534
Gross profit	€ 4,284	€ 3,708	€ 4,258
Gross profit margin (as a percent)	31.80%	30.30%	36.90%
PPE	€ 13,093	€ 11,804	€ 13,070
Sale of used printers	2,007	1,489	2,556
Services
Segment reporting
Revenues	11,148	13,761	11,644
Gross profit	€ 2,892	€ 5,437	€ 5,067
Gross profit margin (as a percent)	25.90%	39.50%	43.50%
PPE	€ 14,250	€ 15,871	€ 14,628

The amount of current receivables from contracts with customers. [Refer: Receivables from contracts with customers]

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The percentage of the entity's revenue. [Refer: Revenue]

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The profit (loss) before tax expense or income. [Refer: Profit (loss)]

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The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period.

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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.

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The current amount of payment due to suppliers for goods and services used in entity's business. [Refer: Current liabilities; Trade payables]

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Represents the sale of used goods.

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