Financial liabilities - Trade payables and other liabilities (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial liabilities
Trade payables	€ 8,554	€ 5,429
Government grants (deferred income)	11,289	12,034
Liability for Virtual Stock Option Program	2,769	7,093
Contract liabilities	3,748	297
Others	5,258	5,618
Trade payables and other liabilities	31,618	30,471
Non-current	9,941	11,240
Current	21,677	19,231
Grants received for investment in property, plant and equipment	793	3,042	€ 6,802
Personnel related liabilities for vacation and bonuses	2,264	1,955
Liabilities for wage and church tax	376	307
Costs relating to anticipated initial public offering	565	€ 1,695
Grants refunded related to disposed property, plant and equipment	€ 358

Costs incurred but not paid related to anticipated initial public offering.

No definition available.

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- Definition

The cash inflow from grants received for investment in property, plant and equipment, classified as investing activities.

+ References

No definition available.

+ Details

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- Definition

The amount of liabilities for wage and church tax.

+ References

No definition available.

+ Details

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- Definition

The amount of liabilities for Virtual Stock Option Program.

+ References

No definition available.

+ Details

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- Definition

The amount of cash outflow relating to grants refunded related to disposal of property, plant and equipment.

+ References

No definition available.

+ Details

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- Definition

The amount of trade and other payables, classified as other.

+ References

No definition available.

+ Details

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- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2019-01-01
-Paragraph 105
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-URIDate 2019-03-27

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- References

No definition available.

+ Details

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- Definition

The amount of assistance by government in the form of transfers of resources to an entity in return for past or future compliance with certain conditions relating to the operating activities of the entity, recognised as deferred income. They exclude those forms of government assistance that cannot reasonably have a value placed upon them and transactions with government that cannot be distinguished from the normal trading transactions of the entity. [Refer: Government [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2019-01-01
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+ Details

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Balance Type:	credit
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- Definition

The amount of non-current trade payables and non-current other payables. [Refer: Other non-current payables; Non-current trade payables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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- Definition

The amount of accruals for employee benefits (other than termination benefits) that are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services. [Refer: Accruals classified as current]

+ References

+ Details

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- Definition

The amount of current trade payables and current other payables. [Refer: Current trade payables; Other current payables]

+ References

+ Details

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- Definition

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

+ References

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

The amount of trade payables and other payables. [Refer: Trade payables; Other payables]

+ References

+ Details

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