Financial liabilities - Trade payables and other liabilities (Details) - EUR (€) € in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities
Trade payables	€ 12,052		€ 8,554
Government grants (deferred income)	10,646		11,289
Liability for Virtual Stock Option Program			2,769
Contract liabilities	3,134		3,748
Others	9,866		5,258
Trade payables and other liabilities	35,698		31,618
Non-current	9,296		9,941
Current	26,402		21,677
Grants received for investment in property, plant and equipment	390	€ 341
Provision for outstanding invoices	4,675		1,210
Personnel related liabilities for vacation and bonuses	2,662		2,264
VAT payable	963
VAT receivable			1,311
Liabilities for wage and church tax	€ 478		376
IPO
Disclosure of reconciliation of liabilities arising from financing activities
Costs relating to offering			€ 565

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.

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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.

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- Definition

The amount of provision for outstanding invoices.

+ 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
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- Definition

The amount of current value added tax payables. [Refer: Value added tax payables]

+ References

+ Details

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- Definition

The amount of current value added tax receivables. [Refer: Value added tax receivables]

+ References

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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ 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

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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

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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

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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

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- Definition

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

+ References

+ Details

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- Details

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