Related party transactions - Key Management (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [line items]
Fixed compensation	€ 761	€ 782	€ 781
Variable compensation	0	0	0
Compensation from stock option plan	353	353	360
Total	1,114	€ 1,135	€ 1,141
Supervisory board remuneration	180
Ordinary members
Disclosure of transactions between related parties [line items]
Supervisory board remuneration	40
Chairman
Disclosure of transactions between related parties [line items]
Supervisory board remuneration	80
Vice chairman
Disclosure of transactions between related parties [line items]
Supervisory board remuneration	€ 60

The amount of remuneration paid or payable to the entity's directors.

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.

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- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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- Definition

The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of compensation to key management personnel in variable form.

+ References

No definition available.

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