Intangible assets and property, plant and equipment - Intangibles (Details) - EUR (€) € in Thousands	Dec. 31, 2020	Dec. 31, 2019
Intangible assets and goodwill
Intangible assets	€ 1,143	€ 1,356
Capitalized cost
Intangible assets and goodwill
Intangible assets	454
Software
Intangible assets and goodwill
Intangible assets	806	611
Licenses
Intangible assets and goodwill
Intangible assets	56	83
Prepayments made on intangible assets
Intangible assets and goodwill
Intangible assets	€ 281	€ 662

The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2020-01-01
-Paragraph 118
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 54
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_c&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_IntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant