Notes to the Balance Sheet - Intangible assets - Additional Information (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Intangible Assets [Line Items]
Contractual commitments for acquisition of intangible assets	€ 0
Accumulated depreciation, amortisation and impairment
Intangible Assets [Line Items]
Impairment	9,585	€ 7,875
Accumulated depreciation, amortisation and impairment \| Internally Generated Intangible Assets
Intangible Assets [Line Items]
Impairment	€ 708	€ 7,806

The amount of contractual commitments for the acquisition of intangible assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2023-01-01
-Paragraph 122
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2023-en-r&anchor=para_122_e&doctype=Standard
-URIDate 2023-03-23

Name:	ifrs-full_ContractualCommitmentsForAcquisitionOfIntangibleAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant