Equity - Common Shares (Details) - Common shares - EUR (€) € / shares in Units, € in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2021	Dec. 31, 2020
Disclosure of classes of share capital [line items]
Number of shares issued and fully paid	22,445,242	22,117,643
Par value per share (in euros per share)	€ 0.12
Authorized but unissued share capital	€ 6,787	€ 6,826

The number of shares issued by the entity, for which full payment has been received.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 79
-Subparagraph a
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_79_a_ii&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_NumberOfSharesIssuedAndFullyPaid
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant