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Changes in Significant Accounting Policies - Additional Information (Detail) - EUR (€)			12 Months Ended
	Jan. 01, 2021	Jan. 01, 2020	Dec. 31, 2021	Dec. 31, 2020
Disclosure Of Redesignated Financial Assets And Liabilities [Line Items]
Lease incentives			€ 1,515,000	€ 1,799,000
IFRS 16 [member]
Disclosure Of Redesignated Financial Assets And Liabilities [Line Items]
Impact on retained earnings	€ 0	€ 0
Lease incentives			€ 1,515,000	€ 1,799,000

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- Definition

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

+ References

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- Definition

The increase (decrease) in equity resulting from the appropriation of retained earnings. [Refer: Retained earnings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 106
-Subparagraph d
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-URIDate 2021-03-24

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Lease incentive.

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