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Leases - Summary of Amounts Recognized in Consolidated Statement of Operations (Details) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]
Depreciation charge	€ 6,290	€ 4,679	€ 2,846
Interest on lease liabilities	2,003	1,718	1,721
Expense related to short-term leases (included in other expenses)	875	442	431
Expense relating to leases of low-value assets that are not short-term leases (included in other expenses)	300	90	90
Total amounts recognized in profit or loss	9,468	6,929	5,088
Buildings
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]
Depreciation charge	4,628	4,614	2,751
Equipment, Tools and Installations
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]
Depreciation charge	4	25	60
Automobiles
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]
Depreciation charge	45	€ 40	€ 35
Production Facilities
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]
Depreciation charge	€ 1,613

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- Definition

Lease expenses recognized in profit or loss.

+ References

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- Definition

The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
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- Definition

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- Definition

The amount of the expense relating to leases of low-value assets accounted for applying paragraph 6 of IFRS 16. This expense shall not include the expense relating to short-term leases of low-value assets.

+ References

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-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph d
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- Definition

The amount of the expense relating to short-term leases accounted for applying paragraph 6 of IFRS 16. This expense need not include the expense relating to leases with a lease term of one month or less. Short-term lease is a lease that, at the commencement date, has a lease term of 12 months or less. A lease that contains a purchase option is not a short-term lease.

+ References

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-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph c
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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

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-IssueDate 2020-01-01
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