The amount represents the real estate transfer tax expenses.

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of cost related to the issuance of shares.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Segment information - Additional information (Details) - EUR (€) € in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment information
Real estate transfer tax expenses		€ 1,200		€ 1,200
Property, plant and equipment	€ 10,784		€ 10,784		€ 8,376
Right-of-use assets.	24,750		24,750		24,932
-United States
Segment information
Property, plant and equipment	368		368		286
Right-of-use assets.	876		876		€ 1,042
Corporate
Segment information
Real estate transfer tax expenses			0	1,200
Follow-on public offering \| Corporate
Segment information
Share issue related cost	€ 173		€ 173
IPO \| Corporate
Segment information
Share issue related cost		€ 109		€ 318