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Employee Benefits - Disclosure of Detailed Information About Employee Benefits (Detail) - EUR (€) € in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Short-term employee benefits expense [abstract]
Salaries and wages	€ 3,454	€ 2,876	€ 6,476	€ 5,505
WBSO subsidy	(1,071)	(733)	(2,319)	(1,900)
Social security premiums	291	198	579	449
Health insurance	65	69	215	188
Pension costs	294	188	564	390
Share-based compensation	1,806	2,109	3,058	4,554
Other personnel expense	1,150	224	1,786	433
Total employee benefits expense	€ 5,989	€ 4,931	€ 10,359	€ 9,619

X

- Definition

The amount of expense from share-based payment transactions with employees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
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X

- Definition

The amount of expense from employee benefits (other than termination benefits), which are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services, that the entity does not separately disclose in the same statement or note. [Refer: Employee benefits expense]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_9&doctype=Standard
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X

- Definition

The amount of expense from employee benefits (other than termination benefits) that are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2018-01-01
-Paragraph 112
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
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- References

No definition available.

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X

- Definition

A class of employee benefits expense that represents social security contributions. [Refer: Employee benefits expense]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 9
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_9&doctype=Standard
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X

- Definition

A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Health insurance.

+ References

No definition available.

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X

- Definition

Pension costs.

+ References

No definition available.

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- Definition

WBSO subsidy.

+ References

No definition available.

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