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Operating Expenses - Summary of Personnel Expenses (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of personnel expense [Abstract]
Wages and salaries	€ 22,451	€ 14,651	€ 7,243
Social security contributions	7,157	3,903	3,193
Expenses for pension commitments	1,583	982	116
Employer contribution to bonus shares	1,857	6,456	1,198
Share-based payments	30,781	34,353	10,419
Total	€ 63,830	€ 60,345	€ 22,168

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- Definition

Disclosure of personnel expense [Abstract]

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No definition available.

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Expenses for pension commitments.

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Personnel expenses.

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- Definition

Adjustments for share-based payments to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of employer contributions to retirement benefit plans.

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

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

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