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Warrants and Share-based Payment - Summary of Warrant Compensation Cost (Detail) - Warrants [member] - EUR (€) € in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total warrant compensation costs	€ 9,435	€ 4,679
Research and development cost [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total warrant compensation costs	4,934	2,386
General and administrative expense [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Total warrant compensation costs	€ 4,501	€ 2,293

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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.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2018-01-01
-Paragraph 112
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-URIDate 2018-03-16

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