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Total Operating Expenses - Additional Information (Detail) - EUR (€) € in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disclosure Of Operating Expenses [abstract]
Research and development costs	€ 9,984	€ 12,523	€ 20,355	€ 22,821
Management and administration costs	3,119	2,639	5,055	5,491
Litigation and opposition	59	552	123	849
Other operating expenses	€ 3,684	€ 2,745	€ 7,624	€ 5,134

X

- Definition

The amount of expense relating to general and administrative activities of the entity.

+ References

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X

- Definition

The amount of expenditure directly attributable to research or development activities, recognised in profit or loss.

+ References

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

Disclosure Of Operating Expenses [abstract].

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No definition available.

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- Definition

Litigation costs.

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No definition available.

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X

- Definition

Other operating expenses.

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No definition available.

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