Income Tax Expense - Summary of Reconciliation of Effective and Nominal Tax Expense (Detail) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Major components of tax expense (income) [abstract]
(Loss) before taxes	€ (147,692)	€ (114,531)	€ (44,674)
Theoretical group tax rate	33.33%	33.33%	33.33%
Nominal tax expense	€ 49,226	€ 38,173	€ 14,890
Permanent differences			6,089
Research tax credit	3,110	2,409	1,895
Share-based compensation	(10,260)	(11,451)	(3,473)
Non recognition of deferred tax assets related to tax losses and temporary differences	(41,453)	(29,195)	(19,211)
Other differences	622	64	€ 190
Effective tax expense	€ 1	€ 0
Effective tax rate	0.00%	0.00%	0.00%

Increase (decrease) in tax benefit arising from permanent differences.

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Increase decrease in tax effect arising from research tax credits.

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Increase decrease tax benefit arising from share based compensation expense.

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Adjustments for deferred tax expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Deferred tax expense (income); Profit (loss)]

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The applicable income tax rate.

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The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

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The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax that relate to continuing operations. [Refer: Continuing operations [member]; Current tax expense (income); Deferred tax expense (income)]

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that the entity does not separately disclose in the same statement or note. [Refer: Accounting profit; Applicable tax rate]

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The profit (loss) from continuing operations before tax expense or income. [Refer: Profit (loss)]

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The product of the accounting profit multiplied by the applicable tax rate(s). [Refer: Accounting profit; Applicable tax rate]

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