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Management of Financial Risks - Additional Information (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Financial Risk Management [line items]
Cash and cash equivalents	€ 137,880	€ 256,473	€ 323,381	€ 114,555
Operating losses and cash out flows from operation	(147,693)	(114,531)	(44,674)
Accumulated deficit and reserves	(279,300)
Net cash used in operating activities	€ (114,314)	€ (59,538)	€ (26,763)
Top of range [member]
Disclosure Of Financial Risk Management [line items]
Percentage of purchases and other external expenses made in U.S. dollars	12.00%	12.00%	12.00%

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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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