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Customer Accounts Receivable and Other Current Assets - Additional Information (Detail) - EUR (€) € in Thousands		12 Months Ended
	Jul. 04, 2016	Dec. 31, 2017	Dec. 31, 2015
Trade and other receivables [abstract]
Trade receivables payment terms		Less than one year
Research tax credit current adjustment	€ 900	€ 113	€ (18)

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- Definition

Research tax credit current adjustment.

+ References

No definition available.

+ Details

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- Definition

The description of the significant payment terms in contracts with customers.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 15
-IssueDate 2017-01-01
-Paragraph 119
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2017-03-01&anchor=para_119_b&doctype=Standard
-URIDate 2017-03-09

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- References

No definition available.

+ Details

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