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Non-Current Financial Assets - Summary of Non-Current Financial Assets (Detail) - EUR (€) € in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of non financial assets.
Non-current financial assets	€ 3,012	€ 2,745	€ 2,711
Deposits [member]
Disclosure of non financial assets.
Non-current financial assets	577	824	716
Pledged securities [member]
Disclosure of non financial assets.
Non-current financial assets	1,102	611	611
Liquidity contract [member]
Disclosure of non financial assets.
Non-current financial assets	€ 1,333	€ 1,310	€ 1,384

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- Definition

Disclosure of non financial assets [Line Items]

+ References

No definition available.

+ Details

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- Definition

The amount of non-current financial assets. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard
-URIDate 2017-03-09

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- Details

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- Details

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- Details

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