Current liabilities - Grants (Details) - European Commission Horizon 2020 Program [member] - EUR (€) € in Millions	Dec. 31, 2017	Dec. 31, 2015
Current Liabilities [Line Items]
Current government grants		€ 4.6
Entity And Academic Partners [member]
Current Liabilities [Line Items]
Current government grants	€ 6.0	€ 6.0

The amount of current government grants recognised in the statement of financial position as deferred income. [Refer: Government [member]; Deferred income; Government grants]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant