Contingent consideration - Milestone Payments (Details) - Joint ventures where entity is venturer $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)
Disclosure of transactions between related parties [line items]
2018	$ 100
2020	2,625
2021	5,125
Commitments made by entity, related party transactions	$ 7,850

The amount of related-party commitments made by the entity to do something if a particular event occurs or does not occur in the future, including executory contracts (recognised and unrecognised). [Refer: Related parties [member]]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 24
-IssueDate 2017-01-01
-Paragraph 21
-Subparagraph i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_21_i&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_CommitmentsMadeByEntityRelatedPartyTransactions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration