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Commitments and contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Commitments and contingencies [Line Items] |  |
Minimum operating lease payments recognised as expense | $ 8,873 | $ 10,417
Not later than one year [member] |  |
Disclosure of Commitments and contingencies [Line Items] |  |
Minimum operating lease payments recognised as expense | 1,543 | 1,543
Later than one year and not later than five years [member] |  |
Disclosure of Commitments and contingencies [Line Items] |  |
Minimum operating lease payments recognised as expense | 6,173 | 6,173
Later than five years [member] |  |
Disclosure of Commitments and contingencies [Line Items] |  |
Minimum operating lease payments recognised as expense | $ 1,157 | $ 2,701

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- Definition The portion of operating lease payments that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with any amounts guaranteed by the lessee or by a party related to the lessee recognised as an expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_c&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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