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Risk management (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Statement of financial risk management [Line Items] |  |
Financial assets held for managing liquidity risk | $ 619 | $ 1,008
United States of America [Member] |  |
Statement of financial risk management [Line Items] |  |
Financial assets held for managing liquidity risk | 612 | 591
Other O.E.C.D. [Member] |  |
Statement of financial risk management [Line Items] |  |
Financial assets held for managing liquidity risk | 0 | 409
Multilateral [Member] |  |
Statement of financial risk management [Line Items] |  |
Financial assets held for managing liquidity risk | 0 | 0
Latin America [Member] |  |
Statement of financial risk management [Line Items] |  |
Financial assets held for managing liquidity risk | $ 7 | $ 8

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- Definition The amount of financial assets held for managing liquidity risk (for example, financial assets that are readily saleable or expected to generate cash inflows to meet cash outflows on financial liabilities). [Refer: Liquidity risk [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph B11E -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_B11E&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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