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Income taxes (Schedule of Components of Income Tax Expense (Recovery)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [abstract]
Current income tax expense	$ 161
Deferred income tax expense (recovery)	(588)	210
Income tax expense (recovery)	$ (427)	$ 210

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax that relate to continuing operations. [Refer: Continuing operations [member]; Current tax expense (income); Deferred tax expense (income)]

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