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Income taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [abstract]
Corporate income tax rate	21.00%	35.00%
Deferred tax asset	$ 654	$ 138

X

- Definition

The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

+ References

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X

- Definition

The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from a change in tax rate. [Refer: Average effective tax rate; Applicable tax rate]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 12
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-URIDate 2017-03-09

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- References

No definition available.

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