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Corporate general and administrative expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Corporate general and administrative expenses [abstract]
Salaries and benefits	$ 2,173	$ 2,153
Directors' fees	269	251
Share-based payments	1,930	1,237
Professional fees	477	639
Office and general	1,802	1,075
Corporate general and administrative expenses	$ 6,651	$ 5,355

X

- Definition

The amount of remuneration paid or payable to the entity's directors.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of expense from share-based payment transactions with employees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
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X

- Definition

The amount of fees paid or payable for professional services.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of expense relating to selling, general and administrative activities of the entity.

+ References

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-Number 1
-IssueDate 2017-01-01
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X

- Definition

The amount of expense from employee benefits (other than termination benefits) that are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References

No definition available.

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X

- Definition

Office and general expenses.

+ References

No definition available.

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