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Cost of sales (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of cost of sales [abstract]
Salaries and employee benefits	$ 22,314	$ 23,430
Raw materials and consumables	14,252	15,065
Utilities	3,902	4,113
Other costs	2,318	1,768
Changes in inventories	(2,748)	1,769
Cost of sales	$ 40,038	$ 46,145

X

- Definition

The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories.

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