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Cost of sales (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disclosure of cost of sales [abstract]
Salaries and employee benefits	$ 6,119	$ 5,277	$ 17,599	$ 16,544
Raw materials and consumables	4,754	2,560	14,034	10,105
Utilities	1,237	772	3,246	3,006
Other costs	447	343	1,948	1,931
Changes in inventories	252	(1,258)	1,116	(1,229)
Cost of sales	$ 12,809	$ 7,694	$ 37,943	$ 30,357

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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