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Financial risk management (Schedule of Fair Value Measurements) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]
Cash and cash equivalents	$ 3,111	$ 9,325	$ 8,723	$ 24,055
Restricted cash	709	335
Trade and other receivables	5,646	6,631
Forward contracts	263
Pre-payment facility	12,230	15,000
Level 1 [Member]
Disclosure of fair value measurement of assets [line items]
Cash and cash equivalents	3,111	9,325
Restricted cash	709	335
Level 2 [Member]
Disclosure of fair value measurement of assets [line items]
Trade and other receivables	5,646	6,631
Forward contracts	263
Pre-payment facility	$ 12,230	$ 15,000

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

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The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The amount of non-current restricted cash and cash equivalents. [Refer: Restricted cash and cash equivalents]

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The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables]

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