Financial risk management (Schedule of Fair Value Measurements) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of fair value measurement of assets [line items]
Cash and cash equivalents	$ 9,325	$ 24,055	$ 1,319
Restricted cash	331	151
Available-for-sale investment		503
Long-term investments	4	28
Trade and other receivables	6,631	4,002
Pre-payment facility	15,000
Level 1 [Member]
Disclosure of fair value measurement of assets [line items]
Cash and cash equivalents	9,325	24,055
Restricted cash	331	151
Available-for-sale investment		503
Long-term investments	4	28
Level 2 [Member]
Disclosure of fair value measurement of assets [line items]
Trade and other receivables	6,631	4,002
Credit facilities		7,758
Pre-payment facility	$ 15,000

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]

+ References

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The amount of current financial assets available-for-sale. [Refer: Financial assets available-for-sale; Current financial assets]

+ References

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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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No definition available.

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- Definition

The amount of loans received.

+ References

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The amount of non-current investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method; Non-current assets; Investments other than investments accounted for using equity method]

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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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