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Trade and other receivables (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Trade and other receivables [abstract]    
Trade receivables $ 3,779 $ 2,126
Value added taxes receivable 2,751 1,638
Other receivables 101 238
Trade and other receivables $ 6,631 $ 4,002