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Trade and other receivables (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Trade and other receivables [abstract]    
Trade receivables $ 3,711 $ 3,779
Value added taxes receivable 1,746 2,751
Other receivables 189 101
Trade and other receivables $ 5,646 $ 6,631