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Consolidated Statements of Financial Position - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Property, plant and equipment $ 82,078 $ 64,873
Deferred tax asset 65 44
Total non-current assets 82,143 64,917
Inventories 9,175 7,222
Prepayments 709 810
Trade and other receivables 4,962 3,425
Cash and cash equivalents in the statement of financial position 13,067 14,335
Total current assets 27,913 25,792
Total assets 110,056 90,709
Equity and liabilities    
Share capital 55,102 55,002
Reserves 143,452 142,374
Retained loss (135,287) (141,767)
Equity attributable to shareholders 63,267 55,609
Carrying amount of NCI 5,944 3,708
Total equity 69,211 59,317
Liabilities    
Provisions 3,797 3,456
Deferred tax liability 19,620 15,909
Non-current portion of term loan facility 1,577
Cash settled share based payments 1,826 618
Total non-current liabilities 25,243 21,560
Current portion of term loan facility 1,486 1,410
Trade and other payables 12,660 8,077
Income tax payable 1,145 345
Overdraft 311
Total current liabilities 15,602 9,832
Total liabilities 40,845 31,392
Total equity and liabilities $ 110,056 $ 90,709