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Related Party Transactions (Schedule of Related Party) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [line items]    
Salaries and wages $ 4,704 $ 3,987
Director fees 594 357
Consulting fees 138 127
Share-based payments 3,672 13,527
Key management personnel compensation 9,108 17,998
Gold Group Management Inc and Mill Street Services Ltd [member]    
Disclosure of transactions between related parties [line items]    
Personnel costs 138 121
General and administrative expenses 175 103
Purchase of goods and service related rarty transactions $ 313 $ 224