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Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Cost $ 11,070 $ 11,030
Accumulated depreciation 5,447 5,395
Net 5,623 5,635
Impairment charge   1,000
Immaterial calculation differences    
Property, Plant and Equipment [Line Items]    
Depreciation   695
Mt Todd, Australia    
Property, Plant and Equipment [Line Items]    
Cost 5,237 5,197
Accumulated depreciation 5,114 5,062
Net 123 135
Corporate, United States    
Property, Plant and Equipment [Line Items]    
Cost 333 333
Accumulated depreciation 333 333
Used mill equipment, Canada    
Property, Plant and Equipment [Line Items]    
Cost 5,500 5,500
Net $ 5,500 $ 5,500
Number of months to be considered held-for-sale 12 months 12 months
Impairment charge   $ 1,000