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Plant And Equipment (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |
Cost | $ 11,030 | $ 12,479
Accumulated depreciation | 5,395 | 4,924
Net | 5,635 | 7,555
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 | 5,197 | 5,646
Accumulated depreciation | 5,062 | 4,591
Net | 135 | 1,055
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 | 6,500
Net | $ 5,500 | $ 6,500
Number of months to be considered held-for-sale | item | 12 |
Impairment charge | $ 1,000 |

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