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Commitments And Contingencies (Details) - Mt Todd, Australia $ in Thousands | 12 Months Ended
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Dec. 31, 2018 AUD ($)
Loss Contingencies [Line Items] |
Percentage of ownership in project | 100.00%
Scenario, Plan |
Loss Contingencies [Line Items] |
Percentage of ownership in project | 90.00%
Scenario, Plan | Jawoyn Association Aboriginal Corporation |
Loss Contingencies [Line Items] |
Percentage of ownership in project | 10.00%
Percentage of royalty on gold | 1.00%
Percentage of royalty on other metals | 1.00%
Minimum payment per year | $ 50

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