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Commitments And Contingencies (Details) - Mt Todd, Australia [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2018 AUD ($)
Loss Contingencies [Line Items]
Percentage of ownership in project	100.00%
Scenario, Plan [Member]
Loss Contingencies [Line Items]
Percentage of ownership in project	90.00%
Scenario, Plan [Member] | Jawoyn Association Aboriginal Corporation [Member]
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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Cash payment to affiliate as percentage of value of annual gold production from current mining leases.

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Minimum payment per year.

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- Definition

Represents the percentage of ownership by the entity in the project.

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Percentage of royalty on other metals.

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