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Commitments And Contingencies (Details) - Mt Todd, Australia [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2018 AUD ($)
Loss Contingencies [Line Items]
Percentage of outstanding common shares	90.00%
Percentage of participating interest in gold project by affiliate	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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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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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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Percentage of participating interest in gold project by affiliate.

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Percentage of royalty on other metals.

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