Mineral Properties - Properties (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Mineral Properties, Net	$ 2,146	$ 2,146
Mt Todd, Australia
Property, Plant and Equipment [Line Items]
Mineral Properties, Net	$ 2,146	$ 2,146

Mineral properties, net of adjustments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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