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Other Assets - Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Deferred offering costs RMB Loan $ 126us-gaap_DeferredFinanceCostsNet $ 322us-gaap_DeferredFinanceCostsNet
Accumulated Mt. Hamilton advance royalty payments (1) 900us-gaap_PrepaidRoyalties 600us-gaap_PrepaidRoyalties
Furniture and Fixtures, net of accumulated depreciation 63us-gaap_PropertyPlantAndEquipmentNet 95us-gaap_PropertyPlantAndEquipmentNet
Exploration bonds and other assets 74us-gaap_OtherAssetsMiscellaneousNoncurrent 52us-gaap_OtherAssetsMiscellaneousNoncurrent
Total other assets $ 1,163us-gaap_OtherAssets $ 1,069us-gaap_OtherAssets