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Other Assets (Tables)
12 Months Ended
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
(in thousands) December 31,
  2014 2013
Deferred offering costs RMB Loan $126  $322 
Accumulated Mt. Hamilton advance royalty payments (1) 900  600 
Furniture and Fixtures, net of accumulated depreciation   63    95 
Exploration bonds and other assets   74    52 
Total other assets $ 1,163  $ 1,069