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Other Assets (Tables)
12 Months Ended
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
(in thousands) December 31,
  2018 2017
Furniture and fixtures, net of accumulated depreciation   $   36    $   31 
Lik project equipment, net of accumulated depreciation 70   90 
Exploration bonds and other assets   4    4 
Total other assets $110  $125