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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues $ 0 $ 0
Operating expense:    
Corporate administration (1,423) (1,021)
Depreciation and amortization (228) (169)
Gain on disposal of mineral property, net (Note 4)   358
Total operating expense (3,196) (2,584)
Non-operating income/(expenses):    
Gain/(loss) on other investments (Note 3) 2,028 (312)
Interest income 182 50
Other income/(expense) 38 (1)
Total non-operating income/(expense) 2,248 (263)
Net loss (948) (2,847)
Other comprehensive loss:    
Unrealized fair value decrease on available-for-sale securities   (6)
Comprehensive loss $ (948) $ (2,853)
Basic:    
Weighted average number of shares outstanding (in shares) 99,445,750 97,894,661
Net loss per share, Basic (in dollars per share) $ (0.01) $ (0.03)
Diluted:    
Weighted average number of shares outstanding (in shares) 99,445,750 97,894,661
Net loss per share, Diluted (in dollars per share) $ (0.01) $ (0.03)
Mineral, Exploration [Member]    
Operating expense:    
Exploration, property evaluation and holding costs $ (1,545) $ (1,752)