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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues $ 0 $ 0 $ 0 $ 0
Operating expense:        
Corporate administration (888) (775) (2,311) (1,796)
Depreciation and amortization (12) (149) (240) (318)
Gain on disposal of mineral property, net (Note 4)       358
Total operating expense (1,955) (2,232) (5,151) (4,816)
Non-operating income/(expenses):        
Gain/(loss) on other investments (Note 3)   (468) 2,028 (780)
Interest income 68 29 250 79
Other income/(expense) (36) (11) 2 (12)
Total non-operating income/(expense) 32 (450) 2,280 (713)
Net loss (1,923) (2,682) (2,871) (5,529)
Other comprehensive loss:        
Unrealized fair value decrease on available-for-sale securities   (15)   (21)
Comprehensive loss $ (1,923) $ (2,697) $ (2,871) $ (5,550)
Basic:        
Weighted average number of shares outstanding (in shares) 99,547,531 98,196,308 99,496,641 98,045,484
Net loss per share, Basic (in dollars per share) $ (0.02) $ (0.03) $ (0.03) $ (0.06)
Diluted:        
Weighted average number of shares outstanding (in shares) 99,547,531 98,196,308 99,496,641 98,045,484
Net loss per share, Diluted (in dollars per share) $ (0.02) $ (0.03) $ (0.03) $ (0.06)
Mineral, Exploration [Member]        
Operating expense:        
Exploration, property evaluation and holding costs $ (1,055) $ (1,308) $ (2,600) $ (3,060)