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UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY - 6 months ended Jun. 30, 2016 - USD ($)
$ in Thousands
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income [Member]
Total
Balances at beginning at Dec. 31, 2015   $ 47 $ 125,133 $ (109,705) $ 15,475
Balances at beginning (in shares) at Dec. 31, 2015 4,699,956        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Issuance of common stock upon vesting of restricted common stock, net
Issuance of common stock upon vesting of restricted common stock, net (in shares) 5,556        
Stock-based compensation 68 68
Issuance of Series A Convertible Preferred Stock in disposition of mining segment $ 1 1,999 2,000
Issuance of Series A Convertible Preferred Stock in disposition of mining segment (in shares) 50,000        
Cash payment for fractional shares in reverse stock split (3) (3)
Cash payment for fractional shares in reverse stock split (in shares) (1,245)        
Unrealized gain on marketable equity securities 927 927
Net loss     (14,818) (14,818)
Balances at end at Jun. 30, 2016 $ 1 $ 47 $ 127,197 $ (124,523) $ 927 $ 3,649
Balances at end (in shares) at Jun. 30, 2016 50,000 4,704,267