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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 |  |  |  |

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