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Fair Value of Financial Instruments - Fair Value - Assets and Liabilities at Fair Value (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Assets |  |
Marketable equity securities Level 1 | $ 3,973,000 | $ 7,093,000
Marketable equity securities Level 2 |  |
Marketable equity securities Level 3 |  |
Marketable equity securities Total | 3,973,000 | 7,093,000
Liabilities |  |
RMB warrants Level 1 |  |
RMB warrants Level 2 | 140,000 | 1,138,000
RMB warrants Level 3 |  |
RMB warrants Total | 140,000 | 1,138,000
Kinross calls Level 1 | 3,000 |
Kinross calls Level 2 |  |
Kinross calls Level 3 |  |
Kinross calls Total | $ 3,000 |

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