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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