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Fair Value of Financial Instruments - Fair Value of Assets and Liabilities by Level (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Assets    
Marketable equity securities Level 1 $ 7,093 $ 10,361
Marketable equity securities Level 2      
Marketable equity securities Level 3      
Marketable equity securities Total 7,093 10,361
Other current assets - Ely warrants Level 1      
Other current assets - Ely warrants Level 2    74
Other current assets - Ely warrants Level 3      
Other current assets - Ely warrants Total    74
Other current assets - ILC warrants Level 1      
Other current assets - ILC warrants Level 2    4
Other current assets - ILC warrants Level 3      
Other current assets - ILC warrants Total    4
Liabilities    
RMB warrants Level 1     
RMB warrants Level 2 1,138  
RMB warrants Level 3     
RMB warrants Total $ 1,138