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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 |

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