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Fair Value - Fair Value June 30 2013 (Details) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets |  |
Marketable equity securities Level 1 | $ 4,022,000 | $ 7,093,000
Marketable equity securities Level 2 |  |
Marketable equity securities Level 3 |  |
Marketable equity securities Total | 4,022,000 | 7,093,000
Liabilities |  |
RMB warrants Level 1 |  |
RMB warrants Level 2 | 282,000 | 1,138,000
RMB warrants Level 3 |  |
RMB warrants Total | $ 282,000 | $ 1,138,000

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