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Derivative Instruments - Derivative Instruments Summary RMB Warrants Table 2 (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |  |
(Gain) loss on warrant liability | $ (96,000) | $ 729,000 | $ (953,000) | $ 729,000
Black Scholes model |  |  |  |
Life (months) |  |  | 23 | 35
Stock price per share |  |  | 0.86 | 1.85
Volatility (%) |  |  | 57 | 65
Risk-free interest rate (%) |  |  | 0.3 | 0.4

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