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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