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Derivative Instruments - Fair value derivative instruments (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
RMB warrants (long-term liabilities) $ 55,000us-gaap_DerivativeFairValueOfDerivativeLiability $ 140,000us-gaap_DerivativeFairValueOfDerivativeLiability
Kinross calls (other current liabilities)    $ 3,000us-gaap_HedgingLiabilitiesCurrent