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15. FAIR VALUE MEASUREMENTS (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Derivative liabilities - warrant instruments      
Quoted Prices in Active Markets for Identical Assets (Level 1)
   
Derivative liabilities - warrant instruments     
Significant Other Observable Inputs (Level 2)
   
Derivative liabilities - warrant instruments     
Significant Unobservable Inputs (Level 3)
   
Derivative liabilities - warrant instruments