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Fair Value Measurement of Assets and Liabilities (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value Disclosures [Abstract]  
Fair value assumptions and methodology for assets and liabilities
 
 
 
    For the Six  
   
Months Ended
June 30, 2011
 
       
Annual dividend yield
   
--
 
Expected life (years)
   
0.08 – 3.0
 
Risk-free interest rate
   
0.08%- 1.27%
 
Expected volatility
   
110% - 263%