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Warrant Liability (Details 2) (Series A Warrant [Member])
6 Months Ended
Jun. 30, 2012
Series A Warrant [Member]
 
Assumptions used for simulation model  
Risk-free interest rate per year 0.60%
Expected volatility per year 86.60%
Expected dividend yield 0.00%
Expected life (years) 4 years 6 months