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Redeemable Convertible Preferred Stock (Details) (Fair Value, Inputs, Level 3 [Member])
3 Months Ended
Mar. 31, 2013
Fair Value, Inputs, Level 3 [Member]
 
Expected life of the redemption in years 1 year
Risk free interest rate 0.14%
Expected annual volatility 139.42%
Annual rate of dividends 0.00%