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Convertible Preferred Stock (Details Textual) (Series F Preferred Stock [Member], USD $)
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Series F Preferred Stock [Member]
   
Convertible Preferred Stock (Textual) [Abstract]    
Preferred Stock Convertibles Conversion Ratio 25  
Convertible Preferred Stock price per share $ 25  
Proceeds from sale of convertible preferred stock $ 4,600,000  
Redeemable convertible preferred stock, shares outstanding 12,000 12,000