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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2012
Stockholders' Equity [Abstract]  
Stock purchase warrant activity
                 
    Number
Outstanding
    Weighted-Average
Exercise Price per Share
 

Warrants outstanding at December 31, 2011

    15,592,100     $ 3.14  

Expired

    (15,592,100     3.14  
   

 

 

   

 

 

 

Warrants outstanding at June 30, 2012

    —       $ —