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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2012
Stockholders' Equity [Abstract]  
Schedule of Warrant Related Activity

The following summarizes warrant activity during the nine months ended September 30, 2012:

 

   

Warrant Shares

   

Weighted Average
Exercise Price

 
Warrants outstanding, December 31, 2011     6,261,978     $ 3.82  
Warrants issued     6,809,705       0.52  
Warrants expired     (1,380,597 )     1.34  
Warrants exercised     (440,000 )     0.51  
Warrants outstanding, September 30, 2012     11,251,086     $ 2.26