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Warrants (Tables)
12 Months Ended
Dec. 31, 2012
Warrants [Abstract]  
Warrants to purchase common stock issued and outstanding
                             

Year Issued

  Classification     Number of
Warrants
    Exercise
Price
    Date of Expiration

2010

    Derivative       13,387,994     $ 1.40     10/26/2015-12/3/2015

2010

    Derivative       1,940,157     $ 1.00     9/26/2015-12/3/2015

2011

    Equity       16,071     $ 1.40     6/17/2018

2011

    Equity       343,137     $ 3.06     12/21/2016

2012

    Equity       36,145     $ 1.66     10/5/2019
           

 

 

             

Total

            15,723,504              
           

 

 

             

Weighted average exercise price

                  $ 1.36      
                   

 

 

     

Weighted average life in years

                          2.9