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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2012
Summary of Changes in Fair Value of Level 3 Liabilities

The following table sets forth a summary of changes in the fair value of our Level 3 liabilities for the nine months ended September 30, 2012: 

 

Description   Balance as of
December 31,
2011		   Unrealized (Gains)   Balance as of
September 30, 
2012
                         
Derivative liabilities related to warrants   $ 1,886,652     $ (341,118 )   $ 1,545,534  

 

The following table sets forth a summary of changes in the fair value of our Level 3 liabilities for the nine months ended September 30, 2011: 

 

Description   Balance as of
December 31,
2010		   New
Liabilities
in 2011		   Unrealized (Gains)   Balance as of
September 30, 
2011
                                 
Derivative liabilities
related to warrants		   $ 8,362,995     $ 668,640     $ (6,075,555 )   $ 2,956,080