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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2013
Accounting Policies [Abstract]  
Basic and Dilutive Net Loss Per Share Computations

The following is a reconciliation of the numerators and denominators of the basic and diluted net loss per share computations:

 

     Three months ended September 30,     Nine months ended September 30,  
     2013     2012     2013     2012  

Net loss

   $ (7,191,653   $ (16,336,790   $ (19,476,782   $ (25,732,707

Weighted average shares outstanding used to compute basic and diluted net income or loss per share

     41,402,717        30,168,475        39,787,527        25,992,764   

Basic and diluted net loss per share

   $ (0.17   $ (0.54   $ (0.49   $ (0.99
Outstanding Options, Warrants and Restricted Stock Units

The following outstanding potentially dilutive securities were excluded from the computation of diluted net income or loss per share because the effect would have been anti-dilutive as of September 30:

 

     2013      2012  

Options

     431,558         474,917   

Restricted stock units

     3,336,282         1,516,199   

Warrants

     9,894,909         10,689,083   
  

 

 

    

 

 

 

Total

     13,662,749         12,680,199