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Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2013
Investments Debt And Equity Securities [Abstract]  
Available for Sale Securities Held in Investment Portfolio

The following table summarizes the fair value of our cash, cash equivalents and available-for-sale marketable securities held in our current investment portfolio:

 

     Amortized
Cost		      Gross
Unrealized
(Losses)		     Fair Value  

September 30, 2013

        

Cash

    $ 377,695       $ —       $ 377,695   

Cash equivalents

      20,577,598         —         20,577,598   
  

 

 

     

 

 

    

 

 

  

Total cash, cash equivalents, and marketable securities

    $ 20,955,293       $ —       $ 20,955,293   
  

 

 

     

 

 

    

 

 

  

December 31, 2012

        

Cash

    $ 254,267       $ —       $ 254,267   

Cash equivalents

      8,217,259         (252 )      8,217,007   

Marketable debt securities, current

      13,901,782         (1,104 )      13,900,678   
  

 

 

     

 

 

    

 

 

  

Total cash, cash equivalents, and marketable securities

    $ 22,373,308       $ (1,356 )    $ 22,371,952