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Financial Instruments
 6 Months Ended
Jun. 30, 2013
Investments Debt And Equity Securities [Abstract]  
Financial Instruments

Note 2. Financial Instruments

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
Gains		      Gross
Unrealized
(Losses)		     Fair Value  

June 30, 2013

           

Cash

    $ 251,069       $ —        $ —       $ 251,069   

Cash equivalents

      22,501,826         —          —         22,501,826   

Marketable debt securities, current

      1,425,636         425         —          1,426,061   
  

 

 

     

 

 

     

 

 

    

 

 

  

Total cash, cash equivalents, and marketable securities

    $ 24,178,531       $ 425       $ —        $ 24,178,956   
  

 

 

     

 

 

     

 

 

    

 

 

  

December 31, 2012

           

Cash

    $ 254,268       $ —        $ —       $ 254,268   

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

    $ 22,373,309       $ —        $ (1,356 )    $ 22,371,953   
  

 

 

     

 

 

     

 

 

    

 

 

  

At June 30, 2013, our investment in money market accounts are composed primarily of U.S. Treasury debt securities, which are classified as cash equivalents in the accompanying Consolidated Balance Sheet due to their short maturities. Our investment in short-term marketable securities is composed primarily of commercial paper and corporate debt securities. From time to time, we carry cash balances in excess of federally insured limits. Our cash balance at June 30, 2013 includes approximately $79,000 held by our U.K. subsidiary.