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Financial Instruments
 12 Months Ended
Dec. 31, 2012
Financial Instruments [Abstract]  
Financial Instruments

Note 2. Financial Instruments

Cash, cash equivalents and marketable securities

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

 

                                 
    Amortized
Cost		     Gross
Unrealized
Gains		     Gross
Unrealized
Losses		     Fair Value  

December 31, 2012

                                

Cash

   $ 254,267     $ —       $ —       $ 254,267  

Cash equivalents (money market accounts)

     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  
   

 

 

    

 

 

    

 

 

    

 

 

  

December 31, 2011

                                

Cash

   $ 291,093     $ —       $ —       $ 291,093  

Cash equivalents (money market accounts)

     13,020,168       —         —         13,020,168  

Marketable equity securities, current

     3,283,209       —         (2,618 )      3,280,591  
   

 

 

    

 

 

    

 

 

    

 

 

  

Total cash, cash equivalents, and marketable securities

   $ 16,594,470     $ —       $ (2,618 )    $ 16,591,852  
   

 

 

    

 

 

    

 

 

    

 

 

  

At December 31, 2012, 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 debt securities are 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 December 31, 2012 includes approximately $22,000 held in British pounds by our U.K. subsidiary.

We do not hold any investments that were in a material unrealized loss position as of December 31, 2012.