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Financial Instruments
 3 Months Ended
Mar. 31, 2013
Financial Instruments [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  

March 31, 2013

                                

Cash

   $ 622,831     $ —       $ —       $ 622,831  

Cash equivalents

     6,608,247       —         —         6,608,247  

Marketable securities, current

     9,818,948       —         (1,439 )      9,817,509  
   

 

 

    

 

 

    

 

 

    

 

 

  

Total cash, cash equivalents, and marketable securities

   $ 17,050,026     $ —       $ (1,439 )    $ 17,048,587  
   

 

 

    

 

 

    

 

 

    

 

 

  

December 31, 2012

                                

Cash

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

Cash equivalents

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

Marketable 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  
   

 

 

    

 

 

    

 

 

    

 

 

  

 

At March 31, 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 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 March 31, 2013 includes approximately 76,000 British pounds held by our U.K. subsidiary.

We do not hold any investments that were in a material unrealized loss position as of March 31, 2013.