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Cash, Cash Equivalents and Marketable Securities (Tables)
9 Months Ended
Sep. 30, 2013
Investments in Debt Securities

Investments in debt securities consisted of the following at September 30, 2013:

 

     September 30, 2013  
     Amortized
Cost
     Gross
Unrealized
Gain
     Gross
Unrealized
Loss
    Fair Value  

Marketable securities:

          

U.S. Government and agency securities

   $ 1,567,499       $ 313       $ (335   $ 1,567,477   

Corporate and other debt securities

     19,171,567         9,977         (2,531     19,179,013   
  

 

 

    

 

 

    

 

 

   

 

 

 
     20,739,066         10,290         (2,866     20,746,490   

Long-term marketable securities:

          

U.S. Government and agency securities

     4,112,079         2,436         (65     4,114,450   

Corporate and other debt securities

     —           —           —          —     
  

 

 

    

 

 

    

 

 

   

 

 

 
     4,112,079         2,436         (65     4,114,450   
  

 

 

    

 

 

    

 

 

   

 

 

 

Total

   $ 24,851,145       $ 12,726       $ (2,931   $ 24,860,940   
  

 

 

    

 

 

    

 

 

   

 

 

 

 

 

 

Investments in debt securities consisted of the following at December 31, 2012:

 

     December 31, 2012  
     Amortized
Cost
     Gross
Unrealized
Gain
     Gross
Unrealized
Loss
    Fair Value  

Marketable securities:

          

U.S. Government and agency securities

   $ 2,000,897       $ 353       $ (7   $ 2,001,243   

Corporate and other debt securities

     8,835,098         8,854         —          8,843,952   
  

 

 

    

 

 

    

 

 

   

 

 

 
     10,835,995         9,207         (7     10,845,195   

Long-term marketable securities:

          

U.S. Government and agency securities

     5,198,264         2,747         —          5,201,011   

Corporate and other debt securities

     4,711,679         3,525         (1,360     4,713,844   
  

 

 

    

 

 

    

 

 

   

 

 

 
     9,909,943         6,272         (1,360     9,914,855   
  

 

 

    

 

 

    

 

 

   

 

 

 

Total

   $ 20,745,938       $ 15,479       $ (1,367   $ 20,760,050   
  

 

 

    

 

 

    

 

 

   

 

 

 
Contractual Maturities of Debt Securities

The contractual maturities of debt securities at September 30, 2013 were as follows:

 

     Amortized
Cost
     Fair Value  

Due in 1 year or less

   $ 20,739,066       $ 20,746,490   

Due in 1 to 2 years

     4,112,079         4,114,450   
  

 

 

    

 

 

 
   $ 24,851,145       $ 24,860,940