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Marketable Securities
 3 Months Ended
Dec. 31, 2011
Marketable Securities [Abstract]  
MARKETABLE SECURITIES
5. MARKETABLE SECURITIES
Our marketable securities consist of certificates of deposit, commercial paper, corporate bonds and government municipal bonds.
We analyze our available-for-sale marketable securities for impairment on an ongoing basis. We consider factors such as the length of time and extent to which the securities have been in an unrealized loss position and the trend of any unrealized losses. We also consider whether an unrealized loss is a temporary loss or an other-than-temporary loss such as: (a) whether we have the intent to sell the security, (b) whether it is more likely than not that we will be required to sell the security before its anticipated recovery, or (c) permanent impairment due to bankruptcy or insolvency.
In order to estimate the fair value for each security in our investment portfolio, where available, we obtain quoted market prices and trading activity for each security. We also review the financial solvency of each security issuer and obtain other relevant information from our investment advisor. As of December 31, 2011, 59 of our securities were trading below our amortized cost basis. We determined each decline in value to be temporary based upon the above described factors. We expect to realize the fair value of these securities, plus accrued interest, either at the time of maturity or when the security is sold. All of our current holdings are classified as available-for-sale marketable securities and are recorded at fair value on our consolidated balance sheet with the unrealized gains and losses recorded in accumulated other comprehensive loss.
The following was the composition of our marketable securities at December 31, 2011 (in thousands):
                                 
    Amortized     Unrealized     Unrealized        
    Cost (1)     Gains     Losses (2)     Fair Value (1)  
Current marketable securities:
                               
Corporate bonds
  $ 25,220     $ 13     $ (82 )   $ 25,151  
Commercial paper
    2,999       —       (2 )     2,997  
Certificates of deposit
    8,765       —       (8 )     8,757  
Government municipal bonds
    17,231       1       (7 )     17,225  
 
                       
Current marketable securities
    54,215       14       (99 )     54,130  
Non-current marketable securities:
                               
Corporate bonds
    8,263       —       (34 )     8,229  
Certificates of deposit
    250       —       —       250  
Government municipal bonds
    1,032       —       —       1,032  
 
                       
Non-current marketable securities
    9,545       —       (34 )     9,511  
 
                       
Total marketable securities
  $ 63,760     $ 14     $ (133 )   $ 63,641  
 
                       
     
(1)   Included in amortized cost and fair value is purchased and accrued interest of $699.
 
(2)   The aggregate related fair value of securities with unrealized losses as of December 31, 2011 was $49,464.
The following was the composition of our marketable securities at September 30, 2011 (in thousands):
                                 
    Amortized     Unrealized     Unrealized        
    Cost (1)     Gains     Losses (2)     Fair Value (1)  
Current marketable securities:
                               
Corporate bonds
  $ 22,694     $ 18     $ (144 )   $ 22,568  
Commercial paper
    4,998       —       (3 )     4,995  
Certificates of deposit
    8,775       —       (9 )     8,766  
Government municipal bonds
    15,200       3       (8 )     15,195  
 
                       
Current marketable securities
    51,667       21       (164 )     51,524  
Non-current marketable securities:
                               
Corporate bonds
    1,613       —       (10 )     1,603  
 
                       
Total marketable securities
  $ 53,280     $ 21     $ (174 )   $ 53,127  
 
                       
     
(1)   Included in amortized cost and fair value is purchased and accrued interest of $478.
 
(2)   The aggregate related fair value of securities with unrealized losses as of September 30, 2011 was $43,755.