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Investment Securities
3 Months Ended
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Investment Securities

5. Investment Securities

Investment securities, all classified as available-for-sale, consisted of the following (in thousands):

 

     March 31, 2015  
     Amortized
Cost
     Unrealized
Gains
     Unrealized
Losses
     Estimated
Fair
Value
 

U.S. Treasury notes

   $ 2,750       $ —        $ —        $ 2,750   

Government sponsored enterprise securities

     125,660         12         (7      125,665   

Corporate debt securities

     72,068         —          (13      72,055   

Commercial paper

     20,997         2         —          20,999   
  

 

 

    

 

 

    

 

 

    

 

 

 
$ 221,475    $ 14    $ (20 $ 221,469   
  

 

 

    

 

 

    

 

 

    

 

 

 
     December 31, 2014  
     Amortized
Cost
     Unrealized
Gains
     Unrealized
Losses
     Estimated
Fair
Value
 

U.S. Treasury notes

   $ 2,748       $ 2       $ —        $ 2,750   

Government sponsored enterprise securities

     97,237         8         (10      97,235   

Corporate debt securities

     137,682         3         (37      137,648   

Commercial paper

     22,980         19         —          22,999   
  

 

 

    

 

 

    

 

 

    

 

 

 
$ 260,647    $ 32    $ (47 $ 260,632   
  

 

 

    

 

 

    

 

 

    

 

 

 

The Company has classified all of its available-for-sale investment securities as current assets on its consolidated balance sheets. As of March 31, 2015 and December 31, 2014, all of the Company’s available-for-sale investment securities had contractual maturity dates of less than one year.

At each reporting date, the Company performs an evaluation of impairment to determine if the unrealized losses are other-than-temporary. Factors considered in determining whether a loss is other-than-temporary include the length of time and extent to which fair value has been less than the cost basis, the financial condition of the issuer, and the Company’s intent and ability to hold the investment until recovery of its amortized cost basis. The Company intends, and has the ability, to hold its investments in unrealized loss positions until their amortized cost basis has been recovered. Based on its evaluation, the Company determined that its unrealized losses were not other-than-temporary at March 31, 2015 and December 31, 2014.