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Cash Equivalents and Investments (Tables)
12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Fair Value of Cash Equivalents and Available for Sale Investments

The amortized cost and fair value of cash equivalents and available for sale investments at December 31, 2014 and 2013 were as follows (in thousands):

 

     December 31, 2014  
     Amortized
Cost
     Unrealized
Gains
     Unrealized
Losses
    Fair
Value
     Maturity
Dates
 

Cash equivalents — money market funds

   $ 16,932       $       $      $ 16,932      
  

 

 

    

 

 

    

 

 

   

 

 

    

Short-term investments — U.S. Treasury securities

   $ 63,017       $ 3       $ (7   $ 63,013         1/2015 — 12/2015   
  

 

 

    

 

 

    

 

 

   

 

 

    

Long-term investments — U.S. Treasury securities

   $       $       $      $      
  

 

 

    

 

 

    

 

 

   

 

 

    

 

     December 31, 2013  
     Amortized
Cost
     Unrealized
Gains
     Unrealized
Losses
    Fair
Value
     Maturity
Dates
 

Cash equivalents — money market funds

   $ 15,858       $       $      $ 15,858      
  

 

 

    

 

 

    

 

 

   

 

 

    

Short-term investments — U.S. Treasury securities

   $ 57,564       $ 7       $ (1   $ 57,570         1/2014 — 12/2014   
  

 

 

    

 

 

    

 

 

   

 

 

    

Long-term investments — U.S. Treasury securities

   $ 2,502       $       $      $ 2,502         1/2015   
  

 

 

    

 

 

    

 

 

   

 

 

    
Summary of Interest Income

Interest income was as follows (in thousands):

 

     Years Ended
December 31,
 
     2014      2013      2012  

Interest income

   $ 101       $ 96       $ 83