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Cash Equivalents and Investments (Tables)
12 Months Ended
Dec. 31, 2016
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, 2016 and 2015 were as follows (in thousands):

 

    December 31, 2016  
    Amortized
Cost
    Unrealized
Gains
    Unrealized
Losses
    Fair
Value
    Maturity
Dates
 

Cash equivalents — U. S. Treasury securities and money market funds

  $ 55,658     $     $     $ 55,658    
 

 

 

   

 

 

   

 

 

   

 

 

   

Short-term investments — U.S. Treasury securities

  $ 89,396     $ 2     $ (23   $ 89,375       1/2017 — 12/2017  
 

 

 

   

 

 

   

 

 

   

 

 

   

Long-term investments — Equity and U.S. Treasury securities

  $ 7,513     $ 176     $ (17   $ 7,672       2/2018 — 3/2018  
   

 

 

   

 

 

   

 

 

   

 

 

         

 

    December 31, 2015  
    Amortized
Cost
    Unrealized
Gains
    Unrealized
Losses
    Fair
Value
    Maturity
Dates
 

Cash equivalents — money market funds

  $ 63,136     $     $     $ 63,136    
 

 

 

   

 

 

   

 

 

   

 

 

   

Short-term investments — U.S. Treasury securities

  $ 46,395     $ 1     $ (30   $ 46,366       2/2016 —8/2016  
 

 

 

   

 

 

   

 

 

   

 

 

   

Long-term investments — equity securities

  $     $ 179     $     $ 179    
   

 

 

   

 

 

   

 

 

   

 

 

         

Summary of Interest Income

Interest income was as follows (in thousands):

 

     Years Ended
December 31,
 
     2016      2015      2014  

Interest income

   $ 449      $ 156      $ 101