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Short-Term Investments (Tables)
3 Months Ended
Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]  
Available-for-Sale Securities Recorded at Fair Value with Unrealized Gains or Losses

Available-for-sale securities with contractual maturities of less than 12 months were as follows (in thousands):

 

     March 31, 2015      December 31, 2014  
     Amortized      Gross unrealized             Amortized      Gross unrealized        
     cost basis      gain(loss)      Fair value      cost basis      gain(loss)     Fair value  

Corporate notes, bonds and paper

   $ —         $ —         $ —         $ 1,000       $ (1   $ 999   

Government securities/money market

     3,800         —           3,800         1,881         —          1,881   
  

 

 

    

 

 

    

 

 

    

 

 

    

 

 

   

 

 

 

Total

$ 3,800    $ —      $ 3,800    $ 2,881    $ (1 $ 2,880