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Cash, cash equivalents and marketable securities (Tables)
6 Months Ended
Jun. 30, 2013
Summary of Cash, Cash Equivalents and Marketable Securities Available-for-sale

The following is a summary of cash, cash equivalents and marketable securities available-for-sale as of June 30, 2013 and December 31, 2012 (in thousands):

 

    Amortized Cost     Unrealized Gains     Unrealized Losses     Estimated Fair Value  

June 30, 2013

       

Cash and cash equivalents:

       

Cash

  $ 2,068      $ —        $ —        $ 2,068   

Money market funds

    15,142        —          —          15,142   

Municipal securities

    375        —          —          375   
 

 

 

   

 

 

   

 

 

   

 

 

 

Total cash and cash equivalents

    17,585        —          —          17,585   
 

 

 

   

 

 

   

 

 

   

 

 

 

Marketable securities available-for-sale:

       

U.S. treasury securities

    2,499        1        —          2,500   

U.S. government agency securities

    69,073        12        (9     69,076   
 

 

 

   

 

 

   

 

 

   

 

 

 

Total marketable securities available-for-sale

    71,572        13        (9     71,576   
 

 

 

   

 

 

   

 

 

   

 

 

 

Total cash, cash equivalents and marketable securities

  $ 89,157      $ 13      $ (9   $ 89,161   
 

 

 

   

 

 

   

 

 

   

 

 

 

December 31, 2012

       

Cash and cash equivalents:

       

Cash

  $ 1,542      $ —        $ —        $ 1,542   

Money market funds

    3,140        —          —          3,140   

Municipal securities

    2,202        —          —          2,202   

U.S. government agency securities

    715        —          —          715   
 

 

 

   

 

 

   

 

 

   

 

 

 

Total cash and cash equivalents

    7,599        —          —          7,599   
 

 

 

   

 

 

   

 

 

   

 

 

 

Marketable securities available-for-sale:

       

U.S. government agency securities

    116,986        46        (1     117,031   

U.S. treasury securities

    500        —          —          500   
 

 

 

   

 

 

   

 

 

   

 

 

 

Total marketable securities available-for-sale

    117,486        46        (1     117,531   
 

 

 

   

 

 

   

 

 

   

 

 

 

Total cash, cash equivalents and marketable securities

  $ 125,085      $ 46      $ (1   $ 125,130   
 

 

 

   

 

 

   

 

 

   

 

 

 
Summary of Amortized Cost and Estimated Fair Value of Marketable Securities Available-for-sale

The following is a summary of the amortized cost and estimated fair value of marketable securities available-for-sale at June 30, 2013, by contractual maturity (in thousands):

 

     June 30, 2013  
     Amortized
Cost
     Estimated Fair
Value
 

Mature in one year or less

   $ 54,029       $ 54,034   

Mature after one year through two years

     17,543         17,542   
  

 

 

    

 

 

 
   $ 71,572       $ 71,576