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Fair value measurement (Tables)
 12 Months Ended
Dec. 31, 2013
Fair value measurement  
Schedule of financial assets that are measured at fair value on a recurring basis

 

 

At December 31, 2013
  Level 1   Level 2   Level 3   Total  

Assets:

                          

Cash equivalents

   $ 23,683   $ —   $ —   $ 23,683  

Marketable securities

     —     32,962     —     32,962  

Restricted cash

     545     —     —     545  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total assets

   $ 24,228   $ 32,962   $ —   $ 57,190  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Liabilities:

                          

Contingent consideration

   $ —   $ —   $ 1,942   $ 1,942  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total liabilities

   $ —   $ —   $ 1,942   $ 1,942  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   


 

At December 31, 2012
  Level 1   Level 2   Total  

Assets:

                    

Cash equivalents

   $ 39,001   $ 2,460   $ 41,461  

Marketable securities

     —     41,558     41,558  

Restricted cash

     30     —     30  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total assets

   $ 39,031   $ 44,018   $ 83,049  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               
Schedule of reconciliation of the beginning and ending amounts related to the fair value of contingent consideration for the Endeka and AWG acquisitions, categorized as Level 3

 

 

Beginning balance, January 1, 2013

   $ —  

Contingent consideration for acquisition of businesses

     2,309  

Change in fair value

     (367 )
       
​ ​ ​ ​ ​

Balance, December 31, 2013

   $ 1,942  
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​