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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property and Equipment  
Schedule of property and equipment

 Property and equipment consist of the following (in thousands):

 
   December 31,  
 
   2012   2013  

Property and equipment consist of the following:

              

Computer equipment

   $ 3,399   $ 3,537  

Computer software

     849     1,064  

Research equipment

     5,807     5,918  

Furniture and fixtures

     1,544     1,527  

Leasehold improvements

     1,931     2,047  
           
​ ​ ​ ​ ​ ​ ​ ​

 

     13,530     14,093  

Less accumulated depreciation and amortization

     (8,501 )   (9,973 )
           
​ ​ ​ ​ ​ ​ ​ ​

 

   $ 5,029   $ 4,120  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​