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Property and Equipment (Tables)
 9 Months Ended
Sep. 30, 2013
Property Plant And Equipment [Abstract]  
Property and Equipment

Property and equipment consisted of the following at December 31:

 

     Useful Life
(Years)		    2011     2012  
     (In thousands)  

Manufacturing equipment

    5    $ 2,481      $ 2,854   

Prototype systems

    2      1,939        1,893   

Computer equipment

    3      571        651   

Furniture and fixtures

    5      507        517   

Leasehold improvements

    Various      4,713        4,713   

Construction in progress

         59        14   
     

 

 

    

 

 

  
        10,270        10,642   

Less: Accumulated depreciation and amortization

         (5,074 )      (6,968 ) 
     

 

 

    

 

 

  
      $ 5,196      $ 3,674