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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property and Equipment

Property and equipment consisted of the following at December 31 (in thousands):

 

     Useful Life
(Years)		    2015      2014  

Manufacturing equipment

    5    $ 4,543      $ 3,654  

Lease and loaner instruments

    1 -5      3,318        2,629  

Prototype instruments

    2      2,956        2,157  

Computer equipment

    3      1,847        1,430  

Furniture and fixtures

    5      1,390        831  

Leasehold improvements

    Various      5,874        4,888  

Construction in progress

         1,921         1,058   
     

 

 

     

 

 

  
        21,849        16,647  

Less: Accumulated depreciation and amortization

         (12,435 )       (10,281 ) 
     

 

 

     

 

 

  
      $ 9,414      $ 6,366