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Property and Equipment, net
3 Months Ended
Mar. 31, 2013
Property and Equipment, net [Abstract]  
Property and Equipment, net

5. Property and Equipment, net

Property and equipment was comprised of the following as of March 31, 2013 and December 31, 2012 (in thousands):

 

                 
    March 31,
2013
    December 31,
2012
 

Property and equipment—at cost:

               

Plant and machinery

  $ 3,223     $ 3,059  

Instruments

    6,105       5,795  

Office equipment

    1,140       1,047  

Leasehold improvements

    3,085       2,973  
   

 

 

   

 

 

 

Total property and equipment—at cost

    13,553       12,874  

Less accumulated depreciation

    (6,206     (5,800
   

 

 

   

 

 

 

Property and equipment, net

  $ 7,347     $ 7,074  
   

 

 

   

 

 

 

Depreciation expense was $416,000 and $224,000 for the three months ended March 31, 2013 and 2012, respectively.