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Property and Equipment, net
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property and Equipment, net

4.   Property and Equipment, net

Property and equipment, net, consists of the following:

 

     December 31,  
(in thousands)    2017      2016  

Office and computer equipment

    $ 1,215      $ 1,162  

Software

      913        907  

Leasehold improvements

      1,553        1,158  

Research and development equipment

      1,161        878  
  

 

 

     

 

 

  
     4,842        4,105  

Less: accumulated depreciation

      (3,631 )       (3,262 ) 
  

 

 

     

 

 

  

Property and equipment, net

    $ 1,211      $ 843  
  

 

 

     

 

 

  

 

Depreciation charged to the statement of operations for the years ended December 31, 2017, 2016, and 2015 was $369 thousand, $290 thousand and $357 thousand, respectively.