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

3. Property and Equipment, net

Property and equipment, net consisted of the following (in thousands):

 

            December 31,  
     Estimated Useful
Life Years		      2017     2016  

Laboratory equipment

      4      $ 593     $ 538  

Furniture and fixtures

      5        381       381  

Office and computer equipment

      3        378       371  

Leasehold improvements

      Lesser of useful life or lease term        3,391       3,391  
     

 

 

    

 

 

  
        4,743       4,681  

Less accumulated depreciation and amortization

         (2,558 )      (1,845 ) 
     

 

 

    

 

 

  
      $ 2,185     $ 2,836  
     

 

 

    

 

 

  

 

Depreciation and amortization expense recorded for the years ended December 31, 2017, 2016, and 2015 was $713, $717 and $634, respectively.