Property and Equipment, Net
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net

6. Property and Equipment, Net

Property and equipment, net consists of the following:

 

     AS OF DECEMBER 31,  
     2015      2014  

Office and computer equipment

    $ 705       $ 503   

Laboratory equipment

      4,161         3,209   

Leasehold improvements

      257         887   

Furniture and fixtures

      477         624   
  

 

 

     

 

 

  

Property and equipment—at cost

      5,600         5,223   

Less accumulated depreciation

      (2,916 )       (3,058 ) 
  

 

 

     

 

 

  

Property and equipment—net

    $ 2,684       $ 2,165   
  

 

 

     

 

 

  

Depreciation expense for the years ended December 31, 2015, 2014 and 2013 was $0.7 million, $0.7 million and, $0.5 million, respectively.