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Property and Equipment
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property and Equipment

5. PROPERTY AND EQUIPMENT

Property and equipment consist of the following:

 

     December 31,  
     2016      2015  
     (in thousands)  

Laboratory equipment

   $ 5,487       $ 4,471   

Office equipment and furniture

     824         134   

Leasehold improvements

     7,783         3,914   
  

 

 

    

 

 

 

Property and equipment, gross

     14,094         8,519   

Less: accumulated depreciation

     (5,103      (3,808
  

 

 

    

 

 

 

Total property and equipment, net

   $ 8,991       $ 4,711   
  

 

 

    

 

 

 

Depreciation expense totaled $1.3 million, $0.8 million and $0.3 million for the years ended December 31, 2016, 2015 and 2014.