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

Property and equipment are summarized as follows:

 

     Years Ended December 31,  
     2015      2014  

Laboratory equipment

    $ 3,701,517       $ 3,840,368   

Office and computer equipment

      443,562         343,835   

Leasehold improvements

      304,363         50,791   
  

 

 

     

 

 

  

Property and equipment at cost

      4,449,442         4,234,994   

Accumulated depreciation

      (2,286,671 )       (2,182,773 ) 
  

 

 

     

 

 

  

Property and equipment, net

    $ 2,162,771       $ 2,052,221   
  

 

 

     

 

 

  

 

Depreciation expense was $0.3 million and $0.4 million for the years ended December 31, 2015 and 2014, respectively. There were no other changes in accumulated depreciation other than foreign currency impact.