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Fixed assets
12 Months Ended
Dec. 31, 2015
Fixed assets  
Fixed assets

 

4. Fixed assets

        Fixed assets, net were as follows at December 31, 2015 and 2014:

                                                                                                                                                                                    

 

 

December 31,

 

 

 

2015

 

2014

 

Leasehold improvements

 

$

14,029

 

$

13,051

 

Computer equipment and software

 

 

4,102

 

 

2,472

 

Furniture, fixtures, and lab equipment

 

 

17,443

 

 

15,070

 

Assets in process

 

 

1,102

 

 

3,483

 

​  

​  

​  

​  

 

 

 

36,676

 

 

34,076

 

Less accumulated depreciation and amortization

 

 

(27,702

)

 

(24,917

)

​  

​  

​  

​  

 

 

$

8,974

 

$

9,159

 

​  

​  

​  

​  

​  

​  

​  

​  

        Depreciation expense was approximately $2.9 million, $2.2 million, and $2.4 million for the years ended December 31, 2015, 2014 and 2013, respectively.