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Fixed assets
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Fixed assets
Fixed assets
Fixed assets, net were as follows at December 31, 2016 and 2015:
 
 
December 31,
 
 
2016
 
2015
Leasehold improvements
 
$
14,038

 
$
14,029

Computer equipment and software
 
4,622

 
4,102

Furniture, fixtures, and lab equipment
 
19,343

 
17,443

Assets in process
 
353

 
1,102

 
 
38,356

 
36,676

Less accumulated depreciation and amortization
 
(30,927
)
 
(27,702
)
 
 
$
7,429

 
$
8,974


Depreciation expense was approximately $3.3 million, $2.9 million, and $2.2 million for the years ended December 31, 2016, 2015 and 2014, respectively.