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Property and Equipment, net (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
The following table summarizes our major classes of property and equipment (in thousands): 
 
 
December 31,
 
 
2015
 
2014
Laboratory equipment
 
$
7,310

 
$
6,394

Computer equipment and software
 
305

 
266

Furniture and fixtures
 
138

 
119

Leasehold improvements
 
1,930

 
1,899

Construction in progress
 
2,167

 
43

 
 
11,850

 
8,721

Less accumulated depreciation and amortization
 
(6,450
)
 
(5,153
)
Property and equipment, net
 
$
5,400

 
$
3,568