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Property and Equipment, net
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property and Equipment, net
Property and Equipment, net
The following table summarizes our major classes of property and equipment (in thousands): 
 
 
December 31,
 
 
2017
 
2016
Laboratory equipment
 
$
8,430

 
$
7,932

Computer equipment and software
 
281

 
265

Furniture and fixtures
 
706

 
706

Leasehold improvements
 
8,550

 
10,469

Construction in progress
 
—

 
261

 
 
17,967

 
19,633

Less accumulated depreciation and amortization
 
(8,259
)
 
(7,803
)
Property and equipment, net
 
$
9,708

 
$
11,830


Depreciation and amortization of property and equipment of $2.4 million, $2.2 million and $1.5 million was recorded for the years ended December 31, 2017, 2016 and 2015, respectively.