v3.3.1.900
Property and Equipment, Net
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property and Equipment, net
NOTE 3.
Property and Equipment, Net

Property and equipment consists of the following:
 
 
December 31,
 
 
2015
 
2014
 
 
(in thousands)
Computer equipment
 
$
48,192

 
$
35,576

Computer software
 
12,484

 
10,899

Furniture, fixtures and equipment
 
2,804

 
2,931

Scanner appliances
 
22,627

 
19,861

Leasehold improvements
 
3,367

 
2,622

Total property and equipment
 
89,474

 
71,889

Less: accumulated depreciation and amortization
 
(58,145
)
 
(45,271
)
Property and equipment, net
 
$
31,329

 
$
26,618



Physical scanner appliances and other computer equipment that are or will be subject to subscriptions by customers have a net carrying value of $8.4 million and $6.0 million at December 31, 2015 and 2014, respectively, including assets that have not been placed in service of $1.4 million and $1.4 million, respectively. Other fixed assets not placed in service at December 31, 2015 and 2014, included in computer equipment and leasehold improvements, were $4.3 million and $2.8 million, respectively. Depreciation and amortization expense relating to property and equipment was $13.9 million, $11.5 million and $9.2 million for 2015, 2014 and 2013, respectively.