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Property and Equipment, Net
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property and Equipment, net
NOTE 3.
Property and Equipment, Net

Property and equipment consists of the following:
 
 
December 31,
 
December 31,
 
 
2016
 
2015
 
 
(in thousands)
Computer equipment
 
$
57,295

 
$
48,192

Computer software
 
19,716

 
12,484

Furniture, fixtures and equipment
 
3,425

 
2,804

Scanner appliances
 
14,776

 
22,627

Leasehold improvements
 
3,694

 
3,367

Total property and equipment
 
98,906

 
89,474

Less: accumulated depreciation and amortization
 
(59,505
)
 
(58,145
)
Property and equipment, net
 
$
39,401

 
$
31,329



Physical scanner appliances and other computer equipment that are or will be subject to subscriptions by customers have a net carrying value of $8.3 million and $8.4 million at December 31, 2016 and 2015, respectively, including assets that have not been placed in service of $1.3 million and $1.4 million, respectively. Other fixed assets not placed in service at December 31, 2016 and 2015, included in computer equipment and leasehold improvements, were $3.6 million and $4.3 million, respectively. Depreciation and amortization expense relating to property and equipment was $16.6 million, $13.9 million and $11.5 million for 2016, 2015 and 2014, respectively.