v2.4.0.8
Property and Equipment, Net
 9 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net
Property and Equipment, Net

Property and equipment, which includes assets under capital lease, consists of the following:
 
September 30,
 
December 31,
 
2013
 
2012
 
(in thousands)
Computer equipment
$
25,613

 
$
18,798

Computer software
9,139

 
6,327

Furniture, fixtures and equipment
1,758

 
1,545

Scanner appliances
16,646

 
16,470

Leasehold improvements
1,876

 
1,672

Total property and equipment
55,032

 
44,812

Less: accumulated depreciation and amortization
(32,539
)
 
(26,664
)
Property and equipment, net
$
22,493

 
$
18,148



Assets held under capital lease included in computer software at September 30, 2013 and December 31, 2012 totaled approximately $3.8 million. The related accumulated depreciation at September 30, 2013 and December 31, 2012 totaled $1.7 million and $1.2 million, respectively. The capital lease obligations are secured by the related software.

Physical scanner appliances and other computer equipment that are or will be subject to subscriptions by customers have a net carrying value of $4.9 million and $5.5 million at September 30, 2013 and December 31, 2012, respectively, including assets that have not been placed in service of $1.0 million and $1.5 million, respectively. Other fixed assets not placed in service, included in computer equipment and leasehold improvements, relate to new information technology systems and tenant improvements and totaled approximately $1.7 million at September 30, 2013 and December 31, 2012. Depreciation and amortization expense relating to property and equipment, including capitalized leases, was $2.4 million and $1.7 million for three months ended September 30, 2013 and 2012, respectively and $6.7 million and $5.1 million for the nine months ended September 30, 2013 and 2012, respectively.