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Property and Equipment
9 Months Ended
Sep. 30, 2012
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,
 
2012
 
2011
 
(in thousands)
Computer equipment
$
17,144

 
$
12,483

Computer software
5,913

 
5,720

Furniture, fixtures and equipment
1,438

 
1,330

Scanner appliances
15,894

 
13,394

Leasehold improvements
1,623

 
1,418

Total property and equipment
42,012

 
34,345

Less: accumulated depreciation and amortization
(25,116
)
 
(20,484
)
Property and equipment, net
$
16,896

 
$
13,861



Assets held under capital lease included in computer equipment and software at September 30, 2012 and December 31, 2011 totaled approximately $8,053,000. The related accumulated depreciation at September 30, 2012 and December 31, 2011 totaled $4,558,000 and $3,313,000, respectively. The capital lease obligations are secured by the related equipment and software.

Physical scanner appliances and other computer equipment that are or will be subject to subscriptions by customers have a net carrying value of $4,905,000 and $3,436,000 at September 30, 2012 and December 31, 2011, respectively, including assets that have not been placed in service of $1,170,000 and $210,000, respectively. Other fixed assets not placed in service at September 30, 2012 and December 31, 2011, included in computer equipment and leasehold improvements, relate to new information technology systems and tenant improvements of approximately $1,315,000 and $500,000 respectively. Depreciation and amortization expense relating to property and equipment, including capitalized leases, was $1,739,000 and $1,121,000 for the three months ended September 30, 2012 and 2011, respectively, and $5,066,000 and $3,466,000 for the nine months ended September 30, 2012 and 2011, respectively.