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Property and Equipment, Net (Tables)
 9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Property and equipment, net
Property and equipment consists of the following:
                                                                                              
 
September 30,
 
December 31,
 
2017
 
2016
 
(in thousands)
Computer equipment
$
70,158

 
$
57,295

Computer software
20,254

 
19,716

Furniture, fixtures and equipment
4,025

 
3,425

Scanner appliances
14,419

 
14,776

Leasehold improvements
15,538

 
3,694

Total property and equipment
124,394

 
98,906

Less: accumulated depreciation and amortization
(73,113
)
 
(59,505
)
Property and equipment, net
$
51,281

 
$
39,401