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Segment and Geographic Information
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Segment and Geographic Information
SEGMENT AND GEOGRAPHIC INFORMATION
The Company’s management has determined that the Company operates in one segment as it only reports financial information on an aggregate and consolidated basis to its chief executive officer, who is the chief operating decision maker. The Company presents its entity-wide information in the tables below.
The following table sets forth the Company’s sources of revenue (dollars in thousands): 
 
At or For Year Ended December 31,
 
2017
 
2016
 
2015
Subscription revenue
$
396,764

 
$
339,756

 
$
270,093

Percentage of subscription revenue to total revenue
82.3
%
 
80.3
%
 
79.5
%
Professional services revenue
$
85,221

 
$
83,368

 
$
69,558

Percentage of professional services revenue to total revenue
17.7
%
 
19.7
%
 
20.5
%
 
$
481,985

 
$
423,124

 
$
339,651


Revenue by geographic region, which is generally based on the address of the Company’s clients as defined in their master subscription agreements, is set forth below (in thousands):
 
 
Years Ended December 31,
 
2017
 
2016
 
2015
Revenue
 
 
 
 
 
United States
$
313,729

 
$
284,657

 
$
228,724

United Kingdom
25,701

 
27,571

 
30,104

All other countries
142,555

 
110,896

 
80,823

Total revenue
$
481,985

 
$
423,124

 
$
339,651


Property and equipment by region is set forth below (in thousands):
 
 
 
December 31,
 
 
2017
 
2016
Property and equipment, net
 
 
 
 
United States
 
$
16,468

 
$
19,843

United Kingdom
 
3,378

 
2,985

All other countries
 
971

 
1,134

Total property and equipment, net
 
$
20,817

 
$
23,962