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GEOGRAPHIC AND OPERATING SEGMENT INFORMATION
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
GEOGRAPHIC INFORMATION
GEOGRAPHIC AND SEGMENT INFORMATION

The Company's classification of revenue by geographic area is determined by the location of the Company's customers. The following table summarizes revenue by geographic area as a percentage of total revenue:
 
Year ended December 31,
 
2017
 
2016
 
2015
United States
66
%
 
69
%
 
71
%
Europe, Middle East and Africa
14

 
13

 
13

Japan
7

 
10

 
10

Other Asia Pacific
7

 
5

 
4

Other
6

 
3

 
2

 
100
%
 
100
%
 
100
%

 
 
 
 
 
 
The Company's service revenue is comprised of the following (in thousands):
 
Year ended December 31,
 
2017
 
2016
 
2015
Maintenance
$
114,735

 
$
86,995

 
$
89,280

Professional services
34,088

 
19,215

 
17,841

 
$
148,823

 
$
106,210

 
$
107,121