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GEOGRAPHIC AND OPERATING SEGMENT INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Summary of revenue by geographic area as a percentage of total revenue
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
%
Schedule of revenue by type
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