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Segments (Tables)
 12 Months Ended
Dec. 31, 2014
Schedule of Geographic Revenue [Abstract]  
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]
The following geographic information is presented for the years ended December 31, 2014, 2013 and 2012. The Company categorizes geographic revenues based on the location of the customer’s headquarters.
 
Year Ended December 31,
 
2014
 
2013
 
2012
 
Revenue
 
Percent
 
Revenue
 
Percent
 
Revenue
 
Percent
The Americas:
 
 
 
 
 
 
 
 
 
 
 
United States of America
$
82,086

 
44
%
 
$
65,072

 
45
%
 
$
51,631

 
44
%
Other
15,365

 
8
%
 
12,222

 
8
%
 
5,457

 
5
%
Subtotal
97,451

 
52
%
 
77,294

 
54
%
 
57,088

 
49
%
Europe
45,987

 
25
%
 
33,666

 
23
%
 
31,545

 
27
%
Asia Pacific
34,170

 
18
%
 
22,411

 
15
%
 
15,356

 
13
%
The Middle East
6,239

 
3
%
 
9,840

 
7
%
 
10,914

 
9
%
Africa
1,982

 
1
%
 
1,626

 
1
%
 
2,888

 
2
%
Total revenue
$
185,829

 
100
%
 
$
144,837

 
100
%
 
$
117,791

 
100
%