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Segment and Geographical Information (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018, 2017 and 2016. The Company categorizes geographic revenues based on the location of the customer’s headquarters.
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
Revenue
 
Percent
 
Revenue
 
Percent
 
Revenue
 
Percent
The Americas:
 
 
 
 
 
 
 
 
 
 
 
United States of America
$
68,482

 
35
%
 
$
63,097

 
37
%
 
$
56,774

 
37
%
Other
18,378

 
9
%
 
13,645

 
8
%
 
9,335

 
6
%
Subtotal
86,860

 
44
%
 
76,742

 
45
%
 
66,109

 
43
%
Germany
20,171

 
10
%
 
17,421

 
10
%
 
10,042

 
7
%
The Rest of Europe
40,776

 
21
%
 
33,852

 
20
%
 
34,613

 
23
%
Asia Pacific
32,090

 
16
%
 
26,528

 
16
%
 
30,457

 
20
%
The Middle East
15,092

 
8
%
 
11,437

 
7
%
 
10,567

 
7
%
Africa
2,035

 
1
%
 
2,836

 
2
%
 
1,488

 
1
%
Total revenue
$
197,024

 
100
%
 
$
168,816

 
100
%
 
$
153,276

 
100
%