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Geographic Information (Tables)
 3 Months Ended
Mar. 31, 2017
Segment Reporting [Abstract]  
Schedule of revenue and long-lived assets by geographic region
The following table summarizes revenue by geographic region for the three months ended March 31, 2017 and 2016 (in thousands):
Three months ended March 31:
 
2017
 
% of revenue
 
2016
 
% of revenue
Revenue:
 
 
 
 
 
 
 
 
United States
 
$
11,271

 
53
%
 
$
9,041

 
48
%
Americas (Excluding U.S.)
 
2,403

 
11
%
 
1,290

 
7
%
Europe
 
3,593

 
17
%
 
3,197

 
17
%
Asia Pacific
 
3,908

 
19
%
 
5,354

 
28
%
Total
 
$
21,175

 
100
%
 
$
18,882

 
100
%
The following table summarizes long-lived assets, consisting of property and equipment, by geographic region (in thousands):
 
 
March 31, 2017
 
December 31, 2016
United States
 
$
2,065

 
$
2,336

Europe (1)
 
876

 
782

Asia Pacific
 
11

 
12

Total
 
$
2,952

 
$
3,130