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Geographic Information (Tables)
 12 Months Ended
Dec. 31, 2016
Segment Reporting [Abstract]  
External revenue and long-lived assets by geographical region
The following table summarizes long-lived assets, consisting of property and equipment, by geographic region (in thousands):
December 31:
 
2016
 
2015
United States
 
$
2,336

 
$
2,808

Americas (Excluding the U.S.)
 
—

 
—

Europe 1
 
782

 
1,223

Asia Pacific
 
12

 
19

Total
 
$
3,130

 
$
4,050


(1) Includes Long-lived Assets held in Israel of $0.8 million and $1.2 million as December 31, 2015 and 2016, respectively.
The following table summarizes external revenue by geographic region (in thousands):
Year Ended December 31:
 
2016
 
% of revenue
 
2015
 
% of revenue
 
2014
 
% of revenue
United States
 
$
39,727

 
49
%
 
$
42,933

 
49
%
 
$
51,036

 
59
%
Americas (Excluding the U.S.)
 
8,250

 
10
%
 
6,828

 
8
%
 
1,507

 
2
%
Europe
 
14,531

 
18
%
 
19,463

 
22
%
 
20,478

 
24
%
Asia Pacific
 
17,807

 
23
%
 
18,975

 
21
%
 
13,517

 
15
%
Total
 
$
80,315

 
100
%
 
$
88,199

 
100
%
 
$
86,538

 
100
%