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PRINCIPAL CLIENTS (Tables)
 6 Months Ended
Jun. 30, 2017
Risks and Uncertainties [Abstract]  
Schedule of Revenue by Major Customers
The following table represents revenue concentration of our principal clients:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
Revenue
 
Percentage
 
Revenue
 
Percentage
 
Revenue
 
Percentage
 
Revenue
 
Percentage
T-Mobile
 
$
23,999

 
32.4
%
 
$
17,045

 
23.1
%
 
$
46,053

 
30.4
%
 
$
33,062

 
21.8
%
Sprint
 
$
9,516

 
12.9
%
 
$
11,257

 
15.3
%
 
$
19,771

 
13.0
%
 
$
22,129

 
14.6
%
AT&T
 
$
7,619

 
10.3
%
 
$
9,734

 
13.2
%
 
$
16,266

 
10.7
%
 
$
20,221

 
13.3
%