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PRINCIPAL CLIENTS (Tables)
 9 Months Ended
Sep. 30, 2016
Risks and Uncertainties [Abstract]  
Schedule of Revenue by Major Customers
The following table represents revenue concentration of our principal clients:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2016
 
2015
 
2016
 
2015
 
 
Revenue
 
Percentage
 
Revenue
 
Percentage
 
Revenue
 
Percentage
 
Revenue
 
Percentage
T-Mobile USA, Inc.
 
$
20,298

 
25.9
%
 
$
16,330

 
22.4
%
 
$
53,359

 
23.2
%
 
$
51,453

 
25.7
%
Sprint / United Management Co.
 
$
11,656

 
14.9
%
 
$
10,528

 
14.5
%
 
$
33,785

 
14.7
%
 
$
13,690

 
6.8
%
AT&T Services, Inc. and AT&T Mobility, LLC
 
$
9,194

 
11.7
%
 
$
7,422

 
10.2
%
 
$
29,416

 
12.8
%
 
$
26,232

 
13.1
%
Comcast Cable Communications Management, LLC
 
$
6,549

 
8.4
%
 
$
7,590

 
10.4
%
 
$
20,790

 
9.0
%
 
$
24,399

 
12.2
%