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PRINCIPAL CLIENTS (Tables)
 9 Months Ended
Sep. 30, 2015
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,
 
 
2015
 
2014
 
2015
 
2014
 
 
Revenue
 
Percentage
 
Revenue
 
Percentage
 
Revenue
 
Percentage
 
Revenue
 
Percentage
T-Mobile USA, Inc., a subsidiary of Deutsche Telekom (2)
 
$
16,330

 
22.4
%
 
$
19,594

 
31.9
%
 
$
51,453

 
25.7
%
 
$
57,018

 
30.7
%
AT&T Services, Inc. and AT&T Mobility, LLC, subsidiaries of AT&T, Inc. (1)
 
$
7,422

 
10.2
%
 
$
13,598

 
22.1
%
 
$
26,232

 
13.1
%
 
$
42,695

 
23.0
%
Comcast Cable Communications Management, LLC, subsidiary of Comcast Corporation (2)
 
$
7,590

 
10.4
%
 
$
9,087

 
14.8
%
 
$
24,399

 
12.2
%
 
$
30,824

 
16.6
%
    
(1) Revenue from this customer is generated through our Domestic and Offshore segments.
(2) Revenue from this customer is generated through our Domestic and Offshore segments in 2014 and 2015 and through our Nearshore segment in 2014.