PRINCIPAL CLIENTS (Details) - USD ($) $ in Thousands			3 Months Ended				9 Months Ended
	Jan. 04, 2014	Jul. 28, 2011	Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015	Sep. 30, 2014
T-Mobile USA, Inc., a subsidiary of Deutsche Telekom
Revenue, Major Customers [Line Items]
Revenue			$ 16,330		$ 19,594		$ 51,453	$ 57,018
Revenue concentration, percentage			22.40%		31.90%		25.70%	30.70%
Initial term of the master service agreement		5 years
Master services agreement, renewal term		1 year
Notice of termination option of the initial term		90 days
AT&T Services, Inc. and AT&T Mobility, LLC, subsidiaries of AT&T Inc.
Revenue, Major Customers [Line Items]
Revenue			$ 7,422	[1]	$ 13,598	[1]	$ 26,232	$ 42,695
Revenue concentration, percentage			10.20%	[1]	22.10%	[1]	13.10%	23.00%
Comcast Cable Communications Management LLC, subsidiary of Comcast Corporation
Revenue, Major Customers [Line Items]
Revenue			$ 7,590	[2]	$ 9,087	[2]	$ 24,399	$ 30,824
Revenue concentration, percentage			10.40%	[2]	14.80%	[2]	12.20%	16.60%
Initial term of the master service agreement	1 year
Master services agreement, renewal term	1 year
Notice of termination option of the initial term	90 days

[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.