PRINCIPAL CLIENTS (Details) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended
	Aug. 09, 2016	Jun. 22, 2013	Jul. 02, 2011	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenue, Major Customers [Line Items]
Receivables Sold Under Factoring Agreements				$ 14,584	$ 6,055
T-Mobile USA, Inc.
Revenue, Major Customers [Line Items]
Revenue				$ 20,298	$ 16,330	$ 53,359	$ 51,453
Revenue concentration, percentage				25.90%	22.40%	23.20%	25.70%
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
Sprint / United Management Co. [Member]
Revenue, Major Customers [Line Items]
Revenue				$ 11,656	$ 10,528	$ 33,785	$ 13,690
Revenue concentration, percentage				14.90%	14.50%	14.70%	6.80%
Initial term of the master service agreement			3 years
Master services agreement, renewal term			1 month
Notice of termination option of the initial term			30 days
AT&T Services, Inc. and AT&T Mobility, LLC
Revenue, Major Customers [Line Items]
Revenue				$ 9,194	$ 7,422	$ 29,416	$ 26,232
Revenue concentration, percentage				11.70%	10.20%	12.80%	13.10%
Initial term of the master service agreement	3 years
Comcast Cable Communications Management LLC
Revenue, Major Customers [Line Items]
Revenue				$ 6,549	$ 7,590	$ 20,790	$ 24,399
Revenue concentration, percentage				8.40%	10.40%	9.00%	12.20%
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