GEOGRAPHIC INFORMATION (Information by Geographic Area Revenues) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Service revenues	$ 15,368	$ 14,198	$ 42,146	$ 41,774
Subscriber Equipment Revenue	5,169	3,989	15,110	13,666
Total revenue	20,537	18,187	57,256	55,440
UNITED STATES
Segment Reporting Information [Line Items]
Service revenues	11,051	9,291	29,926	27,282
Subscriber Equipment Revenue	3,633	2,633	10,724	8,695
CANADA
Segment Reporting Information [Line Items]
Service revenues	2,836	2,813	7,827	8,217
Subscriber Equipment Revenue	887	924	2,555	2,657
Europe [Member]
Segment Reporting Information [Line Items]
Service revenues	732	1,186	2,223	3,238
Subscriber Equipment Revenue	287	220	939	1,137
Central And South America [Member]
Segment Reporting Information [Line Items]
Service revenues	640	828	1,897	2,780
Subscriber Equipment Revenue	220	200	701	937
Other Countries [Member]
Segment Reporting Information [Line Items]
Service revenues	109	80	273	257
Subscriber Equipment Revenue	$ 142	$ 12	$ 191	$ 240