Discontinued Operations (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Consideration payable by ORBCOMM aggregate		$ 6,123,000
Amount of cash receivable as consideration		4,000,000
Value of common stock receivable as consideration		2,123,000
Amount held in escrow to settle future claims	828,000	1,274,000
Contingent consideration payable by ORBCOMM, maximum		3,950,000
Contingent consideration payable if new subscriber targets are met, maximum		3,000,000
Contingent consideration payable if sales targets are met, maximum		950,000
Number of days for which average closing price is taken for shares		20 days
Assets
Cash	0	0	0
Accounts receivable - net	0		0
Inventories	0		0
Other assets	0		0
Total assets of discontinued operations	0		0
Liabilities
Accounts payable and accrued expenses	104,000		141,000
Accrued salaries and benefits	0		0
Other liabilities	0		0
Total liabilities of discontinued operations	104,000		141,000
Operations [Abstract]
Total revenues	0	136,000
Loss from discontinued operations before income taxes	(22,000)	(248,000)
Gain on disposition	0	2,588,000
(Provision) benefit for income taxes	7,000	(910,000)
Income (loss) from discontinued operations	$ (15,000)	$ 1,430,000