Discontinued Operations (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
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	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
Less cash and equivalents of discontinued operations at end of period	0	(6,000)
Accounts receivable - net	0	1,398,000
Inventories	0	1,355,000
Other assets	0	423,000
Total assets of discontinued operations	0	3,182,000
Liabilities
Accounts payable and accrued expenses	141,000	674,000
Accrued salaries and benefits	0	236,000
Other liabilities	0	15,000
Total liabilities of discontinued operations	141,000	925,000
Operations [Abstract]
Total revenues	136,000	6,433,000
Loss from discontinued operations before income taxes	(348,000)	(3,525,000)
Gain on disposition	2,588,000	0
(Provision) benefit for income taxes	(793,000)	1,353,000
Income (loss) from discontinued operations	$ 1,447,000	$ (2,172,000)