Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Inventory [Line Items]
Finished systems	$ 81	$ 310
Raw materials and service parts	1,012	698
Work in progress	0	0
Inventory, Gross, Total	1,093	1,008
Less: Reserve for obsolete inventory	(552)	(457)
Inventory, net	$ 541	$ 551