Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Inventory [Line Items]
Finished systems	$ 81	$ 310
Raw materials and service parts	938	698
Work in progress	0	0
Inventory, Gross, Total	1,019	1,008
Less: Reserve for obsolete inventory	(522)	(457)
Inventory, net	$ 497	$ 551