Inventories (Tables)

12 Months Ended

Dec. 31, 2012

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories consisted of the following (in thousands):

	December 31,
	2012		2011
Finished goods and demonstration equipment	$	2,677	$	2,644
Purchased parts and subassemblies	3,359		3,554
Total inventories	$	6,036	$	6,198