Inventories (Tables)

6 Months Ended

Jun. 30, 2012

Inventory Disclosure [Abstract]

Components of inventories

The components of inventories consist of the following (in thousands):

	December 31, 2011		June 30, 2012
Purchased parts and materials	$	3,994	$	2,982
Finished goods	1,257		1,674
Total inventory	$	5,251	$	4,656