Inventories (Tables)

6 Months Ended

Jun. 30, 2013

Inventory Disclosure [Abstract]

Components of inventory

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

	December 31, 2012		June 30, 2013
Purchased parts and materials	$	3,051	$	2,139
Finished goods	1,986		2,054
Total inventory	$	5,037	$	4,193