Inventories (Tables)

12 Months Ended

Dec. 31, 2013

Inventory Disclosure [Abstract]

Components of inventory

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

	December 31,
	2012		2013
Purchased parts and materials	$	3,051	$	2,911
Finished goods	1,986		3,628
Total inventory	$	5,037	$	6,539