Inventories (Tables)

3 Months Ended

Mar. 31, 2014

Inventory Disclosure [Abstract]

Components of inventory

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

	December 31, 2013		March 31, 2014
Purchased parts and materials	$	2,911	$	4,367
Finished goods	3,628		3,297
Total inventory	$	6,539	$	7,664