Inventories (Tables)

3 Months Ended

Mar. 31, 2015

Inventory Disclosure [Abstract]

Components of inventory

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

	December 31, 2014		March 31, 2015
Purchased parts and materials	$	2,273	$	2,568
Finished goods	9,069		6,884
Total inventory	$	11,342	$	9,452