Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

Inventories consisted of the following (in thousands):

	March 31, 2018		December 31, 2017
Finished goods	$	23,736	$	21,668
Parts and materials	10,966		10,613
Work in progress	1,736		1,036
Total inventories	$	36,438	$	33,317