Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories consist of the following (in thousands):

	December 31,
	2017		2016
Raw materials and purchased parts	$	1,471	$	977
Work in progress		1,877		2,727
Finished goods		13,213		536
Total inventories	$	16,561	$	4,240