Inventories (Tables)

12 Months Ended

Dec. 31, 2018

Inventory Disclosure [Abstract]

Components of Inventory

Inventories consist of the following (in thousands):

	December 31,
	2018		2017
Raw materials	$	1,337	$	572
Work-in-process		1,605		1,273
Finished goods		655		812
Total inventory	$	3,597	$	2,657