Inventory (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of inventory

Inventory consists of the following at March 31, 2018 (in thousands):

	March 31, 2018		December 31, 2017
Raw materials	$	3,943	$	3,852
Work in process	1,163		313
Finished goods	332		201
Total inventories	$	5,438	$	4,366