Inventory

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Inventory

5. Inventory

Inventory consisted of the following at September 30, 2021 and December 31, 2020 (in thousands):

	September 30, 2021		December 31, 2020
Finished goods	$	566	$	600
Work-in-process		943		802
Raw materials and supplies		33,415		31,683
Inventory	$	34,924	$	33,085