Inventories (Tables)

6 Months Ended

Jun. 30, 2020

Inventory Disclosure [Abstract]

Schedule of inventory

A summary of the Company's inventories is shown below (in thousands):

	June 30,		December 31,
	2020		2019
Supplies	$	7,030	$	9,598
Raw materials	887		746
Work in process	2,926		4,608
Finished goods	1,630		2,531
Total inventories	$	12,473	$	17,483