Inventories (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Schedule of inventory

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

	March 31,		December 31,
	2020		2019
Supplies	$	7,851	$	9,598
Raw materials	997		746
Work in process	3,221		4,608
Finished goods	1,124		2,531
Total inventories	$	13,193	$	17,483