INVENTORY

12 Months Ended

Dec. 31, 2021

Inventory Disclosure [Abstract]

INVENTORY

INVENTORY

The components of inventory are as follows:

	As of December 31,
(in thousands)	2021		2020
Materials and supplies	$	8,899	$	7,756
Work in process	28,235		13,615
Finished goods	28,454		7,626
Total	$	65,588	$	28,997

Total compensation expense capitalized to inventory was $35,663, $15,588, and $1,918 during the year ended December 31, 2021, 2020, and 2019, respectively. At December 31, 2021 and 2020, $8,571 and $5,909, respectively, of compensation expense remained capitalized as part of inventory.