INVENTORY

3 Months Ended

Mar. 31, 2022

Inventory Disclosure [Abstract]

INVENTORY

INVENTORY

The components of inventory are as follows:

(in thousands)	March 31, 2022		December 31, 2021
Materials and supplies	$	14,488	$	8,899
Work in process	38,874		28,235
Finished goods	24,871		28,454
Total	$	78,233	$	65,588

Total compensation expense capitalized to inventory was $13,134 and $6,363 during the three months ended March 31, 2022 and 2021, respectively. At March 31, 2022 and December 31, 2021, $12,723 and $8,571, respectively, of compensation expense remained capitalized as part of inventory.