Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Inventory Disclosure [Abstract]    
Supplies $ 5,559 $ 4,557
Raw materials 800 701
Work in process 1,186 2,435
Finished goods 455 673
Total inventories $ 8,000 $ 8,366