Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Inventory Disclosure [Abstract]    
Supplies $ 5,833 $ 5,167
Raw materials 1,830 974
Work in process 1,740 2,221
Finished goods 786 521
Total inventories $ 10,189 $ 8,883