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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory A summary of the Company's inventories is shown below (in thousands):
September 30,December 31,
20202019
Supplies$6,832 $9,598 
Raw materials543 746 
Work in process3,858 4,608 
Finished goods2,064 2,531 
Total inventories$13,297 $17,483