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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories consisted of the following:
December 31,
 20202019
Raw material$428 $527 
Work in progress10,465 14,173 
Finished goods4,400 4,097 
Spare parts3,843 2,618 
Total inventory$19,136 $21,415