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Inventory (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventory consisted of the following:
 September 30, 2020December 31, 2019
Raw material$784 $527 
Work in progress12,208 14,173 
Finished goods6,710 4,097 
Spare parts3,866 2,618 
Total sand inventory$23,568 $21,415