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Inventory
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventory Inventory
Inventory consisted of the following:
 June 30, 2020December 31, 2019
Raw material$899  $527  
Work in progress12,309  14,173  
Finished goods4,158  4,097  
Spare parts2,921  2,618  
Total sand inventory$20,287  $21,415