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Inventories (Tables)
9 Months Ended
Apr. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventories
   April 30,
2021
   July 31,
2020
 
Raw materials  $1,287   $1,019 
Work in process   2,489    2,587 
Finished products   7,231    4,178 
   $11,007   $7,784