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Balance Sheet Components (Details Textual) - USD ($)
3 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Jul. 31, 2021
Balance Sheet Related Disclosures [Abstract]      
Property and equipment pledged as collateral $ 0   $ 0
Depreciation 3,600,000 $ 3,600,000  
Amortization 1,200,000 600,000  
Amortization expense $ 3,800,000 $ 6,300,000