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FAIR VALUE MEASUREMENTS - Schedule of Changes in Derivative Liability (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Changes in Fair Value of Derivative Liability [Roll Forward]    
Derivative Liability, Beginning Balance $ 0  
Change in fair value of derivative liability 64,740 $ 0
Derivative Liability, Ending Balance $ 295,650