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Note Payable (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 31, 2022
Jan. 31, 2022
Jul. 09, 2021
Debt Disclosure [Abstract]      
Note payable     $ 15,000
Note payable bears interest rate, description   The Note Payable bears interest at a rate per annum equal to seven and one-quarter percent (7.25%) and thereafter at an interest rate per annum equal to the 30-day LIBOR Rate, as published in The Wall Street Journal, plus 6.90% per annum, but in no event less than seven and one-quarter percent (7.25%) per annum. The Note Payable is due on August 1, 2022, subject to the Company’s option to extend the maturity date until August 1, 2023 for a fee equal to three-quarters of one percent (0.75%) of the Note Payable.   
Interest expense $ 272 $ 544  
Unamortized debt issuance costs 222 222  
Amortization of the debt discount $ 125 $ 250