Quarterly report pursuant to Section 13 or 15(d)

Revenue Recognition (Details)

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Revenue Recognition (Details)
3 Months Ended 6 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Revenue Recognition (Details) [Line Items]        
Percentage of total revenues   76.00%   75.00%
Clinical Services Revenue [Member]        
Revenue Recognition (Details) [Line Items]        
Percentage of total revenues 70.00%   72.00%