Quarterly report pursuant to Section 13 or 15(d)

Stockholders??? Equity (Details) - Schedule of amounts of share-based compensation expense

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Stockholders’ Equity (Details) - Schedule of amounts of share-based compensation expense - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Stockholders’ Equity (Details) - Schedule of amounts of share-based compensation expense [Line Items]        
Share-based compensation expense $ 297 $ 207 $ 640 $ 728
Stock options and performance stock units [Member]        
Stockholders’ Equity (Details) - Schedule of amounts of share-based compensation expense [Line Items]        
Share-based compensation expense $ 297 206 638 724
Restricted stock [Member]        
Stockholders’ Equity (Details) - Schedule of amounts of share-based compensation expense [Line Items]        
Share-based compensation expense   $ 1 $ 2 $ 4