Stockholders' Equity (Details) - Schedule of amounts of share-based compensation expense - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Stockholders' Equity (Details) - Schedule of amounts of share-based compensation expense [Line Items]
Share-based compensation expense	$ 176	$ 302	$ 343	$ 521
Stock options [Member]
Stockholders' Equity (Details) - Schedule of amounts of share-based compensation expense [Line Items]
Share-based compensation expense	175	301	341	518
Restricted stock [Member]
Stockholders' Equity (Details) - Schedule of amounts of share-based compensation expense [Line Items]
Share-based compensation expense	$ 1	$ 1	$ 2	$ 3