Stockholders' Equity (Details) - Schedule of share-based compensation expense - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Stockholders' Equity (Details) - Schedule of share-based compensation expense [Line Items]
Share-based compensation expense	$ 199	$ 204	$ 725	$ 617
Options [Member]
Stockholders' Equity (Details) - Schedule of share-based compensation expense [Line Items]
Share-based compensation expense	197	202	718	609
Restricted Stocks [Member]
Stockholders' Equity (Details) - Schedule of share-based compensation expense [Line Items]
Share-based compensation expense	$ 2	$ 2	$ 7	$ 8