Stockholders' Equity (Details) - Schedule of share-based payment arrangement, cost by plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Stockholders' Equity (Details) - Schedule of share-based payment arrangement, cost by plan [Line Items]
Share-based compensation expense	$ 207	$ 291	$ 728	$ 526
Stock options [Member]
Stockholders' Equity (Details) - Schedule of share-based payment arrangement, cost by plan [Line Items]
Share-based compensation expense	206	289	724	521
Restricted Stocks [Member]
Stockholders' Equity (Details) - Schedule of share-based payment arrangement, cost by plan [Line Items]
Share-based compensation expense	$ 1	$ 2	$ 4	$ 5