Summary of Changes in Equity Method Investments (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Feb. 02, 2021	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Schedule of Capitalization, Equity [Line Items]
Purchase of series B convertible preferred stock				$ 4,000
Equity in the net loss of investee		$ (528)		(528)
Series B Convertible Preferred Stock [Member] | Equity Method Investee [Member]
Schedule of Capitalization, Equity [Line Items]
Balance, beginning of period
Purchase of series B convertible preferred stock	$ 4,000			4,000
Equity in the net loss of investee				(386)
Amortization of equity method basis difference				(142)
Balance, end of period		$ 3,472		$ 3,472