Stock-Based Compensation - Non-vested Options granted, forfeited or expired and exercised (Details) - Non-vested Options [Member]	9 Months Ended
	Apr. 30, 2021 $ / shares shares
Non-vested Options Outstanding, Beginning | shares	4,082,767
Non-vested Options Granted | shares	6,242,210
Non-vested Options Cancelled/forfeited | shares	(571,001)
Non-vested Options Vested | shares	(3,555,703)
Non-vested Options Outstanding, End | shares	6,198,273
Weighted Average Grant Date Fair value, Beginning | $ / shares	$ 1.06
Weighted Average Grant Date Fair value, Granted | $ / shares	0.35
Weighted Average Grant Date Fair value, Cancelled/forfeited | $ / shares	0.96
Weighted Average Grant Date Fair value, Vested | $ / shares	0.56
Weighted Average Grant Date Fair value, End | $ / shares	$ 0.65