Stock-Based Compensation - Non-vested Options granted, forfeited or expired and exercised (Details)	3 Months Ended
	Oct. 31, 2020 $ / shares shares
Non-vested Options Expired	0
Non-vested Options [Member]
Non-vested Options Outstanding, Beginning	4,082,767
Non-vested Options Granted	6,222,210
Non-vested Options Expired	0
Non-vested Options Cancelled	(366,667)
Non-vested Options Vested	(2,459,053)
Non-vested Options Outstanding, End	7,479,257
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, Expired | $ / shares	0
Weighted Average Grant Date Fair value, Cancelled | $ / shares	0.79
Weighted Average Grant Date Fair value, Vested | $ / shares	0.59
Weighted Average Grant Date Fair value, End | $ / shares	$ 0.64