Stock-Based Compensation - Common stock options granted, forfeited or expired and exercised (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jan. 31, 2020	Jul. 31, 2019
Share-based Payment Arrangement [Abstract]
Options Outstanding, Beginning	8,116,495
Options Granted	1,404,200
Options Forfeited or expired	(397,500)
Options Exercised	0
Options Outstanding, End	9,123,195	8,116,495
Weighted Average Exercise Price per Share, Beginning	$ 0.84
Weighted Average Exercise Price per Share, Granted	2.09
Weighted Average Exercise Price per Share, Forfeited or expired	0.79
Weighted Average Exercise Price per Share, Exercised
Weighted Average Exercise Price per Share, End	$ 1.05	$ 0.84
Weighted Average Remaining Life Options Outstanding (Years)	6 years 4 months 20 days	7 years 2 months 16 days
Weighted Average Remaining Life Options Granted	4 years 8 months 2 days
Weighted Average Remaining Life Options Forfeited or expired	7 years 26 days
Aggregate Intrinsic Value Options, Outstanding Beginning	$ 15,961,391
Aggregate Intrinsic Value Options Granted	0
Aggregate Intrinsic Value Options, Outstanding Ending	$ 139,216	$ 15,961,391