Stock-Based Compensation - Common stock options granted, forfeited or expired and exercised (Details) - USD ($)	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Share-based Payment Arrangement [Abstract]
Options Outstanding, Beginning	8,116,495	261,178
Options Granted	1,404,200	10,898,925
Options Forfeited or expired	(673,670)	(3,043,608)
Options Outstanding, End	8,847,025	8,116,495	261,178
Weighted Average Exercise Price per Share, Beginning	$ 0.85	$ 1.7
Weighted Average Exercise Price per Share, Granted	1.49	0.69
Weighted Average Exercise Price per Share, Forfeited or expired	1.51	(0.44)
Weighted Average Exercise Price per Share, End	$ 0.9	$ 0.85	$ 1.7
Weighted Average Remaining Life Options Outstanding (Years)	5 years 11 months 15 days	7 years 2 months 19 days	2 months 19 days
Weighted Average Remaining Life Options Granted	4 years 2 months 1 day	7 years 8 months 16 days
Weighted Average Remaining Life Options Forfeited or expired	5 years 5 months 12 days	8 years 4 months 6 days
Aggregate Intrinsic Value Options, Outstanding Beginning	$ 16,306,351	$ 18,107
Aggregate Intrinsic Value Options Granted		20,821,821
Aggregate Intrinsic Value Options, Outstanding Ending	$ 508,932	$ 16,306,351	$ 18,107