Stock-Based Compensation - Information on stock options outstanding (Details) - USD ($)	6 Months Ended
	Jan. 31, 2019	Jul. 31, 2018
Options Outstanding	6,238,472	232,218
Weighted Average Exercise Price per Share	$ 0.56	$ 1.46
Options Weighted Average Remaining Life (Years)	9 years 8 months 26 days
Options Aggregate Intrinsic Value	$ 10,320,281
Exercise Price 0.64
Options Range of Exercise Price	$ 0.64
Options Outstanding	1,328,125
Weighted Average Exercise Price per Share	$ 0.14
Options Weighted Average Remaining Life (Years)	9 years 9 months 3 days
Options Aggregate Intrinsic Value	$ 1,978,906
Exercise Price 0.78
Options Range of Exercise Price	$ 0.78
Options Outstanding	1,712.500
Weighted Average Exercise Price per Share	$ 0.21
Options Weighted Average Remaining Life (Years)	9 years 10 months 14 days
Options Aggregate Intrinsic Value	$ 2,311,875
Exercise Price 0.92
Options Range of Exercise Price	$ 0.92
Options Outstanding	200,000
Weighted Average Exercise Price per Share	$ 0.03
Options Weighted Average Remaining Life (Years)	9 years 11 months 1 day
Options Aggregate Intrinsic Value	$ 242,000
Exercise Price 1.08
Options Range of Exercise Price	$ 1.08
Options Outstanding	250,000
Weighted Average Exercise Price per Share	$ 0.04
Options Weighted Average Remaining Life (Years)	9 years 11 months 4 days
Options Aggregate Intrinsic Value	$ 262,500
Exercise Price 30.48
Options Range of Exercise Price	$ 30.48
Options Outstanding	17,850
Weighted Average Exercise Price per Share	$ 0.09
Options Weighted Average Remaining Life (Years)	1 year 1 month 6 days
Options Aggregate Intrinsic Value
Exercise Price 0.11
Options Range of Exercise Price	$ 0.11
Options Outstanding	2,730,000
Weighted Average Exercise Price per Share	$ 0.05
Options Weighted Average Remaining Life (Years)	9 years 8 months 5 days
Options Aggregate Intrinsic Value	$ 5,525,000