CAPITAL STOCK AND ADDITIONAL PAID-IN CAPITAL - Schedule of Warrants Roll Forward (Details) - $ / shares	9 Months Ended
	Apr. 30, 2022	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Capital Stock And Additional Paid In Capital [Line Items]
Number of Warrants	12,380,442	6,851,380	12,472,000	8,196,524
Exercise Price	$ 0.95	$ 1.14	$ 1.27	$ 1.57
Warrant One [Member]
Capital Stock And Additional Paid In Capital [Line Items]
Number of Warrants	518,407
Exercise Price	$ 1
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date	Jul. 03, 2022
Warrant Two [Member]
Capital Stock And Additional Paid In Capital [Line Items]
Number of Warrants	2,302,517
Exercise Price	$ 1
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date	Aug. 19, 2022
Warrant Three [Member]
Capital Stock And Additional Paid In Capital [Line Items]
Number of Warrants	1,150,000
Exercise Price	$ 1
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date	Sep. 03, 2022
Warrant Four [Member]
Capital Stock And Additional Paid In Capital [Line Items]
Number of Warrants	2,225,352
Exercise Price	$ 1.36
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date	Jul. 31, 2022
Warrant Five [Member]
Capital Stock And Additional Paid In Capital [Line Items]
Number of Warrants	166,666
Exercise Price	$ 1.36
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date	Sep. 21, 2022
Warrant Six [Member]
Capital Stock And Additional Paid In Capital [Line Items]
Number of Warrants	6,017,500
Exercise Price	$ 0.76
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date	Jan. 28, 2024