CAPITAL STOCK (Details 4)	6 Months Ended
	Jan. 31, 2018 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding, Ending balance | shares	13,820,750
Options Outstanding, Weighted Average Exercise Price, Ending balance	$ 1.34
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	2 years 5 months 19 days
Options Exercisable, Ending balance | shares	11,911,625
Options Exercisable, Weighted Average Exercise Price, Ending balance	$ 1.35
Options Exercisable, Weighted Average Remaining Contractual Term (Years)	2 years 1 month 24 days
Exercise Price Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 0.45
Exercise Price Range, Upper Range Limit	$ 1.06
Options Outstanding, Ending balance | shares	2,671,750
Options Outstanding, Weighted Average Exercise Price, Ending balance	$ 0.80
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	2 years 6 months 4 days
Options Exercisable, Ending balance | shares	2,626,125
Options Exercisable, Weighted Average Exercise Price, Ending balance	$ 0.80
Options Exercisable, Weighted Average Remaining Contractual Term (Years)	2 years 5 months 26 days
Exercise Price Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 1.07
Exercise Price Range, Upper Range Limit	$ 2.00
Options Outstanding, Ending balance | shares	9,876,500
Options Outstanding, Weighted Average Exercise Price, Ending balance	$ 1.28
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	2 years 5 months 1 day
Options Exercisable, Ending balance | shares	8,013,000
Options Exercisable, Weighted Average Exercise Price, Ending balance	$ 1.29
Options Exercisable, Weighted Average Remaining Contractual Term (Years)	1 year 11 months 5 days
Exercise Price Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 2.01
Exercise Price Range, Upper Range Limit	$ 3.86
Options Outstanding, Ending balance | shares	1,272,500
Options Outstanding, Weighted Average Exercise Price, Ending balance	$ 2.89
Options Outstanding, Weighted Average Remaining Contractual Term (Years)	2 years 9 months 29 days
Options Exercisable, Ending balance | shares	1,272,500
Options Exercisable, Weighted Average Exercise Price, Ending balance	$ 2.89
Options Exercisable, Weighted Average Remaining Contractual Term (Years)	2 years 9 months 29 days