CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jul. 31, 2020	Jul. 31, 2019
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	82,251,801	78,608,419
Common stock, shares outstanding	82,251,801	78,608,419
Series A Cumulative Redeemable Perpetual Preferred Stock
Convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized	1,000,000	1,000,000
Convertible preferred stock, shares issued	0	0
Convertible preferred stock, shares outstanding	0	0