CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Oct. 31, 2021	Jul. 31, 2021
Accounts receivable, trade, allowance for doubtful accounts	$ 44	$ 49
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	4,965,000	4,965,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,400,000,000	1,400,000,000
Common stock, shares issued (in shares)	60,437,654	63,099,496
Common stock, shares outstanding (in shares)	60,437,654	63,099,496
Contingent Redeemable Preferred Stock
Preferred stock, par value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	35,000	35,000
Preferred stock, shares issued (in shares)	35,000	35,000
Preferred stock, shares outstanding (in shares)	35,000	35,000