STOCKHOLDERS' EQUITY - Additional Information (Detail) $ / shares in Units, $ in Thousands		9 Months Ended
	Dec. 15, 2017 USD ($) day $ / shares shares	Apr. 30, 2019 USD ($) $ / shares shares	Apr. 30, 2018 USD ($)	Jul. 31, 2018 $ / shares shares
Equity [Line Items]
Preferred stock, shares issued (in shares) | shares		0		0
Preferred stock, par value (in usd per share)		$ 0.01		$ 0.01
Proceeds from issuance of preferred stock | $		$ 0	$ 35,000
Common stock, par value (in usd per share)		$ 0.01		$ 0.01
Series C Convertible Preferred Stock
Equity [Line Items]
Common stock, par value (in usd per share)	$ 0.01
Convertible preferred stock conversion price per share (in usd per share)	$ 1.96
Preferred stock, dividend rate, percentage	6.00%
Percentage threshold closing sale price of common stock higher than conversion price	170.00%
Series C Convertible Preferred Stock | Minimum
Equity [Line Items]
Trading days | day	5
Purchase Agreement | SPHG Holdings | Series C Convertible Preferred Stock
Equity [Line Items]
Preferred stock, shares issued (in shares) | shares	35,000
Preferred stock, par value (in usd per share)	$ 0.01
Price per share (in usd per share)	$ 1,000
Proceeds from issuance of preferred stock | $	$ 35,000
Preferred stock preference, percentage of stated value	100.00%
Preferred stock preference, percentage of declared but unpaid dividends	100.00%