Related Party Transactions - Additional Information (Detail)						3 Months Ended		12 Months Ended
	Dec. 15, 2017 USD ($) TradingDay $ / shares shares	Sep. 01, 2017 USD ($)	Jun. 30, 2015	Dec. 24, 2014	Mar. 12, 2013 $ / shares shares	Oct. 31, 2018 USD ($) $ / shares shares	Oct. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Jul. 31, 2018 USD ($) $ / shares shares	Feb. 20, 2018
Related Party Transaction [Line Items]
Principal amount convertible senior notes held of | $						$ 63,925,000			$ 67,625,000
Preferred stock, shares issued | shares						4,965,000			4,965,000
Preferred stock, par value | $ / shares						$ 0.01			$ 0.01
Price per share | $ / shares					$ 4.00
Issuance of warrants to acquire additional shares, shares | shares	2,000,000				2,000,000
Series C Convertible Preferred Stock
Related Party Transaction [Line Items]
Convertible preferred stock conversion price per share | $ / shares	$ 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
Related Party Transaction [Line Items]
Trading days | TradingDay	5
Steel Holdings | 5.25% Convertible Senior Notes
Related Party Transaction [Line Items]
Ownership percentage in capital stock										52.00%
Debt instrument stated percentage						5.25%			5.25%
Principal amount convertible senior notes held of | $						$ 14,900,000			$ 14,900,000
Steel Holdings | Repurchase Agreements | Warrant
Related Party Transaction [Line Items]
Repurchase price of warrant | $ / shares	$ 100
Purchase Agreement | SPHG Holdings | Series C Convertible Preferred Stock
Related Party Transaction [Line Items]
Preferred stock, shares issued | shares	35,000
Preferred stock, par value | $ / shares	$ 0.01
Price per share | $ / shares	$ 1,000
Proceeds from issuance of preferred stock | $	$ 35,000,000
Steel Services Ltd. | Management Services Agreement
Related Party Transaction [Line Items]
Fixed monthly fee to be paid in consideration of services | $		$ 95,641						$ 175,000
Total expenses incurred related to Management Services Agreement and Transfer Agreement | $						300,000	$ 500,000
SP Corporate Services Llc and Steel Services Limited | Management Services Agreement
Related Party Transaction [Line Items]
Amount due to related parties | $						$ 100,000			$ 200,000
SP Corporate and Steel Services | Management Services Agreement
Related Party Transaction [Line Items]
Management services agreement, effective date of agreement				Jan. 01, 2015
Management services agreement, amended expiration date of agreement			Dec. 31, 2015
Management services agreement, renew period			1 year
Management services agreement term						6 months