Related Party Transaction - Additional Information (Detail) - USD ($)			3 Months Ended	12 Months Ended
	Oct. 07, 2016	Jun. 08, 2016	Jan. 31, 2018	Jan. 31, 2018	Jan. 31, 2017
Related Party Transaction [Line Items]
Stock issued during period (in shares)			532,000	532,000	343,000
Maximum number of preferred stock to be issued (in shares)			1,000,000	1,000,000	1,000,000
Net proceeds from preferred stock			$ 2,400,000
Series A Preferred Stock
Related Party Transaction [Line Items]
Stock issued during period (in shares)		320,000
Series A Preferred Stock | Ladenburg Thalmann & Co. Inc.
Related Party Transaction [Line Items]
Underwriting discounts, commissions and fees		$ 440,000
Percentage of structuring fee received		0.50%
Structuring fee to underwriter		$ 40,000
Maximum number of preferred stock to be issued (in shares)	500,000
Percentage of compensation fees to be paid	2.00%
Stock issued during period (in shares)			106,918	188,822
Gross proceeds from preferred stock			$ 2,500,000	$ 4,400,000
Equity distribution compensation expenses			49,000	$ 86,000
Series A Preferred Stock | Non-Executive Chairman
Related Party Transaction [Line Items]
Underwriting discounts, commissions and fees		$ 0
Equity distribution compensation expenses			$ 0