Related Party Transaction - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2020	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Sep. 30, 2020	Aug. 03, 2020	Aug. 02, 2020	Dec. 18, 2019
Related Party Transaction [Line Items]
Maximum number of preferred stock to be issued (in shares)	2,000,000	2,000,000		2,000,000			2,000,000	1,000,000
Preferred stock, par value (in usd per share)	$ 1.00	$ 1.00		$ 1.00
Maximum number of common stock to be issued (in shares)	40,000,000	40,000,000		40,000,000			40,000,000	20,000,000
Common stock, par value (in usd per share)	$ 0.01	$ 0.01		$ 0.01
Net proceeds from common stock offering				$ 1,291,000	$ 0
Non-Executive Chairman
Related Party Transaction [Line Items]
Equity distribution compensation expenses		$ 0
Ladenburg Thalmann & Co. Inc.
Related Party Transaction [Line Items]
Stock issued during period (in shares)		676,283
Equity distribution compensation expenses		$ 30,500
Maximum number of common stock to be issued (in shares)						5,000,000
Common stock, par value (in usd per share)						$ 0.01
Net proceeds from common stock offering		$ 1,300,000
Series A Preferred Stock | Non-Executive Chairman
Related Party Transaction [Line Items]
Equity distribution compensation expenses					$ 0
Series A Preferred Stock | Ladenburg Thalmann & Co. Inc.
Related Party Transaction [Line Items]
Maximum number of preferred stock to be issued (in shares)						500,000			500,000
Preferred stock dividend rate	9.00%
Preferred stock, par value (in usd per share)									$ 1.00
Percentage of compensation fees to be paid	2.00%
Stock issued during period (in shares)	994,046		70,282		86,938
Preferred stock issued from at the market sale of stock program (as a percent)				100.00%
Gross proceeds from preferred stock			$ 1,700,000		$ 2,100,000
Equity distribution compensation expenses			$ 34,000		$ 42,000