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Related Party Transaction - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Apr. 30, 2021 | Apr. 30, 2020 | Jan. 31, 2020 | Jan. 31, 2021 | 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 | 1,000,000 |
Preferred stock, par value (in usd per share) |  | $ 1.00 |  |  | $ 1.00 |  |  |  |
Maximum number of common stock to be issued (in shares) |  | 40,000,000 |  |  | 40,000,000 |  | 40,000,000 | 20,000,000 |
Common stock, par value (in usd per share) |  | $ 0.01 |  |  | $ 0.01 |  |  |  |
Net proceeds from common stock offering |  | $ 42,000 | $ 0 |  |  |  |  |  |
Ladenburg Thalmann & Co. Inc. |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Maximum number of common stock to be issued (in shares) |  |  |  |  |  | 5,000,000 |  |  |
Common stock, par value (in usd per share) |  |  |  |  |  | $ 0.01 |  |  |
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 | 20,960 |  |  |  |  |  |  |
Preferred stock issued from at the market sale of stock program (as a percent) |  |  |  | 100.00% |  |  |  |  |
Net proceeds from preferred stock |  | $ 503,000 |  |  |  |  |  |  |
Equity distribution compensation expenses |  | 10,000 |  |  |  |  |  |  |
Common Stock | Non-Executive Chairman |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Equity distribution compensation expenses |  | $ 0 |  |  |  |  |  |  |
Common Stock | Ladenburg Thalmann & Co. Inc. |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Stock issued during period (in shares) |  | 18,053 |  |  |  |  |  |  |
Equity distribution compensation expenses |  | $ 1,000 |  |  |  |  |  |  |
Net proceeds from common stock offering |  | $ 42,000 |  |  |  |  |  |  |

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