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Related Party Transaction - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019 | Dec. 18, 2019
Related Party Transaction [Line Items] |  |  |  |  |
Maximum number of preferred stock to be issued (in shares) | 2,000,000 |  | 2,000,000 |  |
Preferred stock, par value (in usd per share) | $ 1.00 |  | $ 1.00 |  |
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) |  |  | 0 |  | 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 |

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