Related Party Transaction - Additional Information (Detail) - USD ($) |
3 Months Ended | ||
|---|---|---|---|
Oct. 07, 2016 |
Apr. 30, 2018 |
Jan. 31, 2018 |
|
| Related Party Transaction [Line Items] | |||
| Maximum number of preferred stock to be issued (in shares) | 1,000,000 | 1,000,000 | |
| Preferred stock, par value (in dollars per share) | $ 1.00 | $ 1.00 | |
| Series A Preferred Stock | |||
| Related Party Transaction [Line Items] | |||
| Preferred stock dividend rate | 9.00% | ||
| Preferred stock, par value (in dollars per share) | $ 1.00 | ||
| 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 | ||
| Percentage of compensation fees to be paid | 2.00% | ||
| Stock issued during period (in shares) | 13,713 | ||
| Gross proceeds from preferred stock | $ 319,000 | ||
| Equity distribution compensation expenses | 6,000 | ||
| Series A Preferred Stock | Non-Executive Chairman | |||
| Related Party Transaction [Line Items] | |||
| Equity distribution compensation expenses | $ 0 |