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Related Party Transaction - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 07, 2016 | Jun. 08, 2016 | Jan. 31, 2017 | Jan. 31, 2017 | Jan. 31, 2016
Related Party Transaction [Line Items] |  |  |  |  |
Stock issued during period |  |  | 343,000 | 343,000 | 0
Maximum number of preferred stock to be issued |  |  | 1,000,000 | 1,000,000 | 1,000,000
Net proceeds from preferred stock |  |  | $ 346,000 |  |
Series A Preferred Stock [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Stock issued during period |  | 320,000 |  |  |
Series A Preferred Stock [Member] | Ladenburg Thalmann & Co. Inc. [Member] |  |  |  |  |
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 | 500,000 |  |  |  |
Percentage of compensation fees to be paid | 2.00% |  |  |  |
Stock issued during period |  |  | 15,184 | 23,174 |
Gross proceeds from preferred stock |  |  | $ 353,000 | $ 543,000 |
Equity distribution compensation expenses |  |  | 7,000 | $ 11,000 |
Series A Preferred Stock [Member] | Non-Executive Chairman [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Underwriting discounts, commissions and fees |  | $ 0 |  |  |
Equity distribution compensation expenses |  |  | $ 0 |  |

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