Income Taxes - Additional Information (Detail) - USD ($) |
3 Months Ended | ||
|---|---|---|---|
Apr. 30, 2018 |
Apr. 30, 2017 |
Jan. 31, 2018 |
|
| Income Tax Disclosure [Abstract] | |||
| Provision for income taxes | $ 437,000 | $ 229,000 | |
| Pre-tax net loss | $ 5,468,000 | $ 2,436,000 | |
| Effective tax rate | (8.00%) | (9.40%) | |
| Non-current prepaid income taxes | $ 1,603,000 | $ 1,609,000 | |
| Unrecognized tax expense or benefit | $ 0 | $ 0 | |