Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Mar. 04, 2019 |
Oct. 31, 2020 |
Oct. 31, 2019 |
Oct. 31, 2020 |
Oct. 31, 2019 |
|
| Income Taxes Disclosure [Line Items] | |||||
| Income tax expense (benefit) | $ (45) | $ 53 | $ 21 | $ 214 | |
| Income tax benefit due to reversal of tax reserves | $ 200 | ||||
| Preferred shares purchase rights, declared date as dividend | Mar. 04, 2019 | ||||
| Preferred shares purchase rights for each common stock | 1 | ||||
| Preferred shares purchase rights, record date as dividend | Mar. 15, 2019 | ||||
| Tax benefits preservation plan expiration date | Mar. 04, 2022 | ||||
| Maximum [Member] | |||||
| Income Taxes Disclosure [Line Items] | |||||
| Income tax expense (benefit) | $ 100 | $ 100 | |||
| X | ||||||||||
- Definition Income taxes disclosure. No definition available.
|
| X | ||||||||||
- Definition Number of preferred share purchase rights as dividend. No definition available.
|
| X | ||||||||||
- Definition Preferred share purchase rights as dividend payable date declared day month and year. No definition available.
|
| X | ||||||||||
- Definition Preferred share purchase rights as dividend payable date of record day month and year. No definition available.
|
| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) related to the reversal of tax reserves for uncertain tax positions. No definition available.
|
| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|