Consolidated Balance Sheet Detail - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jul. 31, 2018 |
Jul. 31, 2017 |
Jul. 31, 2018 |
Jul. 31, 2017 |
|
| Balance Sheet Related Disclosures [Abstract] | ||||
| Depreciation and amortization expense | $ 400 | $ 600 | $ 737 | $ 1,198 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|