Goodwill and Intangible Assets - Schedule of Amortization Expense of Intangible Assets in Cost of Revenue and Operating Expense (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
|
| Goodwill And Intangible Assets [Line Items] | ||
| Amortization expense | $ 298 | $ 404 |
| Cost of Revenue [Member] | ||
| Goodwill And Intangible Assets [Line Items] | ||
| Amortization expense | 178 | |
| Selling and Marketing [Member] | ||
| Goodwill And Intangible Assets [Line Items] | ||
| Amortization expense | 185 | 145 |
| Research and Development [Member] | ||
| Goodwill And Intangible Assets [Line Items] | ||
| Amortization expense | $ 113 | $ 81 |