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Stockholders' Equity - Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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Apr. 30, 2019 USD ($) Peroid $ / shares shares | Apr. 30, 2018 USD ($) $ / shares shares
ESPP |  |
Stockholders Equity Note Disclosure [Line Items] |  |
Percentage of eligible compensation subject to plan limitation | 15.00% |
Employee stock purchase plan offering period | 24 months |
Number of purchase periods | Peroid | 4 |
Purchase periods | 6 months |
Purchase price of common stock as percentage of fair market value | 85.00% |
Number of shares of common stock issued under ESPP | shares | 0.1 | 0.2
Weighted purchase price of shares of common stock under ESPP | $ 9.86 | $ 5.65
Stock Options |  |
Stockholders Equity Note Disclosure [Line Items] |  |
Employee stock option expiration period | 10 years |
Aggregate intrinsic value of vested options exercised | $ | $ 0.3 | $ 0.2
Weighted-average grant date fair value of options granted | $ 7.13 | $ 5.28
Stock Options | Maximum |  |
Stockholders Equity Note Disclosure [Line Items] |  |
Employee stock option vesting period | 4 years |
Restricted Stock Units (RSUs) | Maximum |  |
Stockholders Equity Note Disclosure [Line Items] |  |
Employee stock option vesting period | 4 years |
Restricted Stock Units (RSUs) | Minimum |  |
Stockholders Equity Note Disclosure [Line Items] |  |
Employee stock option vesting period | 1 year |

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- Definition Employee stock purchase plan offering period in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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