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Common Stock and Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Apr. 11, 2019 purchase_period | Apr. 30, 2021 USD ($) equityIncentivePlan $ / shares shares | Apr. 30, 2020 USD ($) $ / shares shares | Jan. 31, 2021 shares
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of equity incentive plans | equityIncentivePlan |  | 2 |  |
Number of shares authorized for grant (in shares) | shares |  | 22,233,800 |  | 18,059,506
Number of shares available for grant (in shares) | shares |  | 15,344,651 |  | 13,060,282
Weighted average grant date fair value of stock options (in dollars per share) | $ / shares |  | $ 17.80 | $ 6.61 |
Aggregate intrinsic value of stock options exercised |  | $ 20,500 | $ 11,500 |
Unrecognized compensation cost related to unvested stock options |  | 29,000 |  |
Stock-based compensation expense |  | $ 13,612 | 8,308 |
Stock options |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Unrecognized compensation cost related to unvested awards, period for recognition |  | 2 years 6 months |  |
RSUs |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Unrecognized compensation cost related to unvested awards, period for recognition |  | 3 years 6 months |  |
Unrecognized compensation cost related to unvested RSUs |  | $ 151,500 |  |
Awards granted (in shares) | shares |  | 1,839,607 |  |
Weight-average grant date fair value (in dollars per share) | $ / shares |  | $ 41.17 |  |
PSUs |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Unrecognized compensation cost related to unvested awards, period for recognition |  | 1 year 8 months 12 days |  |
Unrecognized compensation cost related to unvested RSUs |  | $ 4,600 |  |
Awards granted (in shares) | shares |  | 127,309 |  |
Weight-average grant date fair value (in dollars per share) | $ / shares |  | $ 41.17 |  |
Vesting period |  | 3 years |  |
ESPP |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Number of shares available for grant (in shares) | shares |  | 2,944,123 |  |
Offering period | 24 months |  |  |
Number of purchase periods within each offering period | purchase_period | 4 |  |  |
Purchase period | 6 months |  |  |
Purchase price as a percentage of fair market value of stock on the offering date or the purchase date | 85.00% |  |  |
Stock-based compensation expense |  | $ 1,800 | 1,600 |
Amount withheld on behalf of employees for future purchase |  | $ 3,000 | $ 1,900 |
Shares purchased (in shares) | shares |  | 0 | 0 |

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