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Common Stock and Stockholders' Equity (Tables) | 3 Months Ended
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Apr. 30, 2021
Equity [Abstract] |
Summary of Shares of Common Stock Reserved for Future Issuance | Shares of common stock reserved for future issuance are as follows:
| April 30, 2021
Outstanding stock options and unvested RSUs and PSUs outstanding | 16,170,681 |
Available for future stock option, RSU, and PSU grants | 15,344,651 |
Available for ESPP | 2,944,123 |
Total common stock reserved at April 30, 2021 | 34,459,455 |
Schedule of Stock Option Activity | Stock option activity is as follows:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
|  |  |  |  |  |  | (in thousands)
Outstanding at January 31, 2021 | 11,177,838 |  |  | $ | 8.25 |  |  | 6.9 years |  | $ | 452,452 |
Granted | 32,428 |  |  | $ | 41.17 |  |  |  |  |
Exercised | (536,593) |  |  | $ | 5.23 |  |  |  |  |
Canceled | (40,185) |  |  | $ | 9.09 |  |  |  |  |
Outstanding at April 30, 2021 | 10,633,488 |  |  | $ | 8.50 |  |  | 6.7 years |  | $ | 361,089 |
Vested as of April 30, 2021 | 7,447,293 |  |  | $ | 6.00 |  |  | 6.2 years |  | $ | 271,497 |
Schedule of Assumptions Used to Calculate Fair Value of Employee Stock Option Grants Made | The following assumptions were used to calculate the fair value of employee stock option grants made during the periods:
| Three Months Ended April 30,
| 2021 |  | 2020
Expected dividend yield | — | % |  | — | %
Expected volatility | 43.8% |  | 43.3 | %
Expected term (years) | 6.1 |  | 6.1
Risk-free interest rate | 1.16% |  | 0.46% - 0.47%
Schedule of Restricted Stock Unit Activity | A summary of the Company’s RSU activity and related information is as follow:
| Number of RSUs |  | Weighted Average Grant Date Fair Value Per Share
Outstanding at January 31, 2021 | 3,971,128 |  |  | $ | 23.60 |
Granted | 1,839,607 |  |  | $ | 41.17 |
Vested | (174,135) |  |  | $ | 18.48 |
Canceled | (226,716) |  |  | $ | 24.10 |
Outstanding at April 30, 2021 | 5,409,884 |  |  | $ | 29.72 |
Schedule of Stock-based Compensation Expense | Stock-based compensation expense included in the Company’s condensed consolidated statements of operations is as follows:
| Three Months Ended April 30,
| 2021 |  | 2020
| (in thousands)
Cost of revenue | $ | 676 |  |  | $ | 344 |
Research and development | 4,440 |  |  | 2,183 |
Sales and marketing | 3,954 |  |  | 2,285 |
General and administrative | 4,542 |  |  | 3,496 |
Total | $ | 13,612 |  |  | $ | 8,308 |

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