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Employee Benefits and Stock-based Compensation (Tables) | 12 Months Ended
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Jan. 31, 2024
Postemployment Benefits [Abstract] |
Classification of Stock-based Compensation | The following table presents the classification of stock-based compensation for the periods indicated:
|  | Year Ended January 31, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
|  | (in thousands) |
Stock-based compensation: |  |  |  |  |  |  |  |  |
Cost of revenue |  | $ | 3,341 |  |  | $ | 3,597 |  |  | $ | 1,489 |
Research and development |  |  | 72,759 |  |  |  | 71,236 |  |  |  | 54,787 |
Selling, general and administrative |  |  | 35,216 |  |  |  | 36,325 |  |  |  | 31,525 |
Total stock-based compensation |  | $ | 111,316 |  |  | $ | 111,158 |  |  | $ | 87,801 |
Weighted-Average Assumptions Used to Estimate Fair Value | The following table sets forth the weighted-average assumptions used to estimate the fair value of stock options and employee stock purchase plan awards for the periods indicated:
|  | Year Ended January 31, |
|  | 2024 |  |  | 2023 |  |  | 2022 |
Stock Options: |  |  |  |  |  |  |  |  |
Volatility |  |  | — |  |  |  | — |  |  |  | 51 | %
Risk-free interest rate |  |  | — |  |  |  | — |  |  |  | 1.04 | %
Expected term (years) |  |  | — |  |  |  | — |  |  |  | 5.06 |
Dividend yield |  |  | — |  |  |  | — |  |  |  | 0 | %
Employee stock purchase plan awards: |  |  |  |  |  |  |  |  |
Volatility |  |  | 56 | % |  |  | 81 | % |  |  | 57 | %
Risk-free interest rate |  |  | 5.11 | % |  |  | 2.32 | % |  |  | 0.06 | %
Expected term (years) |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |
Dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Stock Option Activities | The following table summarizes stock option activities for the periods indicated:
|  | Option Outstanding |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Weighted- |  |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  | Total Intrinsic |  |  | Average |  |  |
|  |  |  |  |  |  |  | Weighted- |  |  | Weighted- |  |  | Value of |  |  | Remaining |  | Aggregate |
|  |  |  |  | Weighted- |  |  | Average |  |  | Average |  |  | options |  |  | Contractual |  | Intrinsic |
|  |  |  |  | Average |  |  | Grant-date |  |  | Acquisition-date |  |  | Exercised |  |  | Term |  | Value |
|  | Shares |  |  | Exercise Price |  |  | Fair Value |  |  | Fair Value |  |  | (in thousands) |  |  | (in years) |  | (in thousands) |
Outstanding at January 31, 2021 |  |  | 719,143 |  |  | $ | 38.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  | 14,700 |  |  |  | 110.19 |  |  | $ | 50.28 |  |  |  |  |  |  |  |  |  |  |  |
Assumed |  |  | 163,581 |  |  |  | 23.10 |  |  |  |  |  | $ | 173.04 |  |  |  |  |  |  |  |  |
Exercised |  |  | (269,287 | ) |  |  | 28.23 |  |  |  |  |  |  |  |  | $ | 25,622 |  |  |  |  |  |
Forfeited |  |  | (7,669 | ) |  |  | 68.95 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | (1,146 | ) |  |  | 9.86 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at January 31, 2022 |  |  | 619,322 |  |  |  | 40.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (121,624 | ) |  |  | 30.34 |  |  |  |  |  |  |  |  | $ | 6,712 |  |  |  |  |  |
Forfeited |  |  | (10,618 | ) |  |  | 55.97 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | (2,289 | ) |  |  | 39.19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at January 31, 2023 |  |  | 484,791 |  |  |  | 42.18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (104,931 | ) |  |  | 26.06 |  |  |  |  |  |  |  |  | $ | 4,479 |  |  |  |  |  |
Forfeited |  |  | (926 | ) |  |  | 42.59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | (5,616 | ) |  |  | 63.39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at January 31, 2024 |  |  | 373,318 |  |  |  | 46.39 |  |  |  |  |  |  |  |  |  |  |  | 3.43 |  | $ | 16,454 |
Exercisable at January 31, 2024 |  |  | 326,464 |  |  | $ | 47.75 |  |  |  |  |  |  |  |  |  |  |  | 2.95 |  | $ | 13,920 |
Restricted Stock Unit Activities | The following table summarizes restricted stock unit activities for the periods indicated:
|  |  |  |  | Weighted- |
|  |  |  |  | Average |
|  |  |  |  | Grant-Date |
|  | Shares |  |  | Fair Value |
Unvested at January 31, 2021 |  |  | 2,871,801 |  |  | $ | 51.73 |
Granted |  |  | 1,213,257 |  |  |  | 128.80 |
Vested |  |  | (1,367,309 | ) |  |  | 53.85 |
Forfeited |  |  | (66,614 | ) |  |  | 71.59 |
Unvested at January 31, 2022 |  |  | 2,651,135 |  |  |  | 85.41 |
Granted |  |  | 1,549,174 |  |  |  | 74.45 |
Vested |  |  | (1,513,972 | ) |  |  | 71.32 |
Forfeited |  |  | (112,978 | ) |  |  | 99.46 |
Unvested at January 31, 2023 |  |  | 2,573,359 |  |  |  | 86.81 |
Granted |  |  | 1,305,401 |  |  |  | 70.32 |
Vested |  |  | (1,220,608 | ) |  |  | 78.62 |
Forfeited |  |  | (225,512 | ) |  |  | 81.79 |
Unvested at January 31, 2024 |  |  | 2,432,640 |  |  | $ | 82.54 |

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