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Stock-based Compensation (Tables) | 9 Months Ended
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Oct. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Classification of Stock-based Compensation | The following table presents the classification of stock-based compensation for the periods indicated:
|  | Three Months Ended October 31, |  |  | Nine Months Ended October 31, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
|  | (in thousands) |
Stock-based compensation: |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue |  | $ | 899 |  |  | $ | 868 |  |  | $ | 2,339 |  |  | $ | 2,694 |
Research and development |  |  | 18,637 |  |  |  | 17,898 |  |  |  | 54,653 |  |  |  | 54,809 |
Selling, general and administrative |  |  | 7,311 |  |  |  | 8,643 |  |  |  | 23,503 |  |  |  | 25,293 |
Total stock-based compensation |  | $ | 26,847 |  |  | $ | 27,409 |  |  | $ | 80,495 |  |  | $ | 82,796 |
Weighted-Average Assumptions Used to Estimate Fair Value | The following table sets forth the weighted-average assumptions used to estimate the fair value of employee stock purchase plan awards for the periods indicated:
|  | Three Months Ended October 31, |  |  | Nine Months Ended October 31, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Employee stock purchase plan awards: |  |  |  |  |  |  |  |  |  |  |  |
Volatility |  |  | 56 | % |  |  | 54 | % |  |  | 47 | % |  |  | 56 | %
Risk-free interest rate |  |  | 4.55 | % |  |  | 5.49 | % |  |  | 4.97 | % |  |  | 5.11 | %
Expected term (years) |  | 0.5 |  |  | 0.5 |  |  | 0.5 |  |  | 0.5 |
Dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Stock Option Activities | The following table summarizes stock option activities for the period indicated:
|  | Options Outstanding |
|  |  |  |  |  |  |  |  |  |  |  |  | Weighted- |  |  |  |
|  |  |  |  |  |  |  |  |  | Total Intrinsic |  |  | Average |  |  |  |
|  |  |  |  |  |  |  | Weighted- |  | Value Of |  |  | Remaining |  |  | Aggregate |
|  |  |  |  | Weighted- |  |  | Average |  | Options |  |  | Contractual |  |  | Intrinsic |
|  |  |  |  | Average |  |  | Grant-date |  | Exercised |  |  | Term |  |  | Value |
|  | Shares |  |  | Exercise Price |  |  | Fair Value |  | (in thousands) |  |  | (in years) |  |  | (in thousands) |
Outstanding at January 31, 2024 |  |  | 373,318 |  |  | $ | 46.39 |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (105,890 | ) |  |  | 37.59 |  |  |  |  | $ | 1,705 |  |  |  |  |  |  |
Forfeited |  |  | (63 | ) |  |  | 111.50 |  |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | (1,425 | ) |  |  | 50.93 |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at October 31, 2024 |  |  | 265,940 |  |  |  | 49.86 |  |  |  |  |  |  |  |  | 3.64 |  |  | $ | 2,883 |
Exercisable at October 31, 2024 |  |  | 246,289 |  |  | $ | 51.26 |  |  |  |  |  |  |  |  | 3.45 |  |  | $ | 2,377 |
Restricted Stock Unit Activities | The following table summarizes restricted stock unit activities for the period indicated:
|  |  |  |  | Weighted- |
|  |  |  |  | Average |
|  |  |  |  | Grant-Date |
|  | Shares |  |  | Fair Value |
Unvested at January 31, 2024 |  |  | 2,432,640 |  |  | $ | 82.54 |
Granted |  |  | 1,431,816 |  |  |  | 62.12 |
Vested |  |  | (851,932 | ) |  |  | 75.81 |
Forfeited |  |  | (151,000 | ) |  |  | 118.07 |
Unvested at October 31, 2024 |  |  | 2,861,524 |  |  | $ | 72.45 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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