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Stock-based Compensation (Tables) | 9 Months Ended
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Oct. 31, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [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, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
|  | (in thousands) |
Stock-based compensation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenue |  | $ | 360 |  |  | $ | 391 |  |  | $ | 1,071 |  |  | $ | 1,073 |
Research and development |  |  | 18,741 |  |  |  | 13,725 |  |  |  | 53,775 |  |  |  | 36,444 |
Selling, general and administrative |  |  | 9,000 |  |  |  | 7,937 |  |  |  | 27,205 |  |  |  | 22,750 |
Total stock-based compensation |  | $ | 28,101 |  |  | $ | 22,053 |  |  | $ | 82,051 |  |  | $ | 60,267 |
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:
|  | Three Months Ended October 31, |  |  | Nine Months Ended October 31, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Stock Options: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volatility |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 51 | %
Risk-free interest rate |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.98 | %
Expected term (years) |  |  | — |  |  |  | — |  |  |  | — |  |  | 5.27 |
Dividend yield |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0 | %
Employee stock purchase plan awards: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Volatility |  |  | 72 | % |  |  | 54 | % |  |  | 81 | % |  |  | 57 | %
Risk-free interest rate |  |  | 3.78 | % |  |  | 0.05 | % |  |  | 2.32 | % |  |  | 0.06 | %
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:
|  | Option 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, 2022 |  |  | 619,322 |  |  | $ | 40.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised |  |  | (79,880 | ) |  |  | 30.79 |  |  |  |  |  |  | $ | 4,696 |  |  |  |  |  |  |  |  |
Forfeited |  |  | (7,995 | ) |  |  | 49.19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expired |  |  | (1,418 | ) |  |  | 19.81 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at October 31, 2022 |  |  | 530,029 |  |  |  | 41.40 |  |  |  |  |  |  |  |  |  |  | 4.42 |  |  | $ | 8,605 |
Exercisable at October 31, 2022 |  |  | 392,266 |  |  | $ | 43.51 |  |  |  |  |  |  |  |  |  |  |  | 3.47 |  |  | $ | 5,417 |
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, 2022 |  |  | 2,651,135 |  |  | $ | 85.41 |
Granted |  |  | 1,499,374 |  |  |  | 74.42 |
Vested |  |  | (1,258,895 | ) |  |  | 69.81 |
Forfeited |  |  | (77,346 | ) |  |  | 101.36 |
Unvested at October 31, 2022 |  |  | 2,814,268 |  |  | $ | 86.40 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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