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Stock-Based Compensation (Tables) | 12 Months Ended
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Jan. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Stock Option Activity Under Equity Incentive Plans and Related Information | The following table summarizes the stock option activity under the equity incentive plans and related information:
|  | Shares Subject to Options Outstanding |  |  | Weighted- Average |  |  |  |  |
|  |  |  |  |  | Weighted- |  |  | Remaining |  |  |  |  |
|  |  |  |  |  | Average Exercise |  |  | Contractual Life |  |  | Aggregate |
|  | Shares |  |  | Price |  |  | (Years) |  |  | Intrinsic Value |
|  |  |  |  |  |  |  |  |  |  |  |  |  | (in thousands) |
Balance as of January 31, 2019 |  |  | 9,096,961 |  |  | $ | 9.01 |  |  |  | 4.97 |  |  | $ | 108,731 |
Options granted |  |  | 577,082 |  |  |  | 19.89 |  |  |  |  |  |  |  |  |
Option exercised |  |  | (659,348 | ) |  |  | 9.05 |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (242,110 | ) |  |  | 17.63 |  |  |  |  |  |  |  |  |
Balance as of January 31, 2020 |  |  | 8,772,585 |  |  | $ | 9.48 |  |  |  | 4.27 |  |  | $ | 60,221 |
Options granted |  |  | 31,666 |  |  |  | 12.48 |  |  |  |  |  |  |  |  |
Option exercised |  |  | (1,994,667 | ) |  |  | 5.14 |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (192,547 | ) |  |  | 10.73 |  |  |  |  |  |  |  |  |
Balance as of January 31, 2021 |  |  | 6,617,037 |  |  | $ | 10.77 |  |  |  | 3.77 |  |  | $ | 48,098 |
Vested and expected to vest as of January 31, 2021 |  |  | 6,554,892 |  |  | $ | 10.68 |  |  |  | 3.74 |  |  | $ | 48,092 |
Exercisable as of January 31, 2021 |  |  | 5,348,780 |  |  | $ | 8.59 |  |  |  | 2.87 |  |  | $ | 47,974 |
Shares Subject to Options Outstanding Weighted-Average Weighted-Remaining Average Exercise Contractual Life Aggregate Shares Price (Years) Intrinsic Value (in thousands) Balance as of January 31, 2019 Options granted Option exercised Options forfeited/cancelled Balance as of January 31, 2020 Options granted Option exercised Options forfeited/cancelled Balance as of January 31, 2021 Vested and expected to vest as of January 31, 2021 Exercisable as of January 31, 2021 9,096,961 $9.01 4.97 $ 108,731 577,082 19.89 (659,34) 9.05 (242,110) 17.63 8,772,585 $ 9.48 4.27 $ 60,221 31,666 12.48 (1,994,667) 5.14 (192,547) 10.73 6,617,037 $ 10.773.77 $ 48,098 6,554,892 $ 10.68 3.74 $ 48,092 5,348,780 $ 8.59 2.87 $ 47,974
Summary of Restricted Stock Unit Activity Under Equity Incentive Plans and Related Information | The following table summarizes the restricted stock unit activity under the equity incentive plans and related information:
|  | Number of |  |  | Weighted- |
|  | Restricted |  |  | Average |
|  | Stock Units |  |  | Grant Date |
|  | Outstanding |  |  | Fair Value |
Unvested balance - January 31, 2019 |  |  | 18,098,707 |  |  | $ | 19.35 |
Granted |  |  | 12,436,586 |  |  |  | 18.81 |
Vested, net of shares withheld for employee payroll taxes |  |  | (4,166,907 | ) |  |  | 19.92 |
Forfeited/cancelled |  |  | (4,560,279 | ) |  |  | 19.77 |
Unvested balance - January 31, 2020 |  |  | 21,808,107 |  |  | $ | 18.85 |
Granted |  |  | 10,702,574 |  |  |  | 15.81 |
Vested, net of shares withheld for employee payroll taxes |  |  | (5,100,239 | ) |  |  | 18.27 |
Forfeited/cancelled |  |  | (13,079,764 | ) |  |  | 17.87 |
Unvested balance - January 31, 2021 |  |  | 14,330,678 |  |  | $ | 17.68 |
er of Weighted- Restricted Average Stock Units Grant Date Outstanding Fair Value Unvested balance - January 31, 2019 18,098,707 $ 19.35 Granted 12,436,586 18.81 Vested, net of shares withheld for employee payroll taxes (4,166,907 ) 19.92 Forfeited/cancelled (4,560,279 ) 19.77 Unvested balance - January 31, 2020 21,808,107 $ 18.85 Granted 10,702,574 15.82 Vested, net of shares withheld for employee payroll taxes (5,100,239 ) 18.28 Forfeited/cancelled (13,079,764 ) 17.87 Unvested balance - January 31, 2021 14,330,678 $ 17.68
Summary of Components of Stock-Based Compensation Expense | The following table summarizes the components of stock-based compensation expense recognized in the consolidated statements of operations (in thousands):
|  | Year Ended January 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Cost of revenue |  | $ | 18,936 |  |  | $ | 16,769 |  |  | $ | 14,065 |
Research and development |  |  | 61,145 |  |  |  | 62,565 |  |  |  | 45,189 |
Sales and marketing |  |  | 42,015 |  |  |  | 38,030 |  |  |  | 36,864 |
General and administrative |  |  | 32,196 |  |  |  | 28,624 |  |  |  | 23,178 |
Total stock-based compensation |  | $ | 154,292 |  |  | $ | 145,988 |  |  | $ | 119,296 |
Summary of Estimated Fair Value of Employee Stock Options and 2015 ESPP | We estimated the fair value of employee stock options and 2015 ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions:
| Year Ended January 31, |
| 2021 |  |  | 2020 |  |  | 2019 |
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  |  |  |  | 5.8 |  |  |  | 5.5 |  | – |  | 5.8 |  |  |  | 5.5 |  | – |  | 5.8 |
Risk-free interest rate |  |  |  |  |  | 0.6 | % |  |  |  |  |  |  | 1.8 | % |  |  | 2.8 | % | – |  | 3.1 | %
Volatility |  |  |  |  |  | 46 | % |  |  |  |  |  |  | 45 | % |  |  |  |  |  |  | 45 | %
Dividend yield |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | %
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  | 0.5 |  | – |  | 2.0 |  |  |  | 0.5 |  | – |  | 2.0 |  |  |  | 0.5 |  | – |  | 2.0 |
Risk-free interest rate |  | 0.1 | % | – |  | 0.4 | % |  |  | 1.7 | % | – |  | 2.5 | % |  |  | 2.0 | % | – |  | 2.8 | %
Volatility |  | 44 | % | – |  | 54 | % |  |  | 34 | % | – |  | 55 | % |  |  | 37 | % | – |  | 50 | %
Dividend yield |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | %
Year Ended January 31, 2021 2020 2019 Employee Stock Options Expected term (in years) 5.8 5.5 – 5.8 5.5 – 5.8 Risk-free interest rate 0.6% 1.8% 2.8% – 3.1% Volatility 46% 45% 45% Dividend yield 0% 0% 0% Employee Stock Purchase Plan Expected term (in years) 0.5 – 2.0 0.5 – 2.0 0.5 – 2.0 Risk-free interest rate 0.1% – 0.4% 1.7% – 2.5% 2.0% – 2.8% Volatility 44% – 54% 34% – 55% 37% – 50% Dividend yield 0% 0% 0%

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