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Stock-Based Compensation (Tables) | 9 Months Ended
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Oct. 31, 2019
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 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (417,245 | ) |  |  | 7.21 |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (60,972 | ) |  |  | 18.00 |  |  |  |  |  |  |  |  |
Balance as of October 31, 2019 |  |  | 9,195,826 |  |  | $ | 9.71 |  |  |  | 4.55 |  |  | $ | 72,392 |
Vested and expected to vest as of October 31, 2019 |  |  | 9,119,519 |  |  | $ | 9.63 |  |  |  | 4.51 |  |  | $ | 72,389 |
Exercisable as of October 31, 2019 |  |  | 7,579,160 |  |  | $ | 7.60 |  |  |  | 3.68 |  |  | $ | 72,342 |
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 |  |  | 11,032,086 |  |  |  | 19.02 |
Vested, net of shares withheld for employee payroll taxes |  |  | (3,275,859 | ) |  |  | 20.00 |
Forfeited/cancelled |  |  | (3,320,045 | ) |  |  | 19.68 |
Unvested balance - October 31, 2019 |  |  | 22,534,889 |  |  | $ | 19.04 |
Summary of Components of Stock-Based Compensation Expense | The following table summarizes the components of stock-based compensation expense recognized in the condensed consolidated statements of operations (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | October 31, |  |  | October 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Cost of revenue |  | $ | 4,428 |  |  | $ | 3,598 |  |  | $ | 12,399 |  |  | $ | 10,280 |
Research and development |  |  | 16,653 |  |  |  | 12,043 |  |  |  | 44,878 |  |  |  | 33,668 |
Sales and marketing |  |  | 9,250 |  |  |  | 9,708 |  |  |  | 28,644 |  |  |  | 27,701 |
General and administrative |  |  | 7,427 |  |  |  | 6,441 |  |  |  | 21,004 |  |  |  | 17,437 |
Total stock-based compensation |  | $ | 37,758 |  |  | $ | 31,790 |  |  | $ | 106,925 |  |  | $ | 89,086 |
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.
|  | Three Months Ended | Nine Months Ended |
|  | October 31, |  |  | October 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  |  |  |  | N/A |  |  |  |  |  |  |  | 5.8 |  |  |  | 5.5 |  | - |  | 5.8 |  |  |  | 5.5 |  | - |  | 5.8 |
Risk-free interest rate |  |  |  |  |  | N/A |  |  |  |  |  |  |  | 3.1 | % |  |  |  |  |  |  | 1.8 | % |  |  | 2.8 | % | - |  | 3.1 | %
Volatility |  |  |  |  |  | N/A |  |  |  |  |  |  |  | 45 | % |  |  |  |  |  |  | 45 | % |  |  |  |  |  |  | 45 | %
Dividend yield |  |  |  |  |  | N/A |  |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | %
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 0.5 |  | - |  | 2.0 |  |  |  | 0.5 |  | - |  | 2.0 |  |  |  | 0.5 |  | - |  | 2.0 |  |  |  | 0.5 |  | - |  | 2.0 |
Risk-free interest rate |  |  | 1.7 | % | - |  | 1.9 | % |  |  | 2.3 | % | - |  | 2.8 | % |  |  | 1.7 | % | - |  | 2.5 | % |  |  | 2.0 | % | - |  | 2.8 | %
Volatility |  |  | 34 | % | - |  | 47 | % |  |  | 40 | % | - |  | 48 | % |  |  | 34 | % | - |  | 55 | % |  |  | 37 | % | - |  | 50 | %
Dividend yield |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | %

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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 http://asc.fasb.org/extlink&oid=116856206&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 http://asc.fasb.org/extlink&oid=116856206&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 http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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