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Stock-Based Compensation (Tables) | 3 Months Ended
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Apr. 30, 2018
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, 2018 |  |  | 10,843,120 |  |  | $ | 8.32 |  |  |  | 5.74 |  |  | $ | 150,922 |
Options granted |  |  | 650,000 |  |  |  | 20.28 |  |  |  |  |  |  |  |  |
Option exercised |  |  | (631,210 | ) |  |  | 6.92 |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (283,185 | ) |  |  | 13.67 |  |  |  |  |  |  |  |  |
Balance as of April 30, 2018 |  |  | 10,578,725 |  |  | $ | 9.00 |  |  |  | 5.73 |  |  | $ | 146,660 |
Vested and expected to vest as of April 30, 2018 |  |  | 10,483,748 |  |  | $ | 8.92 |  |  |  | 5.70 |  |  | $ | 146,139 |
Exercisable as of April 30, 2018 |  |  | 8,425,468 |  |  | $ | 6.85 |  |  |  | 4.95 |  |  | $ | 134,858 |
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, 2018 |  |  | 14,619,252 |  |  | $ | 16.42 |
Granted |  |  | 5,211,663 |  |  |  | 20.98 |
Vested, net of shares withheld for employee payroll taxes |  |  | (1,010,888 | ) |  |  | 15.91 |
Forfeited/cancelled |  |  | (838,952 | ) |  |  | 16.18 |
Unvested balance - April 30, 2018 |  |  | 17,981,075 |  |  | $ | 17.79 |
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 |
|  | April 30, |
|  | 2018 |  |  | 2017 |
Cost of revenue |  | $ | 3,121 |  |  | $ | 2,468 |
Research and development |  |  | 10,148 |  |  |  | 9,160 |
Sales and marketing |  |  | 8,061 |  |  |  | 7,740 |
General and administrative |  |  | 5,283 |  |  |  | 3,578 |
Total stock-based compensation |  | $ | 26,613 |  |  | $ | 22,946 |
Summary of Estimated Fair Value of Employee Stock Options | We estimated the fair value of employee stock options and 2015 ESPP purchase rights using a Black-Scholes option pricing model with the following assumption. During the three months ended April 30, 2018, we had no stock option grants awarded using a Black-Scholes option pricing model.
|  | Three Months Ended |  |  |  |  |  |  |
|  | April 30, |  |  |  |  |  |  |  |  |
|  | 2017 |  |  |  |  |  |  |  |  |
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  |  |  |  |  | 6.0 |  |  |  |  |  |  |  |  |
Risk-free interest rate |  |  | 2.1 | % | - |  | 2.4 | % |  |  |  |  |  |  |  |
Volatility |  |  | 39 | % | - |  | 40 | % |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  |  |
|  | Three Months Ended |
|  | April 30, |
Employee Stock Purchase Plan |  | 2018 |  |  | 2017 |
Expected term (in years) |  |  | 0.5 |  | - |  | 2.0 |  |  |  | 0.5 |  | - |  | 2.0 |
Risk-free interest rate |  |  | 2.0 | % | - |  | 2.3 | % |  |  | 0.9 | % | - |  | 1.4 | %
Volatility |  |  | 37 | % | - |  | 50 | % |  |  | 28 | % | - |  | 43 | %
Dividend yield |  |  |  |  |  |  | 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=109197908&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=109197908&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=109197908&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 employee stock purchase plans, including, but not limited to: (a) expected term, (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 http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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