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Stock-Based Compensation (Tables) | 3 Months Ended
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Apr. 30, 2020
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, 2020 |  |  | 8,772,585 |  |  | $ | 9.48 |  |  |  | 4.27 |  |  | $ | 60,221 |
Options granted |  |  | 31,666 |  |  |  | 12.48 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (222,426 | ) |  |  | 4.34 |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (24,250 | ) |  |  | 17.85 |  |  |  |  |  |  |  |  |
Balance as of April 30, 2020 |  |  | 8,557,575 |  |  | $ | 9.60 |  |  |  | 4.08 |  |  | $ | 64,061 |
Vested and expected to vest as of April 30, 2020 |  |  | 8,484,725 |  |  | $ | 9.52 |  |  |  | 4.05 |  |  | $ | 64,056 |
Exercisable as of April 30, 2020 |  |  | 7,036,704 |  |  | $ | 7.44 |  |  |  | 3.19 |  |  | $ | 63,949 |
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, 2020 |  |  | 21,808,107 |  |  | $ | 18.85 |
Granted |  |  | 7,313,474 |  |  |  | 14.53 |
Vested, net of shares withheld for employee payroll taxes |  |  | (1,330,535 | ) |  |  | 18.66 |
Forfeited/cancelled |  |  | (884,977 | ) |  |  | 19.78 |
Unvested balance - April 30, 2020 |  |  | 26,906,069 |  |  | $ | 17.65 |
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, |
|  | 2020 |  |  | 2019 |
Cost of revenue |  | $ | 4,541 |  |  | $ | 3,611 |
Research and development |  |  | 17,287 |  |  |  | 12,975 |
Sales and marketing |  |  | 10,079 |  |  |  | 9,400 |
General and administrative |  |  | 8,136 |  |  |  | 6,376 |
Total stock-based compensation |  | $ | 40,043 |  |  | $ | 32,362 |
Schedule Of Share Based Payment Award Employee Stock Options And Employee Stock Purchase Plan Valuation Assumptions [Table Text Block] | 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 |
|  | April 30, |
|  | 2020 |  |  | 2019 |
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  |  |  |  |  | 5.8 |  |  |  |  |  |  | N/A |
Risk-free interest rate |  |  |  |  |  |  | 0.6 | % |  |  |  |  |  | N/A |
Volatility |  |  |  |  |  |  | 46 | % |  |  |  |  |  | N/A |
Dividend yield |  |  |  |  |  |  | 0 | % |  |  |  |  |  | N/A |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 0.5 |  | - |  | 2.0 |  |  |  | 0.5 |  | - |  | 2.0 |
Risk-free interest rate |  |  | 0.3 | % | - |  | 0.4 | % |  |  | 2.4 | % | - |  | 2.5 | %
Volatility |  |  | 44 | % | - |  | 52 | % |  |  | 46 | % | - |  | 55 | %
Dividend yield |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | %

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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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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