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Employee Incentive Plans (Tables) | 6 Months Ended
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Jul. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Stock-based Compensation Expense by Statement of Operations Location | Stock-based compensation expense was recorded in the following cost and expense categories in the Company’s condensed consolidated statements of operations (in thousands):
| Three Months Ended July 31, |  | Six Months Ended July 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (unaudited) |  |  |  |
Cost of revenue |  |  |  |  |  |  |
Subscription | $ | 1,901 |  |  | $ | 1,056 |  |  | $ | 3,430 |  |  | $ | 1,742 |
Professional services and other | 1,083 |  |  | 738 |  |  | 1,972 |  |  | 1,207 |
Research and development | 5,272 |  |  | 4,438 |  |  | 9,485 |  |  | 7,739 |
Sales and marketing | 5,471 |  |  | 3,021 |  |  | 9,624 |  |  | 5,396 |
General and administrative | 4,495 |  |  | 2,725 |  |  | 7,846 |  |  | 4,800 |
Total | $ | 18,222 |  |  | $ | 11,978 |  |  | $ | 32,357 |  |  | $ | 20,884 |
Schedule of Shares of Common Stock Reserved for Future Issuance | Shares of common stock reserved for future issuance are as follows:
| As of
| July 31, 2018
| (unaudited)
Stock options and unvested RSUs outstanding | 25,789,276 |
Available for future stock option and RSU grants | 12,464,154 |
Available for ESPP | 3,035,697 |
| 41,289,127 |
Schedule of Stock Option Activity | A summary of the Company’s stock option activity and related information is as follows:
| Number of Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in thousands)
Outstanding as of January 31, 2018 | 24,917,045 |  |  | $ | 7.37 |  |  | 7.6 |  | $ | 550,173 |
Granted | 684,500 |  |  | 39.21 |  |  |  |  |
Exercised | (4,025,395 | ) |  | 5.23 |  |  |  |  |
Canceled | (677,660 | ) |  | 8.41 |  |  |  |  |
Outstanding as of July 31, 2018 (unaudited) | 20,898,490 |  |  | $ | 8.79 |  |  | 7.4 |  | $ | 853,892 |
As of July 31, 2018 |  |  |  |  |  |  |
Vested and exercisable (unaudited) | 9,797,292 |  |  | $ | 6.35 |  |  | 6.8 |  | $ | 424,203 |
Schedule of Black-Scholes Option Pricing Model Estimated Fair Value Assumptions | The Company used the Black-Scholes option pricing model to estimate the fair value of stock options granted with the following assumptions:
| Three Months Ended July 31, |  | Six Months Ended July 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (unaudited)
Expected volatility | — |  | — |  | 40% |  | 40% - 41%
Expected term (in years) | — |  | — |  | 6.25 |  | 6.0 - 6.4
Risk-free interest rate | — |  | — |  | 2.70% |  | 2.06% - 2.21%
Expected dividend yield | — |  | — |  | — |  | —
The Company estimated the fair value of ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions:
| Three Months Ended July 31, |  | Six Months Ended July 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (unaudited)
Expected volatility | 39% - 40% |  | 32% - 34% |  | 39% - 40% |  | 32% - 37%
Expected term (in years) | 0.5 - 1.0 |  | 0.5 - 1.0 |  | 0.5 - 1.0 |  | 0.5 - 1.2
Risk-free interest rate | 2.12% - 2.34% |  | 1.12% - 1.22% |  | 2.12% - 2.34% |  | 0.95% - 1.22%
Expected dividend yield | — |  | — |  | — |  | —
Schedule of Nonvested Restricted Stock Units Activity | A summary of the Company’s RSU activity and related information is as follows:
| Number of RSUs |  | Weighted- Average Grant Date Fair Value Per Share
Outstanding as of January 31, 2018 | 2,862,929 |  |  | $ | 24.38 |
Granted | 2,752,588 |  |  | 50.67 |
Vested | (542,969 | ) |  | 22.71 |
Forfeited | (181,762 | ) |  | 29.39 |
Outstanding as of July 31, 2018 (unaudited) | 4,890,786 |  |  | $ | 39.17 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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