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Stock-Based Compensation (Tables) | 6 Months Ended
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Jul. 31, 2017
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, 2017 |  |  | 12,318,800 |  |  | $ | 7.44 |  |  |  | 6.42 |  |  | $ | 119,606 |
Options granted |  |  | 1,133,056 |  |  |  | 16.91 |  |  |  |  |  |  |  |  |
Option exercised |  |  | (930,595 | ) |  |  | 5.82 |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (784,749 | ) |  |  | 15.26 |  |  |  |  |  |  |  |  |
Balance as of July 31, 2017 |  |  | 11,736,512 |  |  | $ | 7.96 |  |  |  | 6.12 |  |  | $ | 127,825 |
Vested and expected to vest as of July 31, 2017 |  |  | 11,628,379 |  |  | $ | 7.90 |  |  |  | 6.10 |  |  | $ | 127,359 |
Exercisable as of July 31, 2017 |  |  | 9,164,951 |  |  | $ | 6.11 |  |  |  | 5.49 |  |  | $ | 116,739 |
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, 2017 |  |  | 11,822,316 |  |  | $ | 14.67 |
Granted |  |  | 5,260,434 |  |  |  | 17.57 |
Vested, net of shares withheld for employee payroll taxes |  |  | (1,297,031 | ) |  |  | 13.68 |
Forfeited/cancelled, including shares withheld for employee payroll taxes |  |  | (1,603,930 | ) |  |  | 14.38 |
Unvested balance - July 31, 2017 |  |  | 14,181,789 |  |  | $ | 15.87 |
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):
|  | Three Months Ended |  |  | Six Months Ended |
|  | July 31, |  |  | July 31, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Cost of revenue |  | $ | 2,663 |  |  | $ | 1,830 |  |  | $ | 5,131 |  |  | $ | 3,342 |
Research and development |  |  | 9,554 |  |  |  | 7,348 |  |  |  | 18,714 |  |  |  | 13,872 |
Sales and marketing |  |  | 7,934 |  |  |  | 6,416 |  |  |  | 15,674 |  |  |  | 11,646 |
General and administrative |  |  | 3,916 |  |  |  | 3,470 |  |  |  | 7,494 |  |  |  | 6,293 |
Total stock-based compensation |  | $ | 24,067 |  |  | $ | 19,064 |  |  | $ | 47,013 |  |  | $ | 35,153 |
Summary of Estimated Fair Value of Employee Stock Options | We estimated the fair value of employee stock options and 2015 ESPP purchase rights using generally a Black-Scholes option pricing model with the following assumptions:
|  | Three Months Ended |  |  | Six Months Ended |
|  | July 31, |  |  | July 31, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 5.5 |  | - |  | 6.0 |  |  |  | 5.5 |  | - |  | 6.0 |  |  |  | 5.5 |  | - |  | 6.0 |  |  |  | 5.5 |  | - |  | 6.0 |
Risk-free interest rate |  |  | 1.8 | % | - |  | 2.0% |  |  |  | 1.3 | % | - |  | 1.5% |  |  |  | 1.8 | % | - |  | 2.4% |  |  |  | 1.3 | % | - |  | 1.5% |
Volatility |  |  | 38 | % | - |  | 39% |  |  |  |  |  |  |  | 43% |  |  |  | 38 | % | - |  | 40% |  |  |  |  |  |  |  | 43% |
Dividend yield |  |  |  |  |  |  | 0% |  |  |  |  |  |  |  | 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 |  |  | 0.9 | % | - |  | 1.4% |  |  |  | 0.5 | % | - |  | 0.9% |  |  |  | 0.9 | % | - |  | 1.4% |  |  |  | 0.5 | % | - |  | 0.9% |
Volatility |  |  | 28 | % | - |  | 43% |  |  |  | 46 | % | - |  | 60% |  |  |  | 28 | % | - |  | 43% |  |  |  | 46 | % | - |  | 60% |
Dividend yield |  |  |  |  |  |  | 0% |  |  |  |  |  |  |  | 0% |  |  |  |  |  |  |  | 0% |  |  |  |  |  |  |  | 0% |

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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 of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&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://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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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