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Stock-Based Compensation (Tables) | 12 Months Ended
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Jan. 31, 2016
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 |  |  |  |  |
|  | Shares Subject to |  |  | Weighted- |  |  | Remaining |  |  |  |  |
|  | Outstanding |  |  | Average Exercise |  |  | Contractual Life |  |  | Aggregate |
|  | Options |  |  | Price |  |  | (Years) |  |  | Intrinsic Value |
|  |  |  |  |  |  |  |  |  |  |  |  |  | (in thousands) |
Balance as of January 31, 2014 |  |  | 18,427,075 |  |  | $ | 3.65 |  |  |  | 8.45 |  |  | $ | 191,809 |
Options granted |  |  | 2,918,632 |  |  |  | 15.73 |  |  |  |  |  |  |  |  |
Option exercised |  |  | (2,306,816 | ) |  |  | 2.61 |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (1,573,320 | ) |  |  | 5.22 |  |  |  |  |  |  |  |  |
Balance as of January 31, 2015 |  |  | 17,465,571 |  |  | $ | 5.67 |  |  |  | 7.80 |  |  | $ | 229,713 |
Options granted |  |  | 1,898,700 |  |  |  | 15.62 |  |  |  |  |  |  |  |  |
Option exercised |  |  | (2,196,516 | ) |  |  | 3.26 |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (1,533,237 | ) |  |  | 8.67 |  |  |  |  |  |  |  |  |
Balance as of January 31, 2016 |  |  | 15,634,518 |  |  | $ | 6.92 |  |  |  | 7.12 |  |  | $ | 82,541 |
Vested and expected to vest as of January 31, 2016 |  |  | 15,398,572 |  |  | $ | 6.84 |  |  |  | 7.10 |  |  | $ | 82,076 |
Exercisable as of January 31, 2016 |  |  | 9,587,096 |  |  | $ | 4.14 |  |  |  | 6.42 |  |  | $ | 68,926 |
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, 2014 |  |  | 225,300 |  |  | $ | 14.06 |
Granted |  |  | 5,091,479 |  |  |  | 15.77 |
Vested, net of shares withheld for employee payroll taxes |  |  | (37,991 | ) |  |  | 14.53 |
Forfeited/cancelled, including shares withheld for employee payroll taxes |  |  | (339,079 | ) |  |  | 16.42 |
Unvested balance - January 31, 2015 |  |  | 4,939,709 |  |  | $ | 15.66 |
Granted |  |  | 6,052,788 |  |  |  | 15.69 |
Vested, net of shares withheld for employee payroll taxes |  |  | (982,140 | ) |  |  | 16.12 |
Forfeited/cancelled, including shares withheld for employee payroll taxes |  |  | (1,805,389 | ) |  |  | 16.07 |
Unvested balance - January 31, 2016 |  |  | 8,204,968 |  |  | $ | 15.54 |
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):
|  | Year Ended |
|  | January 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Cost of revenue |  | $ | 4,664 |  |  | $ | 1,492 |  |  | $ | 450 |
Research and development |  |  | 24,696 |  |  |  | 11,767 |  |  |  | 3,154 |
Sales and marketing |  |  | 19,530 |  |  |  | 11,616 |  |  |  | 5,017 |
General and administrative |  |  | 10,614 |  |  |  | 7,054 |  |  |  | 3,128 |
Total stock-based compensation |  | $ | 59,504 |  |  | $ | 31,929 |  |  | $ | 11,749 |
Summary of Estimated Fair Value of Employee Stock Options | We estimated the fair value of employee stock options and ESPP purchase rights using a Black-Scholes option pricing model with the following assumptions:
|  | Year Ended |
|  | January 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 5.5 |  | – |  | 6.1 |  |  |  | 5.7 |  | – |  | 6.2 |  |  |  | 4.9 |  | – |  | 6.3 |
Risk-free interest rate |  |  | 1.5 | % | – |  | 1.9 | % |  |  | 1.8 | % | – |  | 2.1 | % |  |  | 0.8 | % | – |  | 1.9 | %
Volatility |  |  | 42 | % | – |  | 44 | % |  |  | 45 | % | – |  | 49 | % |  |  | 48 | % | – |  | 57 | %
Dividend yield |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | %
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  | 0.5 |  | – |  | 2.0 |  |  |  | 0.6 |  | – |  | 2.1 |  |  |  |  |  |  |  | — |
Risk-free interest rate |  |  | 0.2 | % | – |  | 0.8 | % |  |  | 0.1 | % | – |  | 0.6 | % |  |  |  |  |  |  | — |
Volatility |  |  | 33 | % | – |  | 41 | % |  |  | 37 | % | – |  | 41 | % |  |  |  |  |  |  | — |
Dividend yield |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | 0 | % |  |  |  |  |  |  | — |
Restricted Stock Awards |
Summary of Restricted Stock Award Activity Under Equity Incentive Plans and Related Information | The following table summarizes the restricted stock awards activity under the equity incentive plans and related information:
|  | Number of |  |  | Weighted- |
|  | Restricted |  |  | Average |
|  | Stock |  |  | Grant Date |
|  | Outstanding |  |  | Fair Value |
Unvested balance - January 31, 2014 |  |  | 387,435 |  |  | $ | 7.84 |
Granted |  |  | 26,802 |  |  |  | 17.27 |
Vested, net of shares withheld for employee payroll taxes |  |  | (213,512 | ) |  |  | 7.86 |
Forfeited/cancelled, including shares withheld for employee payroll taxes |  |  | (28,064 | ) |  |  | 5.85 |
Unvested balance - January 31, 2015 |  |  | 172,661 |  |  | $ | 9.60 |
Granted |  |  | 28,864 |  |  |  | 17.54 |
Vested, net of shares withheld for employee payroll taxes |  |  | (102,619 | ) |  |  | 11.79 |
Forfeited/cancelled, including shares withheld for employee payroll taxes |  |  | (68,299 | ) |  |  | 8.87 |
Unvested balance - January 31, 2016 |  |  | 30,607 |  |  | $ | 11.38 |

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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=6415400&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=6415400&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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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