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Stock-Based Compensation (Tables) | 3 Months Ended
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Apr. 30, 2015
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, 2015 |  |  | 17,465,571 |  |  | $ | 5.67 |  |  |  | 7.80 |  |  | $ | 229,713 |
Options granted |  |  | 342,980 |  |  |  | 17.54 |  |  |  |  |  |  |  |  |
Option exercised |  |  | (350,096 | ) |  |  | 3.09 |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (563,225 | ) |  |  | 6.92 |  |  |  |  |  |  |  |  |
Balance as of April 30, 2015 |  |  | 16,895,230 |  |  | $ | 5.92 |  |  |  | 7.60 |  |  | $ | 190,236 |
Vested and expected to vest as of April 30, 2015 |  |  | 16,628,973 |  |  | $ | 5.85 |  |  |  | 7.58 |  |  | $ | 188,405 |
Exercisable as of April 30, 2015 |  |  | 8,924,686 |  |  | $ | 3.50 |  |  |  | 6.98 |  |  | $ | 121,735 |
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 |
|  | April 30, |
|  | 2015 |  |  | 2014 |
Cost of revenue |  | $ | 851 |  |  | $ | 226 |
Research and development |  |  | 5,263 |  |  |  | 2,008 |
Sales and marketing |  |  | 4,283 |  |  |  | 2,065 |
General and administrative |  |  | 2,318 |  |  |  | 1,453 |
Net loss attributable to common stockholders |  | $ | 12,715 |  |  | $ | 5,752 |
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:
|  | Three Months Ended |
|  | April 30, |
|  | 2015 |  |  | 2014 |
Employee Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 6.0 |  | - |  | 6.1 |  |  | 5.7 | - | 6.1 |
Risk-free interest rate |  |  | 1.6 | % | - |  | 1.7% |  |  |  |  |  | 2.1% |
Volatility |  |  | 43 | % | - |  | 44% |  |  |  |  |  | 49% |
Dividend yield |  |  |  |  |  |  | 0% |  |  |  |  | 0% |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected term (in years) |  | 0.5 |  | - |  | 2.0 |  |  |  |  |  | — |
Risk-free interest rate |  |  | 0.2 | % | - |  | 0.7% |  |  |  |  |  | — |
Volatility |  |  | 39 | % | - |  | 41% |  |  |  |  |  | — |
Dividend yield |  |  |  |  |  |  | 0% |  |  |  |  |  | — |
Restricted Stock Units |
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, 2015 |  |  | 4,939,709 |  |  | $ | 15.66 |
Granted |  |  | 2,673,044 |  |  |  | 17.54 |
Vested, net of shares withheld for employee payroll taxes |  |  | (348,962 | ) |  |  | 17.77 |
Forfeited/cancelled, including shares withheld for employee payroll taxes |  |  | (430,831 | ) |  |  | 17.17 |
Unvested balance - April 30, 2015 |  |  | 6,832,960 |  |  | $ | 16.19 |
Restricted Stock |
Summary of Restricted Stock Award Activity Under Equity Incentive Plans and Related Information | The following table summarizes the restricted stock activity under the equity incentive plans and related information:
|  | Number of |  |  | Weighted- |
|  | Restricted |  |  | Average |
|  | Stock |  |  | Grant Date |
|  | Outstanding |  |  | Fair Value |
Unvested balance - January 31, 2015 |  |  | 172,661 |  |  | $ | 9.60 |
Granted |  |  | 23,364 |  |  |  | 17.54 |
Vested |  |  | (21,516 | ) |  |  | 14.99 |
Forfeited/cancelled, including shares withheld for employee payroll taxes |  |  | (7,790 | ) |  |  | 17.54 |
Unvested balance - April 30, 2015 |  |  | 166,719 |  |  | $ | 9.65 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + 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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- 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=6415400&loc=d3e5070-113901 + Details
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