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Equity Award Plans (Tables) | 9 Months Ended
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Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock-based Compensation | The following is a summary of stock-based compensation for stock-based awards granted under the 2014 Plan, the 2008 Plan, and employee stock purchases under the 2014 Purchase Plan recognized during the three and nine months ended September 30, 2015 and 2014 (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Stock-based compensation by type of award: |  |  |  |  |  |  |
Stock options | $ | 1,347 |  |  | $ | 1,615 |  |  | $ | 4,326 |  |  | $ | 5,012 |
Restricted stock units | 2,412 |  |  | 929 |  |  | 6,477 |  |  | 965 |
Employee stock purchase plan | 849 |  |  | 994 |  |  | 2,443 |  |  | 2,337 |
Total stock-based compensation | $ | 4,608 |  |  | $ | 3,538 |  |  | $ | 13,246 |  |  | $ | 8,314 |
Stock-based compensation by category of expense: |  |  |  |  |  |  |
Cost of revenue | $ | 428 |  |  | $ | 277 |  |  | $ | 1,241 |  |  | $ | 578 |
Sales and marketing | 2,093 |  |  | 1,700 |  |  | 6,032 |  |  | 4,041 |
Research and development | 1,489 |  |  | 1,139 |  |  | 4,347 |  |  | 2,546 |
General and administrative | 598 |  |  | 422 |  |  | 1,626 |  |  | 1,149 |
| $ | 4,608 |  |  | $ | 3,538 |  |  | $ | 13,246 |  |  | $ | 8,314 |
Summary of Activity under Stock Option Plans | The following table summarizes our stock option activity and related information as of and for the nine months ended September 30, 2015 (in thousands, except for years and per share amounts):
| Number of Shares Underlying Outstanding Options |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding as of December 31, 2014 | 11,084 |  |  | $ | 5.18 |  |  | 7.9 |  |
Granted | 408 |  |  | $ | 4.84 |  |  |  |  |  |
Exercised | (535 | ) |  | $ | 2.93 |  |  |  |  |  |
Canceled (1) | (922 | ) |  | $ | 7.27 |  |  |  |  |  |
Outstanding as of September 30, 2015 | 10,035 |  |  | $ | 5.10 |  |  | 7.4 |  | $ | 17,394 |
Vested and expected to vest as of September 30, 2015 | 9,633 |  |  | $ | 5.06 |  |  | 7.3 |  | $ | 16,950 |
Vested and exercisable as of September 30, 2015 | 5,592 |  |  | $ | 4.27 |  |  | 6.3 |  | $ | 13,179 |
Stock Option Information | The following table provides information pertaining to our stock options for the nine months ended September 30, 2015 and 2014 (in thousands, except weighted-average fair values):
| Nine Months Ended September 30,
| 2015 |  | 2014
Total fair value of options granted | $ | 869 |  |  | $ | 7,536 |
Weighted average fair value of options granted | $ | 2.13 |  |  | $ | 5.96 |
Intrinsic value of options exercised | $ | 1,535 |  |  | $ | 13,900 |
Stock Options Valuation Assumptions | The estimated grant-date fair value of our stock options issued to employees was calculated using the Black-Scholes option-pricing model, based on the following assumptions:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Expected term (in years) | n/a |  | n/a |  | 4.80 |  | 5.5
Risk-free interest rate | n/a |  | n/a |  | 1.60% |  | 1.73%
Expected volatility | n/a |  | n/a |  | 50% |  | 47%
Dividend rate | n/a |  | n/a |  | —% |  | —%
Summary of Restricted Stock Units Activity | A summary of RSUs activities for the nine months ended September 30, 2015, is as follows (in thousands, except years and per share amounts):
| Number of Shares |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Service Period (in years) |  | Aggregated Intrinsic Value
Outstanding as of December 31, 2014 | 2,388 |  |  | $ | 8.97 |  |  |  |  |
Granted | 1,256 |  |  | $ | 5.48 |  |  |  |  |
Released | (713 | ) |  | $ | 10.82 |  |  |  |  |
Canceled | (359 | ) |  | $ | 9.19 |  |  |  |  |
Outstanding as of September 30, 2015 | 2,572 |  |  | $ | 6.72 |  |  | 1.7 |  | $ | 15,409 |
Summary of Valuation Assumptions | The fair value of the option component of the 2014 Purchase Plan shares was determined at the grant date using the Black-Scholes option pricing model with the following weighted average assumptions:
| Three and Nine Months Ended September 30,
| 2015 |  | 2014
Expected term (in years) | 1.2 |  | 1.4
Risk-free interest rate | 0.32% |  | 0.24%
Expected volatility | 40% |  | 31%
Dividend rate | —% |  | —%

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