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Equity Incentive Plans and Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock-based Compensation | A summary of our stock-based compensation expense is as follows (in thousands):
| Three Months Ended March 31,
| 2017 |  | 2016
Stock-based compensation by type of award: |  |  |
Stock options | $ | 819 |  |  | $ | 1,100 |
Stock awards | 2,949 |  |  | 2,960 |
Employee stock purchase plan | 548 |  |  | 552 |
| $ | 4,316 |  |  | $ | 4,612 |
Stock-based compensation by category of expense: |  |  |
Cost of revenue | $ | 283 |  |  | $ | 365 |
Sales and marketing | 1,536 |  |  | 2,085 |
Research and development | 1,664 |  |  | 1,431 |
General and administrative | 833 |  |  | 731 |
| $ | 4,316 |  |  | $ | 4,612 |
Stock Options Valuation Assumptions |
| Three Months Ended March 31,
| 2017 |  | 2016
Expected term (in years) | * |  | 4.9
Risk-free interest rate | * |  | 1.42%
Volatility | * |  | 49%
Dividend rate | * |  | —%
__________________________________________ * We did not grant stock options during the three months ended March 31, 2017.
Summary of Activity under Stock Option Plans | The following tables summarize our stock option activities and related information:
| Number of Shares (thousands) |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value (thousands)
Outstanding as of December 31, 2016 | 7,868 |  |  | $ | 4.82 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |  |
Exercised | (728 | ) |  | $ | 2.84 |  |  |  |  |
Canceled (1) | (120 | ) |  | $ | 6.82 |  |  |  |  |  |
Outstanding as of March 31, 2017 | 7,020 |  |  | $ | 5.00 |  |  | 6.2 |  | $ | 30,187 |
Vested and exercisable as of March 31, 2017 | 5,247 |  |  | $ | 4.87 |  |  | 5.6 |  | $ | 23,268 |
__________________________________________
(1) | Includes 49,000 shares of canceled stock options from the 2008 Plan that were added to the 2014 Plan.
Stock Option Information | The following table provides information pertaining to our stock options (in thousands, except weighted-average fair value):
| Three Months Ended March 31,
| 2017 |  | 2016
Fair value of options granted | * |  | $ | 1,603 |
Weighted-average fair value of options granted | * |  | $ | 2.38 |
Intrinsic value of options exercised | $ | 4,708 |  |  | $ | 421 |
__________________________________________ * We did not grant stock options during the three months ended March 31, 2017.
Summary of Restricted Stock Units Activity | The following table summarizes our stock award activities and related information:
| Number of Shares (thousands) |  | Weighted-Average Grant Date Fair Value |  | Weighted-Average Remaining Vesting Term (years) |  | Aggregate Intrinsic Value (thousands)
Outstanding as of December 31, 2016 | 5,959 |  |  | $ | 5.81 |  |  |  |  |
Granted | 1,092 |  |  | $ | 9.24 |  |  |  |  |
Released | (657 | ) |  | $ | 5.68 |  |  |  |  |
Canceled | (247 | ) |  | $ | 6.78 |  |  |  |  |
Outstanding as of March 31, 2017 | 6,147 |  |  | $ | 6.40 |  |  | 1.7 |  | $ | 56,249 |

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