v3.8.0.1

STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summary of total shares available for grant | The following table summarizes the total number of shares available for grant under the 2014 Plan as of September 30, 2017:
| Shares Available for Grant
Balance, December 31, 2016 | 5,116,753 |
Authorized | 2,612,263 |
Options granted | — |
Options canceled | 1,436,112 |
Awards granted | (3,287,665 | )
Awards canceled | 1,595,966 |
Balance, September 30, 2017 | 7,473,429 |
Summary of shares available for grant and outstanding stock option activity | The following table summarizes the information about outstanding stock option activity:
| Options Outstanding
| Number of Shares Underlying Outstanding Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
|  |  |  |  |  |  | (in thousands)
Balance, December 31, 2016 | 6,219,774 |  |  | $ | 6.15 |  |  | 6.42 |  | $ | 6,056 |
Options granted | — |  |  | — |  |  |  |  |
Options exercised | (409,065 | ) |  | 1.73 |  |  |  |  |
Options canceled | (1,436,112 | ) |  | 7.74 |  |  |  |  |
Balance, September 30, 2017 | 4,374,597 |  |  | $ | 6.04 |  |  | 6.07 |  | $ | 2,732 |
Options exercisable, September 30, 2017 | 3,439,751 |  |  | $ | 5.81 |  |  | 5.57 |  | $ | 2,732 |
Summary of RSU activity and related information | summary of the Company’s RSU activity and related information for the three months ended September 30, 2017:
| Restricted Stock Units Outstanding
| Shares |  | Weighted-Average Grant-Date Fair Value Per Share
Balance, December 31, 2016 | 4,365,670 |  |  | $ | 6.23 |
Awards granted | 3,287,665 |  |  | 4.96 |
Awards vested | (1,453,616 | ) |  | 5.92 |
Awards canceled | (1,320,044 | ) |  | 6.14 |
Balance, September 30, 2017 | 4,879,675 |  |  | $ | 5.49 |
Summary of the assumptions related to stock options | Weighted-average assumptions for the Company's stock options granted were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Stock options: |  |  |  |  |  |  |
Expected term (in years) | N/A |  | 5.85 |  |  | N/A |  | 5.78 |
Expected volatility | N/A |  | 53.18 | % |  | N/A |  | 55.09 | %
Risk free interest rate | N/A |  | 1.15 | % |  | N/A |  | 1.49 | %
Schedule of share based payment award, equity other than options, valuation [Table Text Block] | Weighted-average assumptions to value MBRSUs under the Monte Carlo model were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
MBRSUs: |  |  |  |  |  |  |
Expected volatility | N/A |  | N/A |  | 46 | % |  | 53 | %
Risk free interest rate | N/A |  | N/A |  | 1.45 | % |  | 1.07 | %
Weighted average assumptions used to value employee stock purchase rights | Weighted-average assumptions to value employee stock purchase rights under the Black-Scholes model were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
ESPP purchase rights: |  |  |  |  |  |  |
Expected term (in years) | 0.50 - 1.00 |  | 0.50 - 2.00 |  | 0.50 - 1.00 |  | 0.50 - 2.00
Expected volatility | 34% - 39% |  | 35% - 55% |  | 34% - 39% |  | 35% - 55%
Risk free interest rate | 0.60% - 1.07% |  | 0.07% - 0.51% |  | 0.60% - 1.07% |  | 0.07% - 0.51%
Schedule of stock-based awards granted in the consolidated statements of operations | The total stock-based compensation the Company recognized for stock-based awards in the consolidated statements of operations is as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Cost of revenue | $ | 313 |  |  | $ | 431 |  |  | $ | 860 |  |  | $ | 1,024 |
Research and development | 1,329 |  |  | 1,576 |  |  | 3,082 |  |  | 4,287 |
Sales and marketing | 1,566 |  |  | 2,505 |  |  | 4,361 |  |  | 6,336 |
General and administrative | 1,756 |  |  | 1,903 |  |  | 4,658 |  |  | 5,118 |
Total stock-based compensation | $ | 4,964 |  |  | $ | 6,415 |  |  | $ | 12,961 |  |  | $ | 16,765 |
The following table presents stock-based compensation expense by award-type:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Stock Options | $ | 652 |  |  | $ | 1,336 |  |  | $ | 2,355 |  |  | $ | 3,667 |
Restricted Stock Units | 3,945 |  |  | 4,353 |  |  | 9,408 |  |  | 11,044 |
Employee Stock Purchase Plan | 367 |  |  | 726 |  |  | 1,198 |  |  | 2,054 |
Total stock-based compensation | $ | 4,964 |  |  | $ | 6,415 |  |  | $ | 12,961 |  |  | $ | 16,765 |

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