STOCK-BASED COMPENSATION (Tables)
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6 Months Ended |
Jun. 30, 2017 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| 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 June 30, 2017: | | | | | | | Shares Available for Grant | | | Balance, December 31, 2016 | 5,116,753 |
| Authorized | 2,612,263 |
| Options granted | — |
| Options canceled | 905,082 |
| Awards granted | (3,191,974 | ) | Awards canceled | 1,203,643 |
| Balance, June 30, 2017 | 6,645,767 |
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| 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 | (396,865 | ) | | 1.75 |
| | | | | Options canceled | (905,082 | ) | | 7.16 |
| | | | | Balance, June 30, 2017 | 4,917,827 |
| | $ | 6.31 |
| | 5.85 | | $ | 3,694 |
| Options exercisable, June 30, 2017 | 3,743,487 |
| | $ | 6.11 |
| | 5.15 | | $ | 3,689 |
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| Summary of RSU activity and related information |
summary of the Company’s RSU activity and related information for the three months ended June 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 | 3,191,974 |
| | 4.97 |
| Awards vested | (970,734 | ) | | 5.09 |
| Awards canceled | (1,108,066 | ) | | 6.20 |
| Balance, June 30, 2017 | 5,478,844 |
| | $ | 5.55 |
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| Summary of the assumptions related to stock options |
Weighted-average assumptions for the Company's stock options granted were as follows: | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | 2017 | | 2016 | | 2017 | | 2016 | Stock options: | | | | | | | | Expected term (in years) | N/A | | 5.77 |
| | N/A | | 5.78 |
| Expected volatility | N/A | | 55.11 | % | | N/A | | 55.16 | % | Risk free interest rate | N/A | | 1.50 | % | | N/A | | 1.50 | % |
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| 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 June 30, | | Six Months Ended June 30, | | 2017 | | 2016 | | 2017 | | 2016 | MBRSUs: | | | | | | | | Expected volatility | 46 | % | | 53 | % | | 46 | % | | 53 | % | Risk free interest rate | 1.45 | % | | 1.07 | % | | 1.45 | % | | 1.07 | % |
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| 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 June 30, | | Six Months Ended June 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% |
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| 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 June 30, | | Six Months Ended June 30, | | 2017 | | 2016 | | 2017 | | 2016 | | (in thousands) | Cost of revenue | $ | 276 |
| | $ | 321 |
| | $ | 547 |
| | $ | 593 |
| Research and development | 1,065 |
| | 1,366 |
| | 1,753 |
| | 2,711 |
| Sales and marketing | 1,501 |
| | 2,063 |
| | 2,795 |
| | 3,831 |
| General and administrative | 1,602 |
| | 1,704 |
| | 2,902 |
| | 3,215 |
| Total stock-based compensation | $ | 4,444 |
| | $ | 5,454 |
| | $ | 7,997 |
| | $ | 10,350 |
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The following table presents stock-based compensation expense by award-type: | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | 2017 | | 2016 | | 2017 | | 2016 | | (in thousands) | Stock Options | $ | 820 |
| | $ | 1,185 |
| | $ | 1,703 |
| | $ | 2,331 |
| Restricted Stock Units | 3,193 |
| | 3,544 |
| | 5,463 |
| | 6,691 |
| Employee Stock Purchase Plan | 431 |
| | 725 |
| | 831 |
| | 1,328 |
| Total stock-based compensation | $ | 4,444 |
| | $ | 5,454 |
| | $ | 7,997 |
| | $ | 10,350 |
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