STOCK-BASED COMPENSATION (Tables)
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9 Months Ended |
Sep. 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 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 |
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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 | (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 |
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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 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 |
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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 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 | % |
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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 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 | % |
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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 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% |
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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 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 |
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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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