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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of equity incentive program | A summary of the Company's equity incentive program is as follows (in thousands):
| December 31, 2019
Common stock shares available for grant | 4,214 |
Standard and market condition-based stock options outstanding | 967 |
RSAs outstanding | 91 |
RSUs outstanding | 945 |
Summary of time-based stock options | The following summarizes activities for the time-based stock options for the year ended December 31, 2019:
| Number of Shares Underlying Stock Options (in thousands) |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2018 | 1,862 |  |  | $ | 9.44 |  |  | 2.85 |  | $ | 751 |
Granted | 783 |  |  | $ | 8.25 |  |  |  |  |
Exercised | (174 | ) |  | $ | 7.15 |  |  |  |  |
Canceled or expired | (1,504 | ) |  | $ | 9.65 |  |  |  |  |
Outstanding as of December 31, 2019 | 967 |  |  | $ | 8.55 |  |  | 5.63 |  | $ | 16 |
Vested and expected to vest at December 31, 2019 | 967 |  |  | $ | 8.55 |  |  | 5.63 |  | $ | 16 |
Exercisable at December 31, 2019 | 161 |  |  | $ | 9.80 |  |  | 2.12 |  | $ | 0.4 |
Summary of restricted stock units activities | The following summarizes RSUs activities for the year ended December 31, 2019:
| Number of Restricted Stock Units (in thousands) |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2018 | 1,091 |  |  | $ | 10.97 |  |  | 0.67 |  | $ | 9,773 |
Granted | 892 |  |  | $ | 8.54 |  |  |  |  |
Released | (714 | ) |  | $ | 11.30 |  |  |  |  |
Forfeited | (324 | ) |  | $ | 9.85 |  |  |  |  |
Outstanding at December 31, 2019 | 945 |  |  | $ | 8.81 |  |  | 1.25 |  | $ | 7,020 |
Summary of restricted stock awards activities | The following summarizes RSA activities for the year ended December 31, 2019:
| Number of Restricted Stock Awards (in thousands) |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Recognition Period (Years)
Outstanding at December 31, 2018 | 55 |  |  | $ | 13.02 |  |  | 0.46
Granted | 114 |  |  | $ | 7.60 |  |  |
Released | (62 | ) |  | $ | 12.63 |  |  |
Forfeited | (16 | ) |  | $ | 7.27 |  |  |
Outstanding at December 31, 2019 | 91 |  |  | $ | 7.45 |  |  | 0.45
Summary of stock-based compensation expenses | The stock-based compensation related to all of our stock-based awards and ESPP for the years ended December 31, 2019, 2018 and 2017 is as follows (in thousands):
| For the Years Ended December 31,
| 2019 |  | 2018 |  | 2017
Stock options | $ | 701 |  |  | $ | 1,222 |  |  | $ | 3,735 |
RSUs and RSAs | 4,692 |  |  | 7,372 |  |  | 2,234 |
Employee stock purchase plan | 71 |  |  | 92 |  |  | $ | 133 |
Total | $ | 5,464 |  |  | $ | 8,686 |  |  | $ | 6,102 |
Sales and marketing | $ | 947 |  |  | $ | 946 |  |  | $ | 1,025 |
Research and development | 1,304 |  |  | 1,948 |  |  | 981 |
General and administrative | 3,213 |  |  | 5,792 |  |  | 4,096 |
Total | $ | 5,464 |  |  | $ | 8,686 |  |  | $ | 6,102 |
Summary of assumptions used to value option grants | The assumptions used to value options granted under the Company’s equity incentive program are as follows:
Time-based stock options: |  |  |  |  |
| For the Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Expected life (in years) | 4.4 |  |  | 4.4 |  |  | 4.6 |
Volatility | 53 | % |  | 55 | % |  | 52 | %
Interest rate | 2.0 | % |  | 3.0 | % |  | 2.0 | %
Dividend yield | — |  |  | — |  |  | — |
Market condition based stock options: |  |  |  |  |
| For the Years Ended December 31,
| 2019 (1) |  | 2018 (1) |  | 2017
Expected life (in years) | N/A |  | N/A |  | 7.0 |
Volatility | N/A |  | N/A |  | 55 | %
Interest rate | N/A |  | N/A |  | 2.0 | %
Dividend yield | N/A |  | N/A |  | — | %
(1) No market condition based stock options were granted during the years ended December 31, 2019 and 2018

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