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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of equity incentive program | A summary of our equity incentive program is as follows (in thousands):
| March 31, 2021
Common stock shares available for grant | 3,271 |
Stock options outstanding | 521 |
PSUs outstanding | 250 |
RSUs outstanding | 565 |
RSAs outstanding | 130 |
Summary of time-based stock options | The following summarizes activities for the time-based stock options for the three months ended March 31, 2021 (in thousands except for weighted average exercise price per share and weighted average remaining contractual life data):
| Number of Shares Underlying Stock Options |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2020 | 828 |  |  | $ | 8.16 |  |  | 4.36 |  | $ | 2,628 |
Granted | — |  |  | $ | — |  |  |  |  |
Exercised | (307) |  |  | $ | 8.87 |  |  |  |  |
Canceled or expired | — |  |  | $ | — |  |  |  |  |
Outstanding at March 31, 2021 | 521 |  |  | $ | 7.74 |  |  | 5.21 |  | $ | 1,020 |
Vested and expected to vest at March 31, 2021 | 447 |  |  | $ | 7.76 |  |  | 5.18 |  | $ | 866 |
Exercisable at March 31, 2021 | 129 |  |  | $ | 8.32 |  |  | 4.69 |  | $ | 212 |
Summary of restricted stock units activities | The following summarizes RSU activities for the three months ended March 31, 2021 (in thousands except for weighted average grant date fair value and weighted average remaining contractual life data):
| Number of Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2020 | 802 |  |  | $ | 6.98 |  |  | 1.00 |  | $ | 9,057 |
Granted | — |  |  | $ | — |  |  |  |  |
Released | (227) |  |  | $ | 7.49 |  |  |  |  |
Forfeited | (10) |  |  | $ | 6.74 |  |  |  |  |
Outstanding at March 31, 2021 | 565 |  |  | $ | 6.78 |  |  | 1.08 |  | $ | 5,415 |
Summary of restricted stock awards activities | The following summarizes RSA activities for the three months ended March 31, 2021 (in thousands except for weighted average grant date fair value and weighted average remaining recognition period):
| Number of Restricted Stock Awards |  | Weighted Average Grant Date Fair Value |  | Weighted Average Remaining Recognition Period (Years)
Outstanding at December 31, 2020 | 130 |  |  | $ | 6.53 |  |  | 0.45
Granted | — |  |  | $ | — |  |  |
Released | — |  |  | $ | — |  |  |
Forfeited | — |  |  | $ | — |  |  |
Outstanding at March 31, 2021 | 130 |  |  | $ | 6.53 |  |  | 0.20
Summary of stock-based compensation expenses | The following table summarizes stock-based compensation expenses recognized for the three months ended March 31, 2021 and 2020 (in thousands):
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Stock options | $ | 15 |  |  | $ | 255 |  |  |  |  |
RSUs and RSAs | 497 |  |  | 462 |  |  |  |  |
Employee stock purchase plan | 19 |  |  | 12 |  |  |  |  |
Total | $ | 531 |  |  | $ | 729 |  |  |  |  |
Sales and marketing | $ | 224 |  |  | $ | 45 |  |  |  |  |
Research and development | 318 |  |  | 168 |  |  |  |  |
General and administrative | (11) |  |  | 516 |  |  |  |  |
Total | $ | 531 |  |  | $ | 729 |  |  |  |  |
Summary of assumptions used to value options granted | The assumptions used to value options granted under our equity incentive program are as follows:
| Three Months Ended March 31, |  |
| 2021 (1) |  | 2020 |  |  |  |
Expected life (in years) | N/A |  | 4.2 |  |  |  |
Volatility | N/A |  | 52 | % |  |  |  |
Interest rate | N/A |  | 1.0 | % |  |  |  |
Dividend yield | N/A |  | — | % |  |  |  |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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