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8. SHARE-BASED COMPENSATION (Tables) | 3 Months Ended
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Mar. 31, 2023
Disclosure Of Compensation Related Costs Sharebased Payments Abstract |
Schedule of Activity And Positions With Respect To RSUs And PSUs | The following table summarizes activity and positions with respect to RSUs and PSUs for the three months ended March 31, 2023:
|  |  |  |  | Weighted-average |
|  | Shares |  |  | price |
Unvested as of December 31, 2022 |  |  | 8,866,000 |  |  | $ | 3.85 |
Granted |  |  | 161,000 |  |  |  | 2.35 |
Vested |  |  | (458,000 | ) |  |  | 9.12 |
Forfeited |  |  | (191,000 | ) |  |  | 12.71 |
Unvested as of March 31, 2023 |  |  | 8,378,000 |  |  | $ | 3.40 |
During the quarter ended March 31, 2023, we issued 106,000 shares for the partial achievement of internal performance milestones during the fourth quarter of 2022. These shares were valued based on the closing price of our common stock on the dates of grant and vest quarterly over two years. We had canceled 426,000 PSUs in the fourth quarter of 2022 related to the same internal performance milestones.
Schedule of Valuation Assumptions for Weighted-Average Grant | The following table summarizes shares, weighted-average exercise price, weighted-average remaining contractual term and aggregate intrinsic value of options outstanding and options exercisable as of March 31, 2023:
Options |  | Shares |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Outstanding as of March 31, 2023 |  |  | 943,000 |  |  | $ | 1.26 |  |  |  | 4.5 |  |  | $ | 1,425 |
Exercisable as of March 31, 2023 |  |  | 943,000 |  |  | $ | 1.26 |  |  |  | 4.5 |  |  | $ | 1,425 |
Share-based Compensation Expense by Line Item | The following table summarizes the amount of share-based compensation expense by line item on the statements of operations:
Share-based compensation expense |  | Three Months Ended |
|  | March 31, |
(in thousands) |  | 2023 |  |  | 2022 |
Research and development expense |  | $ | 757 |  |  | $ | 1,833 |
Sales, marketing, general and administrative expense |  |  | 2,192 |  |  |  | 1,901 |
|  | $ | 2,949 |  |  | $ | 3,734 |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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