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STOCKHOLDERS’ EQUITY (Tables) | 9 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Schedule of Stock-Based Compensation Included in Operating Expenses | All stock-based compensation is included in operating expenses as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Compensation cost recognized: |  |  |  |  |  |  |
Selling, general & administrative | $ | 301 |  |  | $ | 561 |  |  | $ | 1,125 |  |  | $ | 1,270 |
Research & development | 41 |  |  | 168 |  |  | 222 |  |  | 498 |
| $ | 342 |  |  | $ | 729 |  |  | $ | 1,347 |  |  | $ | 1,768 |
Schedule of Stock Option Activity | Stock option activity under the 2015 Plan during the period indicated below is as follows:
| Number of Shares Subject to Issuance |  | Weighted- average Exercise Price |  | Weighted- average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at December 31, 2022 | 1,120,244 |  | $ | 3.68 |  |  | 3.50 years |  | $ | 84 |
Granted | 627,507 |  | 2.91 |  |  | – |  |  | – |
Forfeited, cancelled, or expired | (516,846) |  | 3.89 |  |  | – |  |  | – |
Outstanding at September 30, 2023 | 1,230,905 |  | $ | 2.33 |  |  | 3.08 years |  | $ | 135 |
Exercisable at September 30, 2023 | 593,494 |  | $ | 3.69 |  |  | 2.10 years |  | $ | 73 |
Schedule of Restricted Stock Unit (RSU) Activity | Restricted stock unit activity during the period indicated below is as follows:
| Number of Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2022 | 214,892 |  | $ | 8.43 |
Granted | 207,306 |  | 2.43 |
Forfeited or surrendered | (70,959) |  | 10.04 |
Vested and settled in shares | (278,057) |  | 4.42 |
Outstanding at September 30, 2023 | 73,182 |  | $ | 5.11 |
Schedule of Performance Stock Unit (PSU) Activity |
| Number of Shares |  | Weighted Average Grant Date Fair Value
Outstanding at December 31, 2022 | 177,688 |  | $ | 7.91 |
Forfeited | (88,844) |  | 7.91 |
Vested and settled in shares | (88,844) |  | 7.91 |
Outstanding at September 30, 2023 | — |  | $ | 7.91 |

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