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Stock Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Stock Based Compensation Expenses | Stock-based compensation is recorded in the consolidated statements of operations as fol lows (in thousands):
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Cost of goods sold |  | $ | 29 |  |  | $ | 36 |  |  | $ | 73 |  |  | $ | 71 |
Research and development |  |  | 230 |  |  |  | 255 |  |  |  | 747 |  |  |  | 800 |
Sales and marketing(1) |  |  | (223 | ) |  |  | 273 |  |  |  | 53 |  |  |  | 856 |
General and administrative |  |  | 487 |  |  |  | 556 |  |  |  | 1,599 |  |  |  | 1,848 |
Total stock-based compensation expense |  | $ | 523 |  |  | $ | 1,120 |  |  | $ | 2,472 |  |  | $ | 3,575 |
(1) In the quarter ending September 30, 2023, the company recorded $0.2 million stock based compensation expense reversals that were non-vested and previously recognized expense in the sales and marketing department due to terminations.
Summary of Outstanding Stock Option Activity | The following table summarizes the outstanding stock option activity during the period indi cated (shares in thousands):
|  |  |  |  | Weighted average |  |  |
|  | Number of stock options |  |  | Exercise price |  |  | Remaining contractual term (in years) |  | Aggregate Intrinsic Value (in thousands) |
Balance at December 31, 2022 |  |  | 2,065 |  |  | $ | 11.78 |  |  |  | 6.7 |  | $ | 758.00 |
Granted |  |  | 297 |  |  | $ | 5.56 |  |  |  |  |  |
Exercised |  |  | (12 | ) |  | $ | 2.30 |  |  |  |  | $ | 40.00 |
Expired/Forfeited |  |  | (304 | ) |  | $ | 13.65 |  |  |  |  |  |
Balance at September 30, 2023 |  |  | 2,046 |  |  | $ | 10.65 |  |  |  | 6.2 |  | $ | 281.00 |
Vested and exercisable at September 30, 2023 |  |  | 1,461 |  |  | $ | 11.36 |  |  |  | 5.2 |  | $ | 281.00 |
Vested and expected to vest at September 30, 2023 |  |  | 2,046 |  |  | $ | 10.65 |  |  |  | 6.2 |  | $ | 281.00 |
Summary of Outstanding Restricted Stock Unit Activity | The following table summarizes the Company's restricted stock unit (RSU) activity during the period indi cated (shares in thousands):
|  | Restricted stock units |  |  | Weighted average grant date fair value |
Balance at December 31, 2022 |  |  | 444 |  |  | $ | 11.78 |
Grants |  |  | 653 |  |  | $ | 5.16 |
Vested and released |  |  | (287 | ) |  | $ | 8.17 |
Forfeited |  |  | (138 | ) |  | $ | 9.28 |
Balance at September 30, 2023 |  |  | 672 |  |  | $ | 7.41 |
Schedule of Performance Stock Unit | The following table summarizes the Company's performance stock unit (PSU) activity during the period indi cated (shares in thousands):
|  | Performance stock units |  |  | Weighted average grant date fair value |
Balance at December 31, 2022 |  |  | 137 |  |  | $ | 2.09 |
Grants |  |  | — |  |  | $ | — |
Vested and released |  |  | — |  |  | $ | — |
Forfeited |  |  | (45 | ) |  | $ | 2.20 |
Balance at September 30, 2023 |  |  | 92 |  |  | $ | 2.03 |

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