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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Summary of allocated expense | The following table summarizes ESPP expense incurred under the 2016 Employee Stock Purchase Plan and included in our accompanying unaudited interim condensed consolidated statements of operations:
(in thousands) | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Selling, general, and administrative | $ | 137 |  |  | $ | 70 |  |  | $ | 276 |  |  | $ | 143 |
Cost of sales | 30 |  |  | 18 |  |  | 60 |  |  | 30 |
Research and development | 12 |  |  | 12 |  |  | 23 |  |  | 19 |
Total | $ | 179 |  |  | $ | 100 |  |  | $ | 359 |  |  | $ | 192 |
The following table summarizes stock-based compensation expense incurred under the Amended 2022 Stock Plan and Inducement Grants included in the accompanying unaudited interim condensed consolidated statements of operations:
(in thousands) | Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Selling, general, and administrative | $ | 7,069 |  |  | $ | 4,766 |  |  | $ | 13,301 |  |  | $ | 8,673 |
Research and development | 334 |  |  | 213 |  |  | 606 |  |  | 413 |
Cost of sales | 282 |  |  | 170 |  |  | 532 |  |  | 309 |
Total | $ | 7,685 |  |  | $ | 5,149 |  |  | $ | 14,439 |  |  | $ | 9,395 |
Summary of stock option and restricted stock activity | A summary of stock options (including Inducement Grants), RSA, and PSU activity under the Amended 2022 Stock Plan and Inducement Grants during the six months ended June 30, 2024 and 2023 is presented below:
(in thousands) | Options |  | PSUs |  | RSAs |
Outstanding at December 31, 2022 | 907 |  | — |  | 1,141 |
Granted | 3 |  | 85 |  | 624 |
Options Exercised/RSAs Vested | (26) |  | — |  | (338) | (1)
Forfeited | (24) |  | — |  | (46) |
Outstanding at June 30, 2023 | 860 |  | 85 |  | 1,381 |
Outstanding at December 31, 2023 | 689 |  | 84 |  | 1,351 |
Granted | — |  | 74 |  | 606 |
Options Exercised/RSAs Vested | (54) |  | — |  | (433) | (2)
Forfeited | — |  | — |  | (12) |
Outstanding at June 30, 2024 | 635 |  | 158 |  | 1,512 |
______________________________________________ (1)Includes 99 thousand shares purchased from employees to cover employee income taxes related to income earned upon vesting of restricted stock. The shares purchased are held in treasury and the $4.1 million total purchase price for the shares is included in Treasury stock in our accompanying unaudited interim condensed consolidated balance sheets. (2)Includes 149 thousand shares purchased from employees to cover employee income taxes related to income earned upon vesting of restricted stock. The shares purchased are held in treasury and the $10.0 million total purchase price for the shares is included in Treasury stock in our accompanying unaudited inte rim condensed consolidated balance sheets.

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