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STOCK-BASED COMPENSATION - Schedule of Share-based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Expense |  |  |  |
Share-based compensation | $ 876 | $ 1,163 | $ 1,732 | $ 2,056
Research and development expenses |  |  |  |
Expense |  |  |  |
Share-based compensation | 138 | 393 | 182 | 622
Selling, general and administrative |  |  |  |
Expense |  |  |  |
Share-based compensation | 738 | 770 | 1,550 | 1,786
Discontinued operations |  |  |  |
Expense |  |  |  |
Share-based compensation | $ 0 | $ 0 | $ 0 | $ (352)

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