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STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023
Stock-Based Compensation |  |  |
Stock based compensation expense | $ 420 | $ 179 |
Remaining unrecognized compensation expense related to nonvested awards | 3,400 |  | $ 3,400
Weighted-average remaining requisite service period |  |  | 1 year 2 months 12 days
Cost of sales |  |  |
Stock-Based Compensation |  |  |
Stock based compensation expense | 5 | 4 |
Selling, general and administrative |  |  |
Stock-Based Compensation |  |  |
Stock based compensation expense | 339 | 224 |
Research and development |  |  |
Stock-Based Compensation |  |  |
Stock based compensation expense | $ 76 | $ (49) |

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