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STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 7,347 | $ 2,017 | $ 1,698
Unrecognized compensation cost | 8,714 |  |
ESPP |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | 43 | 47 | 34
Stock options |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | 3,057 | 490 | 242
Unrecognized compensation cost | $ 3,550 |  |
Weighted-Average Amortization Period (Years) | 2 years 10 months 24 days |  |
RSUs |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 4,053 | 1,280 | 1,149
Unrecognized compensation cost | $ 4,776 |  |
Weighted-Average Amortization Period (Years) | 2 years 2 months 12 days |  |
RSAs |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 194 | 200 | 273
Unrecognized compensation cost | $ 388 |  |
Weighted-Average Amortization Period (Years) | 2 years 7 months 6 days |  |
Selling, general and administrative |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 5,305 | 2,017 | 1,698
Research and development |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 2,042 | $ 0 | $ 0

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