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STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 2,017 | $ 1,698 | $ 2,056
Unrecognized compensation cost | 2,408 |  |
ESPP |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | 47 | 34 | 10
Stock options |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | 490 | 242 | 0
Unrecognized compensation cost | $ 1,507 |  |
Weighted-Average Amortization Period (Years) | 2 years 9 months 18 days |  |
RSUs |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 1,280 | 1,149 | 1,431
Unrecognized compensation cost | $ 574 |  |
Weighted-Average Amortization Period (Years) | 6 months |  |
RSAs |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 200 | 273 | 615
Unrecognized compensation cost | $ 327 |  |
Weighted-Average Amortization Period (Years) | 2 years 7 months 6 days |  |
General and administrative |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 2,017 | $ 1,698 | $ 2,056

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