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SHARE-BASED COMPENSATION - Summary of Stock options activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
2018 Incentive Compensation Plan |  |  |
Weighted Average Remaining Contractual Life and Intrinsic Value |  |  |
Common stock available for issuance |  |  | 2,300,000
Stock options |  |  |
Number of units |  |  |
Outstanding at the beginning | 35,000 |  |
Outstanding at the end | 35,000 | 35,000 |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning (in dollars per share) | $ 14.44 |  |
Outstanding at the end (in dollars per share) | 14.44 | $ 14.44 |
Weighted Average Fair Value |  |  |
Outstanding at the beginning (in dollars per share) | 8.67 |  |
Outstanding at the end (in dollars per share) | $ 8.67 | $ 8.67 |
Weighted Average Remaining Contractual Life and Intrinsic Value |  |  |
Outstanding (in years) | 9 years 4 months 9 days | 9 years 7 months 9 days |
Outstanding at the end (in dollars) | $ 114 |  |
Non-vested shares | 35,000 |  |
Unrecognized compensation expense | $ 262 |  |
Unrecognized compensation expense, recognition period | 4 years 4 months 9 days |  |

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