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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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