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SHARE-BASED COMPENSATION - Summary of Stock options activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 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, nonvested 35,000    
Awards granted 55,000    
Exercised (7,000)    
Outstanding, nonvested 83,000 35,000  
Weighted Average Exercise Price      
Outstanding at the beginning (in dollars per share) $ 14.44    
Granted (in dollars per share) 18.02    
Exercised (in dollars per share) 14.44    
Outstanding at the end (in dollars per share) 16.83 $ 14.44  
Weighted Average Fair Value      
Outstanding at the beginning (in dollars per share) 8.67    
Granted (in dollars per share) 14.07    
Exercised (in dollars per share) 8.67    
Outstanding at the end (in dollars per share) $ 12.27 $ 8.67  
Weighted Average Remaining Contractual Life and Intrinsic Value      
Granted (in years) 9 years 11 months 23 days    
Outstanding (in years) 9 years 7 months 9 days 8 years 10 months 9 days  
Outstanding at the end (in dollars) $ 98    
Non-vested shares 83,000 35,000  
Unrecognized compensation expense $ 1,011    
Unrecognized compensation expense, recognition period 9 years 11 months 23 days