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SHAREHOLDERS' EQUITY - Summary of Restricted Shares Outstanding in Equity Incentive Plans (Details) - Restricted stock grants - shares
1 Months Ended 12 Months Ended
Jan. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Changes in number of shares outstanding      
Outstanding at beginning of the year 725,296 725,296 705,847
Issued 158,299   156,399
Cancelled   0 0
Vested   (139,450) (136,950)
Outstanding at the end of the year   744,145 725,296