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STOCK-BASED COMPENSATION - Restricted Stock Units (Details) - Restricted stock units - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total compensation cost not yet recognized $ 116  
Weighted average service period 1 year 8 months 12 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Non-vested restricted stock (units), number of shares of restricted stock (unit), At the Beginning of the Year (shares) 63,436 57,773
Granted, Number of share of restricted stock (shares) 10,310 78,978
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Shares Earned Above Target 0 723
Vested, number of share of restricted stock (shares) (33,188) (55,451)
Forfeited, number of share of restricted stock (shares) (22,384) (15,090)
Non-vested restricted stock (units), number of shares of restricted stock (unit), At the End of the Period (shares) 18,174 66,933
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Non-vested restricted stock (units), weighted average grant date fair value, At the Beginning of the Year (usd per share) $ 15.12 $ 15.68
Granted, weighted average grant date fair value (usd per share) 9.01 15.24
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Earned Above Target, Weighted Average Grant Date Fair Value 0.00 17.00
Vested, weighted average grant date fair value (usd per share) 12.83 15.19
Forfeited, weighted average grant date fair value (usd per share) 15.20 15.38
Non-vested restricted stock (units), weighted average grant date fair value, At the End of the Period (usd per share) $ 15.75 $ 15.22
Non-Employee Director    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted, Number of share of restricted stock (shares) 10,310