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SHARE-BASED COMPENSATION - Restricted stock units (Details) - Restricted stock units
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2023
USD ($)
$ / shares
shares
Number of units  
Nonvested at the beginning | shares 42,000
Vested | shares (16,000)
Nonvested at the end | shares 26,000
Weighted average grant date fair value  
Nonvested at the beginning (in dollars per share) | $ / shares $ 14.61
Vested (in dollars per share) | $ / shares 14.73
Nonvested at the end (in dollars per share) | $ / shares $ 14.54
Unrecognized compensation expense | $ $ 309
Unrecognized compensation expense, recognition period 1 year 3 months 29 days