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SHARE-BASED COMPENSATION - Restricted stock units (Details) - Restricted stock units
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Number of units  
Nonvested at the beginning | shares 45,000
Vested | shares (9,000)
Nonvested at the end | shares 36,000
Weighted average grant date fair value  
Nonvested at the beginning (in dollars per share) | $ / shares $ 13.68
Vested (in dollars per share) | $ / shares 13.63
Nonvested at the end (in dollars per share) | $ / shares $ 13.70
Unrecognized compensation expense | $ $ 392
Unrecognized compensation expense, recognition period 3 years 4 months 9 days