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SHARE-BASED COMPENSATION - Restricted stock units (Details) - Restricted stock units
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Number of units  
Nonvested at the beginning | shares 142,000
Granted | shares 2,000
Vested | shares 19,000
Canceled | shares (82,000)
Nonvested at the end | shares 43,000
Weighted average grant date fair value  
Nonvested at the beginning (in dollars per share) | $ / shares $ 13.34
Granted (in dollars per share) | $ / shares 9.59
Vested (in dollars per share) | $ / shares 13.23
Canceled (in dollars per share) | $ / shares 13.12
Nonvested at the end (in dollars per share) | $ / shares $ 13.46
Unrecognized compensation expense | $ $ 479
Unrecognized compensation expense, recognition period 4 years 1 month 10 days