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SHARE-BASED COMPENSATION - Restricted stock units (Details) - Restricted stock units
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Number of units  
Granted | shares 162
Vested | shares 20
Nonvested at the end | shares 142
Weighted average grant date fair value  
Granted (in dollars per share) | $ / shares $ 13.37
Vested (in dollars per share) | $ / shares 13.63
Nonvested at the end (in dollars per share) | $ / shares $ 13.34
Unrecognized compensation expense | $ $ 1,648
Unrecognized compensation expense, recognition period 4 years 11 months 19 days