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SHARE BASED COMPENSATION - Restricted stock units (Details) - Restricted stock units
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
shares
Number of units  
Nonvested at the beginning | shares 35,000
Granted | shares 500,000
Vested | shares (158,000)
Nonvested at the end | shares 377,000
Weighted average grant date fair value  
Nonvested at the beginning (in dollars per share) | $ / shares $ 14.01
Granted (in dollars per share) | $ / shares 11.67
Vested (in dollars per share) | $ / shares 24.33
Nonvested at the end (in dollars per share) | $ / shares $ 6.57
Unrecognized compensation expense | $ $ 2,238
Unrecognized compensation expense, recognition period 2 years 3 months 18 days