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SHARE-BASED COMPENSATION - RSUs to Employees (Details) - RSUs - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SHARE-BASED COMPENSATION      
Shares granted to employees 2,161,098 1,105,640 706,637
Weighted average grant date fair value $ 26.10    
Number of unvested awards outstanding 3,335,303 1,888,753  
Total compensation cost at the date of grant $ 55,822 $ 24,918 $ 12,179
Total recognized compensation cost 8,808 $ 12,350 $ 10,682
Total unrecognized share-based compensation costs $ 22,002    
Weighted-average period of recognition of compensation expense 2 years 4 months 6 days    
Number of Shares      
Unvested at the beginning of the period (in shares) 1,888,753    
Granted (in shares) 2,161,098 1,105,640 706,637
Vested (in shares) (562,376)    
Forfeited (in shares) (152,172)    
Unvested at the end of the period (in shares) 3,335,303 1,888,753  
Weighted Average Grant-Date Fair Value      
Unvested at the beginning of the period (in dollars per share) $ 19.78    
Granted (in dollars per share) 26.10    
Vested (in dollars per share) 17.11    
Forfeited (in dollars per share) 22.04    
Unvested at the end of the period (in dollars per share) $ 24.23 $ 19.78  
Total fair value of shares vested $ 21,628 $ 14,420 $ 10,733
Employees      
SHARE-BASED COMPENSATION      
Shares granted to employees   2,096,000  
Vesting percentage   50.00%  
Weighted average grant date fair value   $ 25.69  
Number of unvested awards outstanding 2,076,000    
Number of Shares      
Granted (in shares)   2,096,000  
Unvested at the end of the period (in shares) 2,076,000    
Weighted Average Grant-Date Fair Value      
Granted (in dollars per share)   $ 25.69  
Tranche one | Employees      
SHARE-BASED COMPENSATION      
Vesting percentage   25.00%  
Tranche two | Employees      
SHARE-BASED COMPENSATION      
Vesting percentage   25.00%  
Minimum      
SHARE-BASED COMPENSATION      
Grant period (in years) 1 year    
Maximum      
SHARE-BASED COMPENSATION      
Grant period (in years) 4 years