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SHARE-BASED COMPENSATION - Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 02, 2020
Aug. 10, 2020
Mar. 27, 2020
Aug. 02, 2019
Feb. 07, 2019
Jun. 30, 2020
Jun. 30, 2021
SHARE-BASED COMPENSATION              
Number of shares may be issued to employees, directors, consultants and nonemployee service providers in the form of stock options, stock and stock appreciation rights             10,000,000.0
Number of shares available for grant             9,700,000
Stock options              
SHARE-BASED COMPENSATION              
Contractual life             10 years
Stock options | Senior management              
SHARE-BASED COMPENSATION              
Contractual life   10 years     10 years    
Vesting percentage   20.00%     12.50%    
Restricted shares | Senior management              
SHARE-BASED COMPENSATION              
Restricted shares granted (in shares)       39,526 120,000    
Grant date fair value       $ 496 $ 1,636    
Vesting percentage       20.00% 14.30%    
Restricted shares forfeited (in shares)           42,857  
Restricted shares | Independent directors              
SHARE-BASED COMPENSATION              
Restricted shares granted (in shares) 2,022   1,903   2,936    
Grant date fair value $ 30   $ 18   $ 40