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SHARE-BASED COMPENSATION - Plan (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 27, 2020
Aug. 02, 2019
Feb. 07, 2019
Mar. 31, 2020
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
Number of shares available for grant       9,800,000
Stock options        
SHARE-BASED COMPENSATION        
Contractual life       10 years
Senior management | Restricted shares        
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%  
Senior management | Stock options        
SHARE-BASED COMPENSATION        
Vesting percentage     12.50%  
Independent directors | Restricted shares        
SHARE-BASED COMPENSATION        
Restricted shares granted (in shares) 1,903   2,936