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ORGANIZATION AND PRINCIPAL ACTIVITIES - Acquisition of KAG (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2019
shares
Dec. 31, 2020
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
shares
Business Acquisition [Line Items]        
Exchange ratio for restatement of equity 0.1562      
Par value of ordinary shares | $     $ 2  
Retrospective adjustment to addition paid-in capital for subscription receivable | $     $ 2  
Weighted average shares outstanding, basic and diluted (in shares) [1]   41,715,834 33,146,593 24,984,300
Common Stock reserved     4,200,000  
Before adjustment        
Business Acquisition [Line Items]        
Par value of ordinary shares | $     $ 16  
Subscription receivable | $     $ 16  
Weighted average shares outstanding, basic and diluted (in shares)       160,000,000
Reverse recapitalization | KAG        
Business Acquisition [Line Items]        
Percentage of issued and outstanding shares acquired 100.00%      
Number of ordinary shares acquired 160,000,000      
Number of shares issued in exchage of consideration 28,284,300      
Number of shares held in escrow 3,300,000      
[1] Share and per share data have been retroactively restated to give effect to the reverse recapitalization that is discussed in Note 1(a)