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ORGANIZATION AND PRINCIPAL ACTIVITIES, Reverse, Recapitalization (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Dec. 29, 2021
shares
Reverse Recapitalization [Abstract]        
Shares issued (in shares) 174,853,546      
Ordinary shares issued (in shares) 261,256,254 174,853,546    
Ordinary shares outstanding (in shares) 261,256,254 174,853,546    
Cash - NBG | $ $ 247,382,859 $ 0 $ 0  
Less: transaction costs | $ (883,300)      
Net cash contributions from reverse recapitalization | $ $ 246,499,559      
Amended 2016 Plan [Member]        
Reverse Recapitalization [Abstract]        
Ordinary shares, option to purchase (in shares) 9,225,271      
Exchange ratio 0.71536      
CAC [Member]        
Reverse Recapitalization [Abstract]        
Common stock, par value (in dollars per share) | $ / shares $ 0.001      
CEG [Member]        
Reverse Recapitalization [Abstract]        
Common stock, par value (in dollars per share) | $ / shares $ 0.01      
NBG [Member]        
Reverse Recapitalization [Abstract]        
Ordinary shares issued (in shares) 86,402,708     86,402,708
Ordinary shares outstanding (in shares) 86,402,708     86,402,708