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SHARE BASED COMPENSATION - Restricted Share Units ("RSUs") (Details) - USD ($)
12 Months Ended
Apr. 30, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Total share based compensation   $ 13,370,377 $ 6,054,612 $ 4,062,600
Service-based RSUs        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Beginning balance   69,826,580 28,406,980  
Granted   21,259,735 44,179,590  
Cancelled to grant new RSUs 900,000   (900,000)  
Exercised   (22,237,430) (449,990)  
Forfeited   (3,032,440) (1,410,000)  
Ending balance   65,816,445 69,826,580 28,406,980
Beginning balance   $ 0.28 $ 0.34  
Granted   0.97 0.23  
Cancelled to grant new RSUs     0.26  
Exercised   0.34 0.23  
Forfeited   0.34 0.20  
Ending balance   $ 0.48 $ 0.28 $ 0.34
Weighted average period expected to be recognized for unrecognized share based compensation expense   2 years 3 months 18 days    
Total share based compensation   $ 9,097,438 $ 4,353,480 $ 1,823,464
Total unrecognized share based compensation expense   $ 22,309,037    
Share options        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted 8,560,000      
Number of options cancelled during the period 7,660,000   7,660,000  
Weighted average period expected to be recognized for unrecognized share based compensation expense   3 years 7 months 6 days    
Total share based compensation $ 800,000 $ 4,272,939 $ 1,701,132 $ 2,239,136
Total unrecognized share based compensation expense $ 1,700,000      
Restricted Share Units ("RSUs") | Minimum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted average period expected to be recognized for unrecognized share based compensation expense 3 years      
Restricted Share Units ("RSUs") | Maximum        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted average period expected to be recognized for unrecognized share based compensation expense 3 years 6 months