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SHARE BASED COMPENSATION - Restricted Share Units ("RSUs") (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 30, 2020
Apr. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted-Average Grant-Date Fair Value          
Total share based compensation     $ 6,054,612 $ 4,062,600 $ 34,204,761
Restricted Share Units ("RSUs")          
Weighted-Average Grant-Date Fair Value          
Number of options cancelled during the period   900,000      
Restricted Share Units ("RSUs") | Minimum          
Weighted-Average Grant-Date Fair Value          
Weighted average period expected to be recognized for unrecognized share based compensation expense   3 years      
Restricted Share Units ("RSUs") | Maximum          
Weighted-Average Grant-Date Fair Value          
Weighted average period expected to be recognized for unrecognized share based compensation expense   3 years 6 months      
Service-based RSUs          
Number of Units          
Beginning balance     28,406,980 10,800,000  
Granted     44,179,590 20,019,012  
Cancelled to grant new RSUs     (900,000)    
Exercised     (449,990) (2,412,032)  
Forfeited     (1,410,000)    
Ending balance     69,826,580 28,406,980 10,800,000
Weighted-Average Grant-Date Fair Value          
Beginning balance     $ 0.34 $ 0.33  
Granted     0.23 0.36  
Cancelled to grant new RSUs     0.26    
Exercised     0.23 0.47  
Forfeited     0.20    
Ending balance     $ 0.28 $ 0.34 $ 0.33
Total share based compensation     $ 4,353,480 $ 1,823,464 $ 324,565
Total unrecognized share based compensation expense     $ 14,296,333    
Weighted average period expected to be recognized for unrecognized share based compensation expense     2 years 10 months 24 days    
Share options          
Number of Units          
Granted 8,560,000        
Weighted-Average Grant-Date Fair Value          
Total share based compensation $ 800,000   $ 1,701,132 $ 2,239,136 $ 1,522,271
Total unrecognized share based compensation expense $ 1,700,000 $ 1,700,000      
Weighted average period expected to be recognized for unrecognized share based compensation expense     3 years 6 months    
Number of options cancelled during the period 7,660,000   7,660,000