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SHARE BASED COMPENSATION - Restricted Share Units ("RSUs") (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted-Average Grant-Date Fair Value      
Total share based compensation $ 4,062,600 $ 34,204,761 $ 349,700
Service-based RSUs      
Number of Units      
Beginning balance 10,800,000    
Granted 18,319,012    
Exercised (2,162,032)    
Ending balance 26,956,980 10,800,000  
Weighted-Average Grant-Date Fair Value      
Beginning balance $ 0.33    
Granted 0.35    
Exercised 0.47    
Ending balance $ 0.36 $ 0.33  
Total share based compensation $ 1,685,646 $ 324,565 4,497
Total unrecognized share based compensation expense $ 7,803,087    
Weighted average period expected to be recognized for unrecognized share based compensation expense 3 years 3 months 18 days    
Performance-based RSUs      
Number of Units      
Granted 1,700,000    
Exercised (250,000)    
Ending balance 1,450,000    
Weighted-Average Grant-Date Fair Value      
Granted $ 0.40    
Exercised 0.48    
Ending balance $ 0.38    
Total share based compensation $ 137,818 $ 0 $ 0
Total unrecognized share based compensation expense $ 511,464    
Weighted average period expected to be recognized for unrecognized share based compensation expense 3 years 8 months 12 days