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SHARE BASED COMPENSATION (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 03, 2017
Sep. 09, 2015
Jan. 12, 2015
Dec. 21, 2018
Jun. 06, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted   12,569,166 6,274,166     0     8,134,375  
Weighted average fair value of stock options granted                 $ 0.59  
Share-based compensation           $ 13,788,049 $ 4,200,273 $ 2,702,089    
Unrecognized compensation cost related to non-vested stock options           $ 76,911        
Unrecognized compensation cost, recognition period           4 months 27 days        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price   $ 0.59 $ 0.87     $ 0.59        
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost Adjustment Description   The total incremental cost associated with the modification was $282,581, of which $123,322 was recognized immediately for the options vested prior to the date of the modification and the remaining share-based compensation charges of $159,259 are recognized over the remaining vesting period of the modified options. The total incremental cost associated with the modification was $241,557, of which $60,107 was recognized immediately for the options vested prior to the date of the modification and the remaining share-based compensation charges of $181,470 are recognized over the remaining vesting period of the modified options.              
Restricted Stock or Unit Expense           $ 13,103,276        
Share Incentive Plan 2014 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Ordinary shares authorized           21,000,000        
Share Incentive Plan 2018 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Ordinary shares authorized                   38,600,000
Share-based Compensation Award, Batch One [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Weighted average fair value of stock options granted   $ 0.38                
Share-based Compensation Award, Batch Two [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Weighted average fair value of stock options granted   0.35                
Share-based Compensation Award, Batch Three [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Weighted average fair value of stock options granted   0.38                
Share-based Compensation Award, Batch Four [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Weighted average fair value of stock options granted   0.37                
Share-based Compensation Award, Batch Five [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Weighted average fair value of stock options granted   $ 0.40                
Executive officers [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Weighted average fair value of stock options granted     $ 0.52              
Employees [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Weighted average fair value of stock options granted     $ 0.55              
Restricted Stock Units (RSUs) [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Unrecognized compensation cost, recognition period           3 years 9 months 25 days        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 1.48        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options           $ 60,140,629        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           44,365,641        
Restricted Stock Units (RSUs) [Member] | Share Incentive Plan 2014 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 12,653,992                  
Restricted Stock Units (RSUs) [Member] | Share Incentive Plan 2018 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         25,275,880          
Restricted Stock Units (RSUs) [Member] | Share Incentive Plan 2014 and 2018 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       8,105,000            
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member] | Share Incentive Plan 2018 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         10,984,761          
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award         where 1/6 of the RSUs will be vested on the grant date and the remaining will be vested 1/30 at each of the monthly anniversary for the grant date from July 6, 2018.          
Employee Stock Option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation           $ 684,773 $ 1,559,863 $ 2,702,089