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ORDINARY SHARES (Narrative) (Details) - $ / shares
1 Months Ended 12 Months Ended
Nov. 22, 2018
Dec. 31, 2017
Dec. 31, 2018
Jan. 01, 2017
ORDINARY SHARES [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 293,059      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price $ 0.4749      
Restricted stock [Member]        
ORDINARY SHARES [Line Items]        
Number of ordinary shares converted to Class A ordinary shares 293,059      
Awards vested 0 15,027    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 200,000      
Restricted stock [Member] | Employees [Member]        
ORDINARY SHARES [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%      
Class A Ordinary Shares [Member]        
ORDINARY SHARES [Line Items]        
Shares issued   34,206,939 38,756,289 33,990,680
Shares outstanding   34,206,939 38,756,289 33,990,680
Class C Ordinary Shares [Member]        
ORDINARY SHARES [Line Items]        
Shares issued   4,708,415 4,708,415 4,708,415
Shares outstanding   4,708,415 4,708,415 4,708,415