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SHARE OPTIONS (Summary of Range of Prices of Stock Options) (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Share
$ / shares
shares
Dec. 31, 2020
USD ($)
Share
$ / shares
shares
Dec. 31, 2019
Share
$ / shares
Dec. 31, 2018
Share
Outstanding        
Weighted average contractual life remaining (years) 4 years 4 months 6 days 5 years 3 months 25 days    
Class A Ordinary shares [Member]        
Outstanding        
Number of Options | Share 18,727,990 19,485,990 12,303,990 10,908,200
Exercisable        
Number of Options | shares 13,401,322 7,959,324    
Weighted average exercise price | $ / shares $ 0 $ 0 $ 0  
Class A Ordinary shares [Member] | US$0.19-US$0.99 [Member]        
Outstanding        
Number of Options | Share 13,000,006 13,260,006    
Weighted average exercise price | $ $ 0.48 $ 0.48    
Weighted average contractual life remaining (years)   4 years 1 month 20 days    
Exercisable        
Number of Options | shares 7,960,004 2,106,673    
Weighted average exercise price | $ / shares $ 0.55 $ 0.69    
Weighted average contractual life remaining (years) 2 years 11 months 1 day 1 year 5 months 8 days    
Class A Ordinary shares [Member] | US$1.00-US$2.05 [Member]        
Outstanding        
Number of Options | Share 5,228,000 5,664,000    
Weighted average exercise price | $ $ 1.34 $ 1.34    
Weighted average contractual life remaining (years) 9 months 14 days 1 year 1 month 9 days    
Exercisable        
Number of Options | shares 4,941,334 5,290,667    
Weighted average exercise price | $ / shares $ 1.35 $ 1.35    
Weighted average contractual life remaining (years) 11 months 26 days 2 years 5 months 8 days    
Class A Ordinary shares [Member] | US$2.06- US$2.99 [Member]        
Outstanding        
Number of Options | Share 439,984 499,984    
Weighted average exercise price | $ $ 2.53 $ 2.52    
Weighted average contractual life remaining (years) 10 days 18 days    
Exercisable        
Number of Options | shares 439,984 499,984    
Weighted average exercise price | $ / shares $ 2.53 $ 2.52    
Weighted average contractual life remaining (years) 14 days 1 month 17 days    
Class A Ordinary shares [Member] | US$3.00 -US$4.36 [Member]        
Outstanding        
Number of Options | Share 60,000 62,000    
Weighted average exercise price | $ $ 4.17 $ 4.17    
Weighted average contractual life remaining (years) 0 years 0 years    
Exercisable        
Number of Options | shares 60,000 62,000    
Weighted average exercise price | $ / shares $ 4.17 $ 4.17    
Weighted average contractual life remaining (years) 0 years 3 days    
Class A Ordinary shares [Member] | US$0.19-US$0.99 [Member]        
Outstanding        
Weighted average contractual life remaining (years) 3 years 6 months 14 days      
American depositary share [Member]        
Outstanding        
Number of Options | Share 4,681,998 4,871,498 3,075,998 2,727,050
Exercisable        
Number of Options | shares 3,350,331 1,989,831    
Weighted average exercise price | $ / shares $ 0 $ 0 $ 0  
American depositary share [Member] | US$0.77-US$3.96 [Member]        
Outstanding        
Number of Options | Share 3,250,002 3,315,002    
Weighted average exercise price | $ $ 1.94 $ 1.92    
Weighted average contractual life remaining (years) 3 years 6 months 14 days 4 years 2 months 1 day    
Exercisable        
Number of Options | shares 1,990,001 526,668    
Weighted average exercise price | $ / shares $ 2.19 $ 2.76    
Weighted average contractual life remaining (years) 2 years 11 months 1 day 1 year 5 months 8 days    
American depositary share [Member] | US$4.00-US$8.20 [Member]        
Outstanding        
Number of Options | Share 1,307,000 1,416,000    
Weighted average exercise price | $ $ 5.36 $ 5.36    
Weighted average contractual life remaining (years) 9 months 14 days 1 year 1 month 6 days    
Exercisable        
Number of Options | shares 1,235,334 1,322,667    
Weighted average exercise price | $ / shares $ 5.40 $ 5.40    
Weighted average contractual life remaining (years) 11 months 26 days 2 years 5 months 8 days    
American depositary share [Member] | US$8.24- US$11.96 [Member]        
Outstanding        
Number of Options | Share 109,996 124,996    
Weighted average exercise price | $ $ 10.13 $ 10.08    
Weighted average contractual life remaining (years) 10 days 18 days    
Exercisable        
Number of Options | shares 109,996 124,996    
Weighted average exercise price | $ / shares $ 10.13 $ 10.08    
Weighted average contractual life remaining (years) 14 days 1 month 17 days    
American depositary share [Member] | US$12.00 -US$17.45 [Member]        
Outstanding        
Number of Options | Share 15,000 15,500    
Weighted average exercise price | $ $ 16.67 $ 16.68    
Weighted average contractual life remaining (years) 0 years 0 years    
Exercisable        
Number of Options | shares 15,000 15,500    
Weighted average exercise price | $ / shares $ 16.67 $ 16.68    
Weighted average contractual life remaining (years) 0 years 3 days