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SHARE BASED COMPENSATION (Summary of Stock Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 09, 2015
Jan. 12, 2015
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2015
Number of Options            
Options outstanding     6,765,117      
Granted 12,569,166 6,274,166 0 0 0 8,134,375
Exercised     (4,916,850)      
Options outstanding     1,848,267 6,765,117    
Options vested or expected to vest     20,207,103      
Options exercisable     1,847,659      
Weighted Average Exercise Price            
Options outstanding     $ 0.56      
Granted     0      
Exercised $ 0.59 $ 0.87 0.54      
Options outstanding     0.59 $ 0.56    
Options vested or expected to vest     0.47      
Options exercisable     $ 0.59      
Weighted Average Remaining Contract Life            
Options outstanding     3 years 8 months 26 days      
Options vested or expected to vest     2 years 4 months 24 days      
Options exercisable     3 years 8 months 26 days      
Aggregate Intrinsic Value            
Options outstanding     $ 20,104      
Options vested or expected to vest     222,373      
Options exercisable     $ 20,097