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LONG-TERM INVESTMENT (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 21, 2019
Mar. 31, 2017
Feb. 06, 2015
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
LONG-TERM INVESTMENT            
Share of income (loss) from equity method investment       $ 2,118 $ 221 $ 208
Percentage Of Equity Interest Transferred 30.00%          
Demon            
LONG-TERM INVESTMENT            
Percentage of equity interest     30.00%      
Total consideration     $ 2,100      
Share of income (loss) from equity method investment       $ 2,118 $ 221 $ 208
Maikailai            
LONG-TERM INVESTMENT            
Percentage of equity interest   10.53%        
Total consideration   $ 2,950