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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Investments, Revenue recognition and segment reporting (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Investments [Abstract]      
Impairment loss on available-for-sale security $ 51,000  
Impairment loss on available-for-sale security     $ 1,087
Impairment loss on equity security 6,845
Impairment loss on investment in equity investees 3,393 $ 68
Revenue recognition [Abstract]      
Deferred revenue recognized $ 2,296,486 $ 998,956  
Segment reporting [Abstract]      
Number of operating segments | Segment 3    
Number of reportable segments | Segment 3    
Minimum [Member]      
Investments [Abstract]      
Equity interest percentage 5.00%