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EQUITY INVESTMENT (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jan. 06, 2021
Feb. 28, 2020
Schedule of Equity Method Investments [Line Items]        
Unrealized gain on investments $ 40,072,000 $ 0    
Stash        
Schedule of Equity Method Investments [Line Items]        
Equity investment, aggregate cost     $ 1,200,000 $ 80,000,000
Unrealized gain on investments 40,100,000      
Equity investment, cumulative impairment loss $ 0