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SUBSEQUENT EVENT (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2021
Oct. 28, 2021
Dec. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Subsequent Event [Line Items]          
Unrealized gain on investments       $ 40,072 $ 0
Stash          
Subsequent Event [Line Items]          
Unrealized gain on investments       $ 40,100  
Stash | Subsequent Event          
Subsequent Event [Line Items]          
Proceeds from sale of equity method investments   $ 35,300      
Stash | Subsequent Event | Forecast          
Subsequent Event [Line Items]          
Proceeds from sale of equity method investments $ 11,000   $ 46,300    
Realized gain on sale of equity method investment     27,900    
Unrealized gain on investments     $ 55,300