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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Concentration Risk [Line Items]        
Allowance for doubtful accounts $ 0 $ 0   $ 0
Customer Concentration Risk | Accounts Receivable | Customer 1 | Related Party        
Concentration Risk [Line Items]        
Concentration risk percentage   5.00%   75.00%
Customer Concentration Risk | Accounts Receivable | Customer 2 | Related Party        
Concentration Risk [Line Items]        
Concentration risk percentage   5.00%   16.00%
Customer Concentration Risk | Revenue Benchmark | Customer 1 | Related Party | Portfolio servicing        
Concentration Risk [Line Items]        
Concentration risk percentage 39.00% 36.00%    
Customer Concentration Risk | Revenue Benchmark | Customer 1 | Nonrelated Party        
Concentration Risk [Line Items]        
Concentration risk percentage     44.00%  
Customer Concentration Risk | Revenue Benchmark | Customer 1 | Nonrelated Party | Active management        
Concentration Risk [Line Items]        
Concentration risk percentage 13.00% 22.00%    
Customer Concentration Risk | Revenue Benchmark | Customer 2 | Related Party | Portfolio servicing        
Concentration Risk [Line Items]        
Concentration risk percentage 39.00% 37.00%    
Customer Concentration Risk | Revenue Benchmark | Customer 2 | Nonrelated Party        
Concentration Risk [Line Items]        
Concentration risk percentage     29.00%  
Customer Concentration Risk | Investment Method Revenue Benchmark | Customer 1 | Nonrelated Party        
Concentration Risk [Line Items]        
Concentration risk percentage   9.00%