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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 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     12.00%   75.00%
Customer Concentration Risk | Accounts Receivable | Customer 2 | Related Party          
Concentration Risk [Line Items]          
Concentration risk percentage     13.00%   16.00%
Customer Concentration Risk | Revenue Benchmark | Customer 1 | Related Party | Portfolio servicing          
Concentration Risk [Line Items]          
Concentration risk percentage 20.00%   25.00%    
Customer Concentration Risk | Revenue Benchmark | Customer 1 | Nonrelated Party          
Concentration Risk [Line Items]          
Concentration risk percentage   26.00%   71.00%  
Customer Concentration Risk | Revenue Benchmark | Customer 1 | Nonrelated Party | Active management          
Concentration Risk [Line Items]          
Concentration risk percentage 27.00%   29.00%    
Customer Concentration Risk | Revenue Benchmark | Customer 2 | Related Party | Portfolio servicing          
Concentration Risk [Line Items]          
Concentration risk percentage 20.00%   27.00%    
Customer Concentration Risk | Investment Method Revenue Benchmark | Customer 1 | Nonrelated Party          
Concentration Risk [Line Items]          
Concentration risk percentage     16.00%