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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% |  |

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