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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (a) Through (r) (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Aug. 21, 2023 USD ($) | Sep. 23, 2022 USD ($) | Jun. 30, 2018 | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) loanReceivable shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jan. 22, 2024 USD ($) | Dec. 18, 2023 USD ($) | Nov. 16, 2023 USD ($) | Jan. 12, 2023 USD ($) | Sep. 09, 2022 USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive fee payable |  |  |  |  | $ 16,633,000 | $ 4,297,000 |  |  |  |  |  |  |  |
Loans receivable, at fair value (includes $387,657 and $98,729 from related parties as of December 31, 2023 and 2022, respectively) |  |  |  |  | $ 532,419,000 | 701,652,000 |  |  |  |  |  |  |  |
Number of existing loan receivable | loanReceivable |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Loans receivable at fair value |  |  |  |  | $ 532,419,000 | 701,652,000 |  |  |  |  |  |  |  |
Loans receivable, fair value disclosure, maximum loss exposure |  |  |  |  | 368,074,000 |  |  |  |  |  |  |  |  |
Advertising costs |  |  |  |  | 11,097,000 | 11,434,000 | $ 3,681,000 |  |  |  |  |  |  |
Recognized compensation expense |  |  |  |  |  | $ 369,000 | 758,000 |  |  |  |  |  |  |
Number of shares reserved for future issuance (in shares) | shares |  |  |  |  |  | 362,986 |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  | 1,875,000 | $ 2,308,000 |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  | 9,468,000 | 5,677,000 | 3,865,000 |  |  |  |  |  |  |
Net of unamortized costs, origination fees, premiums and discounts |  |  |  |  | 7,755,000 | 3,851,000 |  |  |  |  |  |  |  |
Fair value, option, aggregate differences, loans and long-term receivables |  |  |  |  | 23,463,000 | 67,370,000 |  |  |  |  |  |  |  |
Financing receivable, unrealized gain (loss) |  |  |  |  | 55,756,000 | (54,439,000) | 10,035,000 |  |  |  |  |  |  |
Financing receivable, nonaccrual |  |  |  |  | $ 41,236,000 | $ 7,153,000 |  |  |  |  |  |  |  |
Nonaccrual to outstanding, percent |  |  |  |  | 7.70% | 1.00% |  |  |  |  |  |  |  |
Financing receivable, 90 days or more past due, still accruing |  |  |  |  | $ 43,326,000 | $ 42,077,000 |  |  |  |  |  |  |  |
Fair value, option, credit risk, gains (losses) on assets |  |  |  |  | 6,322,000 | (58,068,000) | (1,845,000) |  |  |  |  |  |  |
Fair value |  |  |  |  | 283,057,000 | 214,493,000 |  |  |  |  |  |  |  |
Financing receivable, amount exceed fair value |  |  |  |  | 31,218,000 | 71,221,000 |  |  |  |  |  |  |  |
Secured Debt | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 52,500,000
Secured Debt | Term Loan | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 148,200,000 |  | $ 49,890,000 |  |  |  |  |  |  |  |  | $ 78,296,000 |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing commitment, additional funds |  |  |  |  |  |  |  | $ 3,000,000 | $ 15,470,000 |  |  |  |  |
Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable carrying value |  |  |  |  | 555,882,000 | 769,022,000 |  |  |  |  |  |  |  |
Loans receivable |  |  |  |  | 563,637,000 | 772,873,000 |  |  |  |  |  |  |  |
2018 Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market value percentage |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  |  |  | $ 625,000 | $ 369,000 | 758,000 |  |  |  |  |  |  |
Shares reserved for issuance (in shares) | shares |  |  |  |  | 236,949 | 362,986 |  |  |  |  |  |  |  |
Freedom VCM Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable at fair value |  |  |  |  | $ 20,624,000 | $ 175,795,000 |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | 200,506,000 |  |  |  |  |  |  |  |  |
Freedom VCM Holdings, LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value |  |  |  |  |  |  |  |  |  | $ 232,065,000 |  |  |  |
Freedom VCM Holdings, LLC | First Priority Security Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable at fair value |  |  |  |  | $ 200,506,000 |  |  |  |  |  |  |  |  |
Loans receivable, fair value disclosure, loan portfolio percentage |  |  |  |  | 37.70% |  |  |  |  |  |  |  |  |
W.S. Badcock Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable at fair value |  |  |  |  |  | 142,314,000 |  |  |  |  |  |  |  |
Payments to acquire finance receivables |  | $ 168,363,000 |  | $ 145,278,000 |  |  | 400,000,000 |  |  |  |  |  |  |
Nogin Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable at fair value |  |  |  |  | $ 17,980,000 |  |  |  |  |  |  |  |  |
Debtor in possession commitment fund |  |  |  |  |  |  |  |  |  |  |  | $ 17,530,000 |  |
Nogin Inc. | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debtor in possession commitment fund |  |  |  |  |  |  |  |  | 37,700,000 |  |  |  |  |
Financing commitment, additional funds |  |  |  |  |  |  |  |  | 15,500,000 |  |  |  |  |
Financing commitment, payable in kind fees |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |
Financing commitment, cash payment |  |  |  |  |  |  |  |  | $ 6,300,000 |  |  |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value (includes $387,657 and $98,729 from related parties as of December 31, 2023 and 2022, respectively) |  |  |  |  | 387,657,000 | 98,729,000 |  |  |  |  |  |  |  |
Related Party | Freedom VCM Receivables, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable at fair value |  |  |  |  | 42,183,000 |  |  |  |  |  |  |  |  |
Payments to acquire finance receivables | $ 58,872,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of financing receivable | $ (78,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate | 19.74% |  |  |  |  |  |  |  |  |  |  |  |  |
Retailer Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes payable |  |  |  |  | 62,808,000 |  |  |  |  |  |  |  |  |
Loans receivable at fair value |  |  |  |  | $ 167,568,000 |  |  |  |  |  |  |  |  |
Loans receivable, fair value disclosure, loan portfolio percentage |  |  |  |  | 31.50% |  |  |  |  |  |  |  |  |
Retailer Loan | Conn’s | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans receivable, at fair value (includes $387,657 and $98,729 from related parties as of December 31, 2023 and 2022, respectively) |  |  |  |  |  |  |  |  |  |  | $ 108,000,000 |  |  |
Other fixed income securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  | $ 145,435,000 | $ 66,495,000 | $ 51,753,000 |  |  |  |  |  |  |

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