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Debt - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2024 USD ($) | Aug. 31, 2022 USD ($) | Sep. 30, 2024 USD ($) loanPool securitization | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) securitization facility trust | Sep. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Feb. 26, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of outstanding facility | loanPool |  |  | 1 |  |  |  |  |  |  |  |
Percentage of guarantors beneficial interest (in percentage) |  |  | 100.00% |  | 100.00% |  |  |  |  |  |
Cash collateral |  |  | $ 0 |  | $ 0 |  |  |  | $ 3,756,000 |  |
Convertible senior notes |  |  | 0 |  | 0 |  |  |  | 103,516,000 |  |
Proceeds used to repurchase and retire securities |  |  | 0 | $ 16,154,000 | 0 | $ 16,154,000 | $ 0 |  | $ 16,644,000 | $ 15,614,000 | $ 12,153,000
Convertible notes payable |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  | $ 0 | 1,900,000 | $ 300,000 | 5,900,000 |  |  |  |  |
Repurchase agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate (in percent) |  |  | 6.16% |  | 6.16% |  |  |  | 7.44% |  |
Amount outstanding |  |  | $ 231,464,000 |  | $ 231,464,000 |  |  |  | $ 375,745,000 |  |
Servicing agreement | Minimum | Gregory Funding LLC |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Servicing fee rate, loans securitization (in percent) |  |  | 0.42% |  | 0.42% |  |  |  |  |  |
Mortgage loans | Non-rated secured borrowings |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of securitizations outstanding | securitization |  |  | 0 |  | 0 |  |  |  |  |  |
Mortgage loans | Rated secured borrowings |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of securitizations outstanding | securitization |  |  | 4 |  | 4 |  |  |  |  |  |
Mortgage loans | Repurchase agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of facilities repurchased | facility |  |  |  |  | 4 |  |  |  |  |  |
Convertible notes payable |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 103,500,000 |  |  |  |  |  |  |  |  |  |
Accrued interest period (in days) | 15 days |  |  |  |  |  |  |  |  |  |
Unpaid principal balance |  |  | $ 0 |  | $ 0 |  |  |  |  |  |
Interest rate (in percent) |  |  | 7.25% |  | 7.25% |  |  |  |  |  |
Interest expense |  |  | $ 2,700,000 | 2,700,000 | $ 7,400,000 | 7,900,000 |  |  |  |  |
Amortization of debt discount |  |  | 0 | 0 | 0 | 200,000 |  |  |  |  |
Amortization of debt discount and deferred expenses |  |  | 200,000 | $ 200,000 | $ 600,000 | $ 600,000 |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis points |  |  |  |  | 1.00% |  |  |  |  |  |
Senior notes | 8.875% Senior Unsecured Notes Due September 2027 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate (in percent) |  | 8.875% |  |  |  |  |  |  |  |  |
Aggregate principal |  | $ 110,000,000.0 |  |  |  |  |  |  |  |  |
Debt instrument, term (in years) |  | 5 years |  |  |  |  |  |  |  |  |
Issuance amount, amount of par value (percent) |  | 0.99009 |  |  |  |  |  |  |  |  |
Proceeds from unsecured notes payable |  | $ 106,100,000 |  |  |  |  |  |  |  |  |
Proceeds used to repurchase and retire securities |  |  | 90,000,000.0 |  | $ 90,000,000.0 |  |  |  |  |  |
Amount outstanding |  |  | $ 110,000,000.0 |  | $ 110,000,000.0 |  |  |  | 110,000,000.0 |  |
Interest rate, effective percentage |  |  | 10.24% | 9.98% | 10.24% | 9.98% |  |  |  |  |
Senior notes | 9.875% Senior Unsecured Notes Due September 2027 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate (in percent) |  |  | 9.875% |  | 9.875% |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs, net |  |  | $ 2,600,000 |  | $ 2,600,000 |  |  |  | $ 3,200,000 |  |
Line of Credit | Rithm | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal |  |  |  |  |  |  |  | $ 70,000,000.0 |  |  |
Amount outstanding |  |  | $ 0 |  | $ 0 |  |  |  |  |  |
Delaware Trust | Mortgage loans | Repurchase agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of facilities repurchased | facility |  |  |  |  | 2 |  |  |  |  |  |
Number of wholly-owned Delaware trusts | trust |  |  |  |  | 2 |  |  |  |  |  |
Delaware Trust | Mortgage loans | Repurchase agreement | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of purchase price for each mortgage loan or REO (in percentage) |  |  |  |  | 75.00% |  |  |  |  |  |
Delaware Trust | Mortgage loans | Repurchase agreement | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of purchase price for each mortgage loan or REO (in percentage) |  |  |  |  | 90.00% |  |  |  |  |  |

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