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LONG-TERM DEBT - Senior Secured Term Loans and New Facility (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 19, 2025 | Apr. 30, 2018 | Feb. 19, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Apr. 03, 2025
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior secured term loans |  |  |  | $ 171,888 |  | $ 171,888 |  | $ 232,800 |
Debt exchange transaction expenses | $ 3,600 |  |  | 194 | $ 0 | 3,646 | $ 0 |  |
Long-term debt |  |  |  | $ 192,493 |  | $ 192,493 |  | 230,544 |
Price of warrant or right (in usd per share) |  |  |  | $ 0.01 |  | $ 0.01 |  |  | $ 1.95
Debt issuance and amendment costs |  |  |  | $ 1,000 |  | $ 1,000 |  | 900 |
Accumulated amortization of debt issuance and amendment costs |  |  |  | $ (9,000) |  | $ (9,000) |  | $ (8,500) |
Altisource S.A.R.L. | Deer Park Road Management Company, LP |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling ownership (in percent) |  |  |  | 13.00% |  | 13.00% |  | 16.00% |
Altisource S.A.R.L. | UBS Stakeholder Warrants |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling ownership (in percent) |  |  |  | 22.00% |  | 22.00% |  |  |
Altisource S.A.R.L. | Benefit Street Partners L.L.C. |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling ownership (in percent) |  |  |  | 16.00% |  | 16.00% |  |  |
Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt conversion, converted instrument, shares issued (in shares) | 7,300,000 |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 110,000 |  | $ 110,000 |  |  |  |  |  |
Upfront fee | 50,000 |  |  |  |  |  |  |  |
April 2018 Credit Agreement | Term B Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 412,000 |  |  |  |  |  |  |
April 2018 Credit Agreement | Term B Loans | Deer Park Road Management Company, LP | Altisource S.A.R.L. |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 19,900 |  | $ 19,900 |  | $ 42,100 |
Interest received |  |  |  | 400 | $ 400 | 1,500 | $ 1,100 |  |
Warrant shares (in shares) |  |  |  |  |  |  |  |  | 1,900,000
Price of warrant or right (in usd per share) |  |  |  |  |  |  |  |  | $ 9.5998
April 2018 Credit Agreement | Term B Loans | UBS Stakeholder Warrants | Altisource S.A.R.L. |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | 63,900 |  | 63,900 |  |  |
Interest received |  |  |  | 1,300 |  | 4,200 |  |  |
Warrant shares (in shares) |  |  |  |  |  |  |  |  | 200,000
Price of warrant or right (in usd per share) |  |  |  |  |  |  |  |  | $ 9.5998
April 2018 Credit Agreement | Term B Loans | Benefit Street Partners L.L.C. | Altisource S.A.R.L. |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | 30,900 |  | 30,900 |  |  |
Interest received |  |  |  | $ 600 |  | $ 1,600 |  |  |
Warrant shares (in shares) |  |  |  |  |  |  |  |  | 2,200,000
Price of warrant or right (in usd per share) |  |  |  |  |  |  |  |  | $ 9.5998
April 2018 Credit Agreement | Term B Loans | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Amount of principal or interest if failed to pay considered as event of default |  | 10,000 |  |  |  |  |  |  |
Amount of debt which results in acceleration of debt if failed to pay considered as event of default |  | 10,000 |  |  |  |  |  |  |
Amount of unbonded, undischarged or unstayed debt under entry by court of one or more judgments for certain period to determine as event of default |  | $ 15,000 |  |  |  |  |  |  |
April 2018 Credit Agreement | Line of Credit | Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Payment due date default period |  | 5 days |  |  |  |  |  |  |
Senior Secured Term Loans |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior secured term loans | 232,800 |  | 232,800 |  |  |  |  |  |
Senior Secured Term Loans | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior secured term loans | 232,800 |  | 232,800 |  |  |  |  |  |
New First Lien Loan | Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior secured term loans | 160,000 |  | 160,000 |  |  |  |  |  |
New First Lien Loan | Insurance Or Condemnation Proceeds |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, required prepayment on insurance or condemnation proceeds in excess of | $ 10,000 |  |  |  |  |  |  |  |
New First Lien Loan | Fiscal Year 2025 Scenarios |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, prepayment (in percent) | 75.00% |  |  |  |  |  |  |  |
Debt instrument, required prepayment resulting in cash on hand of no less than | $ 30,000 |  |  |  |  |  |  |  |
New First Lien Loan | Maturity Date Two |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior secured term loans | 158,100 |  | 158,100 |  |  |  |  |  |
New First Lien Loan | Maturity Date One |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior secured term loans | 1,400 |  | 1,400 |  |  |  |  |  |
New First Lien Loan | Line of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Senior secured term loans | $ 160,000 |  | $ 160,000 |  |  |  |  |  |
New First Lien Loan | Line of Credit | Secured Debt | Base Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) | 5.50% |  |  |  |  |  |  |  |
New First Lien Loan | Line of Credit | Secured Debt | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) |  |  |  |  |  | 10.90% |  |  |
New First Lien Loan | Line of Credit | Secured Debt | Secured Overnight Financing Rate (SOFR) | Variable Rate Component One, Paid In Cash |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) |  |  | 5.00% |  |  |  |  | 5.00% |
New First Lien Loan | Line of Credit | Secured Debt | Payment in Kind (PIK) Note |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) |  |  |  |  |  |  |  | 3.75% |
New First Lien Loan | Line of Credit | Proceeds Of Debt Not Permitted By Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, prepayment (in percent) | 100.00% |  |  |  |  |  |  |  |
New First Lien Loan | Line of Credit | Proceeds From Exercise Of Warrants |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, prepayment (in percent) | 95.00% |  |  |  |  |  |  |  |
New First Lien Loan | Line of Credit | Proceeds Of Asset Sales |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, prepayment (in percent) | 100.00% |  |  |  |  |  |  |  |
Debt instrument, required prepayment subject to customary reinvestment rights | $ 3,000 |  |  |  |  |  |  |  |
New First Lien Loan | Line of Credit | Insurance Or Condemnation Proceeds |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, prepayment (in percent) | 100.00% |  |  |  |  |  |  |  |
New First Lien Loan | Senior Notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) | 6.50% |  |  |  |  | 10.90% |  |  |
New First Lien Loan | Senior Notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate, Floor |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate margin (in percent) | 3.50% |  |  |  |  |  |  |  |

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