| Line Item | Jun 30, 2026 | Dec 31, 2025 | Sep 30, 2025 | Jun 30, 2025 | Dec 31, 2024 | Sep 30, 2024 | Jun 30, 2024 | Mar 31, 2024 | Dec 31, 2023 | Sep 30, 2023 | Jun 30, 2023 | Mar 31, 2023 | Dec 31, 2022 | Sep 30, 2022 | Jun 30, 2022 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Interest income | |||||||||||||||
| Warehouse credit facility | |||||||||||||||
| Securitization debt | |||||||||||||||
| Total interest expense | |||||||||||||||
| Net interest income | |||||||||||||||
| Realized and unrealized losses, net of recoveries | |||||||||||||||
| Net interest income (loss) after losses and recoveries | — | ||||||||||||||
| Servicing income | |||||||||||||||
| Warranties and GAP income, net | |||||||||||||||
| CarStory revenue | |||||||||||||||
| Gain on debt extinguishment | — | — | — | ||||||||||||
| Other income | |||||||||||||||
| Total noninterest income | |||||||||||||||
| Compensation and benefits | |||||||||||||||
| Professional fees | |||||||||||||||
| Software and IT costs | |||||||||||||||
| Depreciation and amortization | |||||||||||||||
| Interest expense on corporate debt | |||||||||||||||
| Impairment charges | — | — | |||||||||||||
| Other expenses | |||||||||||||||
| Total expenses | |||||||||||||||
| Loss from continuing operations before reorganization items and provision for income taxes | — | — | |||||||||||||
| Reorganization items, net | — | — | — | ||||||||||||
| (Loss) income from continuing operations before provision for income taxes | |||||||||||||||
| (Benefit) provision for income taxes from continuing operations | |||||||||||||||
| Net income (loss) from continuing operations | |||||||||||||||
| Net income (loss) from | |||||||||||||||
| Preferred stock dividends attributable to noncontrolling interests of subsidiary | — | — | |||||||||||||
| Net (loss) income attributable to controlling interest and common shareholders | — | — | |||||||||||||
| Net (loss) income per share attributable to common stockholders, continuing operations, basic | |||||||||||||||
| Net (loss) income per share attributable to common stockholders, Discontinued operations, basic | |||||||||||||||
| Net (loss) income per share attributable to common stockholders, basic | |||||||||||||||
| Net (loss) income per share attributable to common stockholders, diluted |