Fair Value of Assets and Liabilities - Schedule of Changes in Level 3 Fair Value Assets and Liabilities on a Recurring Basis (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Liabilities | ||||
| Beginning balance, Total | $ 50,800 | $ 142,889 | $ 65,837 | $ 178,755 |
| Originations | 769,890 | 661,882 | 1,469,488 | 1,195,515 |
| Principal repayments | (11,694) | (28,300) | (25,179) | (60,272) |
| Borrower Loans sold to third parties | (770,962) | (662,031) | (1,469,972) | (1,195,541) |
| Other changes | (250) | (501) | (391) | (709) |
| Changes in fair value | (649) | (1,646) | (2,648) | (5,455) |
| Ending balance, Total | 37,135 | 112,293 | 37,135 | 112,293 |
| Prosper Funding LLC | ||||
| Liabilities | ||||
| Beginning balance, Total | 2,464 | 2,862 | 1,437 | 2,548 |
| Originations | 769,890 | 661,882 | 1,469,488 | 1,195,515 |
| Principal repayments | 223 | (309) | 1,275 | 388 |
| Borrower Loans sold to third parties | (770,962) | (662,031) | (1,469,972) | (1,195,541) |
| Other changes | (63) | (159) | 8 | (19) |
| Changes in fair value | 144 | 432 | (540) | (214) |
| Ending balance, Total | 1,696 | 2,677 | 1,696 | 2,677 |
| Notes | ||||
| Liabilities | ||||
| Beginning balance, Liabilities | (230,283) | (272,500) | (243,900) | (283,030) |
| Purchases of Borrower Loans/Issuance of Notes | (37,638) | (42,443) | (71,984) | (84,582) |
| Principal repayments | 41,680 | 46,917 | 83,623 | 94,781 |
| Borrower Loans sold to third parties | 0 | 0 | 0 | 0 |
| Other changes | 113 | 57 | 408 | 337 |
| Change in fair value | 5,058 | 3,968 | 10,783 | 8,493 |
| Ending balance, Liabilities | (221,070) | (264,001) | (221,070) | (264,001) |
| Notes | Prosper Funding LLC | ||||
| Liabilities | ||||
| Beginning balance, Liabilities | (230,283) | (272,500) | (243,900) | (283,030) |
| Purchases of Borrower Loans/Issuance of Notes | (37,638) | (42,443) | (71,984) | (84,582) |
| Principal repayments | 41,680 | 46,917 | 83,623 | 94,781 |
| Borrower Loans sold to third parties | 0 | 0 | 0 | 0 |
| Other changes | 113 | 58 | 408 | 338 |
| Change in fair value | 5,058 | 3,967 | 10,783 | 8,492 |
| Ending balance, Liabilities | (221,070) | (264,001) | (221,070) | (264,001) |
| Borrower Loans | ||||
| Assets | ||||
| Beginning balance, Assets | 281,083 | 415,389 | 309,737 | 461,785 |
| Purchases of Borrower Loans/Issuance of Notes | 37,913 | 42,895 | 73,639 | 85,833 |
| Principal repayments | (53,374) | (75,217) | (108,802) | (155,053) |
| Borrower Loans sold to third parties | (1,347) | (601) | (2,139) | (1,277) |
| Other changes | (363) | (558) | (799) | (1,046) |
| Changes in fair value | (5,707) | (5,614) | (13,431) | (13,948) |
| Ending balance, Assets | 258,205 | 376,294 | 258,205 | 376,294 |
| Borrower Loans | Prosper Funding LLC | ||||
| Assets | ||||
| Beginning balance, Assets | 232,747 | 275,362 | 245,337 | 285,578 |
| Purchases of Borrower Loans/Issuance of Notes | 37,913 | 42,895 | 73,639 | 85,833 |
| Principal repayments | (41,457) | (47,226) | (82,348) | (94,393) |
| Borrower Loans sold to third parties | (1,347) | (601) | (2,139) | (1,277) |
| Other changes | (176) | (217) | (400) | (357) |
| Changes in fair value | (4,914) | (3,535) | (11,323) | (8,706) |
| Ending balance, Assets | 222,766 | 266,678 | 222,766 | 266,678 |
| Loans Held For Sale | ||||
| Assets | ||||
| Beginning balance, Assets | 0 | 0 | 0 | 0 |
| Purchases of Borrower Loans/Issuance of Notes | 769,615 | 661,430 | 1,467,833 | 1,194,264 |
| Principal repayments | 0 | 0 | 0 | |
| Borrower Loans sold to third parties | (769,615) | (661,430) | (1,467,833) | (1,194,264) |
| Other changes | 0 | 0 | 0 | 0 |
| Changes in fair value | 0 | 0 | 0 | 0 |
| Ending balance, Assets | 0 | 0 | 0 | 0 |
| Loans Held For Sale | Prosper Funding LLC | ||||
| Assets | ||||
| Beginning balance, Assets | 0 | 0 | 0 | 0 |
| Purchases of Borrower Loans/Issuance of Notes | 769,615 | 661,430 | 1,467,833 | 1,194,264 |
| Principal repayments | 0 | 0 | 0 | 0 |
| Borrower Loans sold to third parties | (769,615) | (661,430) | (1,467,833) | (1,194,264) |
| Other changes | 0 | 0 | 0 | 0 |
| Changes in fair value | 0 | 0 | 0 | 0 |
| Ending balance, Assets | $ 0 | $ 0 | $ 0 | $ 0 |