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Debt - Narrative (Details) | 3 Months Ended | 6 Months Ended | 89 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) securitization $ / shares | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) Facility Day securitization counterparty trust $ / shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) securitization $ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2018 | Apr. 25, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of guarantors beneficial interest |  | 100.00% |  |  |  |  | 100.00% |  | 100.00% |  |  |
Cash collateral |  | $ 5,860,000 |  |  |  |  | $ 5,860,000 |  | $ 5,860,000 | $ 4,653,000 |  |
Number of securitizations completed | securitization |  |  |  |  |  |  |  |  | 18 |  |  |
Number of securitizations outstanding | securitization |  | 5 |  |  |  |  | 5 |  | 5 |  |  |
Convertible senior notes, net | [1] | $ 103,427,000 |  |  |  |  | $ 103,427,000 |  | $ 103,427,000 | $ 110,057,000 |  |
Interest expense |  | 8,830,000 |  |  | $ 13,058,000 |  | 19,134,000 | $ 26,128,000 |  |  |  |
Convertible notes payable |  | 5,000,000.0 | $ 2,500,000 | $ 2,500,000 |  | $ 8,000,000.0 | 5,000,000.0 |  | 5,000,000.0 |  |  |
Payments for repurchase of convertible notes |  | 5,100,000 | 2,400,000 | 2,300,000 |  | 8,200,000 | 5,100,000 |  | 5,100,000 |  |  |
Convertible senior notes repurchase |  | 0 | $ 0 | $ 0 |  | $ 81,000 |  |  |  |  |  |
Servicer |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ceiling for each repurchase facility |  | $ 12,000,000.0 |  |  |  |  | $ 12,000,000.0 |  | $ 12,000,000.0 |  |  |
2018-C | Class A Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Interest retained by the Company |  |  |  |  |  |  | 5.00% |  |  |  |  |
Percentage of settled outstanding notes |  |  | 0.95 |  |  |  |  |  |  |  |  |
Securitization Trust, 2018-C |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  | 37.00% | 37.00% |  |  |  | 37.00% |  | 37.00% |  | 37.00% |
Securitization Trust, 2018-C | Third party |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  |  |  |  |  |  | 63.00% |  |
Convertible notes payable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unpaid principal balance |  | $ 105,900,000 |  |  |  |  | $ 105,900,000 |  | $ 105,900,000 | $ 113,400,000 |  |
Interest expense |  | $ 2,200,000 |  |  | 2,500,000 |  | $ 4,600,000 | 4,900,000 |  |  |  |
Master repurchase agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  | 1.48% |  |  |  |  | 1.48% |  | 1.48% | 2.29% |  |
Servicing agreement | Minimum | Servicer |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Servicing fees percentage |  |  |  |  |  |  | 0.65% |  |  |  |  |
Servicing agreement | Maximum | Servicer |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Servicing fees percentage |  |  |  |  |  |  | 1.25% |  |  |  |  |
Mortgage loans | Non-rated secured borrowings |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of securitizations outstanding | securitization |  | 1 |  |  |  |  | 1 |  | 1 |  |  |
Mortgage loans | Rated secured borrowings |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of securitizations outstanding | securitization |  | 4 |  |  |  |  | 4 |  | 4 |  |  |
Mortgage loans | Ajax Mortgage Loan Trust 2017-D/ December 2017 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  |  | 50.00% |  |  |  |  |  |  |  |  |
Mortgage loans | Delaware Trust | Master repurchase agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities repurchased | Facility |  |  |  |  |  |  | 2 |  |  |  |  |
Number of wholly-owned Delaware trusts | trust |  |  |  |  |  |  | 2 |  |  |  |  |
Number of counterparties | counterparty |  |  |  |  |  |  | 2 |  |  |  |  |
Ceiling for each repurchase facility |  | $ 250,000,000.0 |  |  |  |  | $ 250,000,000.0 |  | $ 250,000,000.0 |  |  |
Mortgage loans | Delaware Trust | Master repurchase agreement | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of purchase price for each mortgage loan or REO |  |  |  |  |  |  | 70.00% |  |  |  |  |
Mortgage loans | Delaware Trust | Master repurchase agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of purchase price for each mortgage loan or REO |  |  |  |  |  |  | 85.00% |  |  |  |  |
Mortgages one | Delaware Trust | Master repurchase agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ceiling for each repurchase facility |  | 400,000,000.0 |  |  |  |  | $ 400,000,000.0 |  | $ 400,000,000.0 |  |  |
Bonds | Delaware Trust | Master repurchase agreement |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of facilities repurchased | Facility |  |  |  |  |  |  | 5 |  |  |  |  |
Convertible notes payable |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  |  |  |  | 7.25%
Principal amount of note (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 25.00 |  |  |  |  |
If-converted value in excess of principal |  |  |  |  |  |  | $ 10,900,000 |  |  |  |  |
Amortization of debt discount |  | $ 400,000 |  |  | $ 400,000 |  | $ 700,000 | $ 700,000 |  |  |  |
Interest rate, effective percentage |  | 8.99% |  |  | 9.09% |  | 8.99% | 9.09% | 8.99% |  |  |
Threshold percentage of stock price trigger (at least) |  |  |  |  |  |  | 130.00% |  |  |  |  |
Threshold trading days (at least) | Day |  |  |  |  |  |  | 20 |  |  |  |  |
Threshold consecutive trading days | Day |  |  |  |  |  |  | 30 |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 100.00% |  |  |  |  |
Convertible notes payable | Common stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate |  |  |  |  |  |  | 1.7279 |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 14.47 |  |  |  |  | $ 14.47 |  | $ 14.47 |  |  |
[1] | Secured borrowings, net are presented net of deferred issuance costs of $9.5 million at June 30, 2021 and $5.4 million at December 31, 2020. Convertible senior notes, net are presented net of deferred issuance costs of $2.4 million at June 30, 2021 and $3.3 million at December 31, 2020.

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