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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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+ References

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