Summary of Significant Accounting Policies (Details) - USD ($)						3 Months Ended			12 Months Ended
		Jan. 01, 2022	Jun. 30, 2020	Jan. 01, 2020	Jun. 07, 2016	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2020	Dec. 31, 2021	Apr. 25, 2017
Summary Of Significant Accounting Policies [Line Items]
Amount of loan discount reclassified				$ (10,200,000)
Proceeds from issuance of private placement								$ 125,000,000
Warrant term			5 years					5 years
Class of warrant or right, outstanding (in shares)			6,500,000			6,500,000	6,500,000	6,500,000
Investment warrants, exercise price (in dollars per share)			$ 10.00					$ 10.00
Warrants original basis			$ 9,500,000					$ 9,500,000
Reclass of conversion premium - convertible notes						$ 485,134,000			$ 497,295,000
Convertible senior notes, net	[1]					103,749,000			102,845,000
Convertible notes payable							$ 2,500,000
Payments for repurchase of convertible notes							$ 2,400,000
Repayments of convertible debt						$ 0
Percentage of incentive fees payable in cash						100.00%
Number of shares available under for distribution (in shares)						60,000
Percentage of shares vesting					5.00%
Minimum assets with banking institutions						$ 1,000,000,000
Director
Summary Of Significant Accounting Policies [Line Items]
Annual retainer amount		$ 140,000							$ 100,000
Percentage of annual retainer received in shares		50.00%							40.00%
Percentage of annual retainer received in cash		50.00%							60.00%
Convertible notes payable
Summary Of Significant Accounting Policies [Line Items]
Unpaid principal balance									$ 104,600,000
Accounting Standards Update 2020-06
Summary Of Significant Accounting Policies [Line Items]
Convertible senior notes, net						$ 700,000
Restricted stock | Director
Summary Of Significant Accounting Policies [Line Items]
Shares granted (in shares)						0	2,000
Gregory Funding LLC | Servicing agreement
Summary Of Significant Accounting Policies [Line Items]
Percentage of fair market value of REO						1.00%
Percentage of purchase price of REO						1.00%
Renewal term						1 year
Thetis Asset Management LLC | Amended and restated management agreement
Summary Of Significant Accounting Policies [Line Items]
Period of common shares held as base management fee (at least)						3 years
Convertible notes payable
Summary Of Significant Accounting Policies [Line Items]
Unpaid principal balance						$ 104,600,000			$ 104,600,000
Interest rate										7.25%
Principal amount of note (in dollars per share)						$ 25.00
Common stock | Convertible notes payable
Summary Of Significant Accounting Policies [Line Items]
Conversion rate						1.7405
Conversion price (in dollars per share)						$ 14.36
Additional Paid-in Capital | Accounting Standards Update 2020-06
Summary Of Significant Accounting Policies [Line Items]
Reclass of conversion premium - convertible notes						$ (700,000)
Put option
Summary Of Significant Accounting Policies [Line Items]
Present value of put liability			$ 50,700,000					$ 50,700,000
Put option liability term			39 months
Preferred stock - Series A shares
Summary Of Significant Accounting Policies [Line Items]
Preferred stock, shares issued (in shares)			2,307,400			2,307,400		2,307,400	2,307,400
Preferred stock, fixed-to-floating rate cumulative redeemable						7.25%		7.25%	7.25%
Preferred stock, liquidation preference per share (in dollars per share)						$ 25.00			$ 25.00
Preferred stock - Series B shares
Summary Of Significant Accounting Policies [Line Items]
Preferred stock, shares issued (in shares)			2,892,600			2,892,600		2,892,600	2,892,600
Preferred stock, fixed-to-floating rate cumulative redeemable						5.00%		5.00%	5.00%
Preferred stock, liquidation preference per share (in dollars per share)						$ 25.00			$ 25.00
Minimum | Gregory Funding LLC | Servicing agreement
Summary Of Significant Accounting Policies [Line Items]
Servicing fees percentage						0.65%
Maximum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of an assets						27 years 6 months
Maximum | Gregory Funding LLC | Servicing agreement
Summary Of Significant Accounting Policies [Line Items]
Servicing fees percentage						1.25%

[1] Secured borrowings, net are presented net of deferred issuance costs of $6.5 million at March 31, 2022 and $7.3 million at December 31, 2021. Convertible senior notes, net are presented net of deferred issuance costs of $0.8 million and $1.7 million at March 31, 2022 and December 31, 2021, respectively.