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Organization and Basis of Presentation (Details Textuals)		3 Months Ended	6 Months Ended
	Nov. 22, 2019 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) numberOfLoanPools	Jun. 30, 2020 USD ($) payment numberOfLoanPools	Jun. 30, 2019 USD ($) shares	Dec. 31, 2019 numberOfLoanPools	Dec. 31, 2018
Organization And Basis Of Presentation [Line Items]
Number of payments made on RPL mortgage loans (at least) | payment			5
Number of Recent Payments Made on RPL Mortgage Loans | payment			7
Number of payments made on NPL mortgage loans | payment			3
Number of non controlling interest subsidiaries | numberOfLoanPools		4	4		4
Percentage of ownership interests in joint venture		34.00%	34.00%
Proceeds from issuance of preferred stock and warrants, net of offering costs | $		$ 130,000,000.0	$ 124,977,000	$ 0
Percentage of outstanding OP units owned		100.00%	100.00%		100.00%	96.80%
Percentage of outstanding OP owned by an unaffiliated holder						3.20%
Operating partnership units | shares				624,106
Maximum
Organization And Basis Of Presentation [Line Items]
Principal balance of small balance commercial mortgage loans (up to) | $		$ 5,000,000.0	$ 5,000,000.0
Delaware Trust
Organization And Basis Of Presentation [Line Items]
Ownership percentage		5.00%	5.00%
2018-C | Great Ajax Corp
Organization And Basis Of Presentation [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		63.00%	63.00%		63.00%
2017-D
Organization And Basis Of Presentation [Line Items]
Percentage of ownership interests in joint venture		50.00%	50.00%
2017-D | Great Ajax Corp
Organization And Basis Of Presentation [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		50.00%	50.00%		50.00%
AS Ajax E II LLC
Organization And Basis Of Presentation [Line Items]
Percentage of ownership interests in joint venture		53.10%	53.10%		53.10%
AS Ajax E II LLC | Third Party
Organization And Basis Of Presentation [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		46.90%	46.90%
Great Ajax II REIT
Organization And Basis Of Presentation [Line Items]
Company ownership percentage			99.80%
Great Ajax II REIT | Third Party
Organization And Basis Of Presentation [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		0.20%	0.20%
Great Ajax II REIT | Great Ajax Corp
Organization And Basis Of Presentation [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent					99.80%
Gaea
Organization And Basis Of Presentation [Line Items]
Ownership percentage	23.20%
Share Price | $ / shares	$ 15.00
Proceeds from issuance of preferred stock and warrants, net of offering costs | $	$ 66,300,000
Private placement share issuance | shares	4,419,641
Gaea | Third Party
Organization And Basis Of Presentation [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	76.80%
Thetis
Organization And Basis Of Presentation [Line Items]
Ownership percentage		19.80%	19.80%
Great Ajax FS
Organization And Basis Of Presentation [Line Items]
Ownership percentage		8.00%	8.00%

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