Affiliates - Schedule of Net Income, Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022	Jan. 31, 2022	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at the Company's share	$ (265)	$ (355)	$ (363)	$ (418)
Assets at company share	1,405,690		1,405,690		$ 1,484,426
Liabilities at company share	1,088,850		1,088,850		1,146,961
AS Ajax E LLC
Schedule of Equity Method Investments [Line Items]
Assets at company share	446		446		467
Liabilities at company share	0		0		0
Thetis Asset Management LLC
Schedule of Equity Method Investments [Line Items]
Assets at company share	1,052		1,052		1,376
Liabilities at company share	312		312		527
Loan pool LLCs
Schedule of Equity Method Investments [Line Items]
Assets at company share	480		480		480
Liabilities at company share	80		80		64
Great Ajax FS LLC
Schedule of Equity Method Investments [Line Items]
Assets at company share	7,456		7,456		6,270
Liabilities at company share	6,286		6,286		5,306
Gaea Real Estate Corp.
Schedule of Equity Method Investments [Line Items]
Assets at company share	35,879		35,879		35,894
Liabilities at company share	13,643		13,643		$ 12,818
AS Ajax E LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	56	21	122	40
Net income/(loss) at the Company's share	$ 9	4	$ 20	7
Ownership percentage (in percent)	16.50%		16.50%		16.50%
AS Ajax E LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 2,708		$ 2,708		$ 2,837
AS Ajax E LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	1		1		$ 2
Loan pool LLCs
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	(16)	(12)	(40)	(32)
Net income/(loss) at the Company's share	$ (6)	(5)	$ (16)	(13)
Ownership percentage (in percent)	40.00%		40.00%		40.00%		40.40%
Loan pool LLCs | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 1,200		$ 1,200		$ 1,201
Loan pool LLCs | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	200		200		$ 161
Thetis Asset Management LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	(147)	(357)	(136)	(563)
Net income/(loss) at the Company's share	$ (29)	(71)	$ (27)	(112)
Ownership percentage (in percent)	19.80%		19.80%		19.80%
Thetis Asset Management LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 5,311		$ 5,311		$ 6,948
Thetis Asset Management LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	1,573		1,573		$ 2,661
Great Ajax FS LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	(211)	(2,119)	(974)	(3,276)
Net income/(loss) at the Company's share	$ (20)	(170)	$ (87)	(263)
Ownership percentage (in percent)	9.60%		9.60%		8.00%
Great Ajax FS LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 77,753		$ 77,753		$ 78,375
Great Ajax FS LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	65,558		65,558		$ 66,324
Gaea Real Estate Corp.
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	(1,227)	(644)	(2,332)	(453)
Assets and liabilities at 100%						$ 25,500
Net income/(loss) at the Company's share	$ (270)	$ (143)	$ (513)	$ (101)
Ownership percentage (in percent)	22.00%		22.00%		22.00%
Gaea Real Estate Corp. | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 163,161		$ 163,161		$ 162,933
Gaea Real Estate Corp. | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 62,040		$ 62,040		$ 58,185
Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percent)	100.00%	100.00%	100.00%	100.00%	100.00%