Affiliates - Schedule of Net Income, Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 31, 2022	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at the Company's share	$ (1,308)	$ (1,218)	$ 699
Assets at Company share	1,336,291	1,484,426
Liabilities at Company share	1,025,396	1,146,961
Thetis Asset Management LLC
Schedule of Equity Method Investments [Line Items]
Assets at Company share	919	1,376
Liabilities at Company share	258	527
AS Ajax E LLC
Schedule of Equity Method Investments [Line Items]
Assets at Company share	420	467
Liabilities at Company share	6	0
Investment in Loan pool LLCs
Schedule of Equity Method Investments [Line Items]
Assets at Company share	480	480
Liabilities at Company share	93	64
Great Ajax FS LLC
Schedule of Equity Method Investments [Line Items]
Assets at Company share	6,854	6,270
Liabilities at Company share	5,748	5,306
Investment in Gaea
Schedule of Equity Method Investments [Line Items]
Assets at Company share	37,272	35,894
Liabilities at Company share	16,346	12,818
AS Ajax E LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	242	124	198
Net income/(loss) at the Company's share	$ 40	$ 20	33
Ownership percentage (in percent)	16.50%	16.50%
AS Ajax E LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 2,553	$ 2,837
AS Ajax E LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	39	2
Investment in Loan pool LLCs
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	(72)	(110)	(126)
Net income/(loss) at the Company's share	$ (28)	$ (44)	(51)
Ownership percentage (in percent)	40.00%	40.00%			40.40%
Investment in Loan pool LLCs | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 1,200	$ 1,201
Investment in Loan pool LLCs | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	232	161
Thetis Asset Management LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	1,901	(658)	3,297
Net income/(loss) at the Company's share	$ 376	$ (130)	653
Ownership percentage (in percent)	19.80%	19.80%
Thetis Asset Management LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 4,643	$ 6,948
Thetis Asset Management LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	1,305	2,661
Investment in Gaea
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	(9,715)	(3,204)	222
Assets and liabilities at 100%				$ 25,500
Net income/(loss) at the Company's share	$ (1,898)	(707)	51
Ownership percentage (in percent)	22.20%
Investment in Gaea | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 167,591	162,933
Investment in Gaea | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	73,499	58,185
Great Ajax FS LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	(1,633)	(6,999)	(1,363)
Net income/(loss) at the Company's share	$ (150)	$ (560)	$ (109)
Ownership percentage (in percent)	9.50%	8.00%
Great Ajax FS LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 71,477	$ 78,375
Great Ajax FS LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and liabilities at 100%	$ 59,949	$ 66,324
Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Ownership percentage (in percent)	100.00%	100.00%	100.00%