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Affiliates - Narrative (Details) $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 06, 2020 USD ($) | Nov. 22, 2019 USD ($) shares | May 29, 2018 USD ($) warrant shares | Jan. 26, 2018 USD ($) warrant shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) loanPool | Dec. 31, 2018 transaction | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 14, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock and warrants, net of offering costs | $ 125,000 |  |  |  | $ 130,000 | $ 0 | $ 124,977 |  |  |  |  |
Investment in AS Ajax E II LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  |  |  |  |  | 53.10% |  |  |  |  | 53.10% |
Investment in AS Ajax E II LLC | Third party |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by third parties |  |  |  |  |  | 46.90% |  |  |  |  |  |
Investment in AS Ajax E II LLC | Great Ajax Corp |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  |  |  |  |  | 53.10% |  |  |  |  | 53.10% |
2017-D |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  |  |  |  |  | 50.00% |  |  |  |  |  |
2017-D | Great Ajax Corp |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  |  | 50.00% |  |  |  |  | 50.00% |
Great Ajax II REIT | Third party |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by third parties |  |  |  |  |  | 0.10% |  |  |  |  | 0.10% |
Great Ajax II REIT | Great Ajax Corp |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  |  | 99.90% |  |  |  |  | 99.90% |
2018-C |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  |  |  |  |  | 37.00% |  |  | 37.00% | 37.00% |  |
2018-C | Third party |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by third parties |  |  |  |  |  | 0.00% |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  |  |  |  |  |  |  | 63.00% |
2018-C | Great Ajax Corp |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  |  | 100.00% |  |  |  |  |  |
Gaea Real Estate Corp. |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock and warrants, net of offering costs |  | $ 66,300 |  |  |  |  |  |  |  |  |  |
Private placement share issuance (in shares) | shares |  | 4,419,641 |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 23.20% |  |  |  | 22.90% |  |  |  |  |  |
Gaea Real Estate Corp. | Third party |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by third parties |  | 76.80% |  |  |  | 77.10% |  |  |  |  |  |
Ajax E Master Trust | AS Ajax E LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 5.00% |  |  |  |  |  |
AS Ajax E LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 16.50% |  |  |  |  | 16.50% | 24.20%
Thetis Asset Management LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 19.80% |  |  |  |  |  |
Unconsolidated Affiliates |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 100.00% |  |  |  |  |  |
Investment in Loan pool LLCs |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 40.40% |  |  |  |
Number of entities | loanPool |  |  |  |  |  |  |  | 3 |  |  |  |
Cash payment in business acquisition |  |  |  |  |  |  |  | $ 1,000 |  |  |  |
Great Ajax FS LLC |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 8.00% |  |  |  |  |  |
Cash payment in business acquisition |  |  | $ 700 | $ 1,100 |  |  |  |  |  |  |  |
Number of transactions | transaction |  |  |  |  |  |  |  |  | 2 |  |  |
Percentage of equity interest at closing date |  |  | 3.10% | 4.90% |  |  |  |  |  |  |  |
Number of warrants | warrant |  |  | 3 | 3 |  |  |  |  |  |  |  |
Percentage of warrants exercisable |  |  | 1.55% | 2.45% |  |  |  |  |  |  |  |
Number of shares (in shares) | shares |  |  | 29,063 | 45,938 |  |  |  |  |  |  |  |
Common stock value |  |  | $ 400 | $ 600 |  |  |  |  |  |  |  |

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