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Organization and Basis of Presentation (Details) |  |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 06, 2020 USD ($) | Nov. 22, 2019 USD ($) $ / shares shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) payment entity | Jun. 30, 2020 USD ($) | Mar. 31, 2021 | Dec. 31, 2020 entity | Jun. 30, 2019 shares | 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 |  |  |  |  |
Proceeds from issuance of preferred stock and warrants, net of offering costs | $ | $ 125,000,000.0 |  | $ 130,000,000.0 | $ 0 | $ 124,977,000 |  |  |  |
Number of non controlling interest subsidiaries | entity |  |  |  | 3 |  |  | 4 |  |
Percentage of outstanding OP units owned |  |  |  | 100.00% |  |  |  |  | 96.80%
Percentage of outstanding OP owned by an unaffiliated holder |  |  |  |  |  |  |  |  | 3.20%
Operating partnership units (in shares) | shares |  |  |  |  |  |  |  | 624,106 |
Delaware Trust |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 5.00% |  |  |  |  |
Investment in AS Ajax E II LLC |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  |  |  | 53.10% |  |  | 53.10% |  |
Investment in AS Ajax E II LLC | Third party |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage by third parties |  |  |  | 46.90% |  |  |  |  |
Investment in AS Ajax E II LLC | Great Ajax Corp |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  |  |  | 53.10% |  |  | 53.10% |  |
2017-D |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  |  |  | 50.00% |  |  |  |  |
2017-D | Great Ajax Corp |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  | 50.00% |  |  | 50.00% |  |
Great Ajax II REIT | Third party |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage by third parties |  |  |  | 0.10% |  |  | 0.10% |  |
Great Ajax II REIT | Great Ajax Corp |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  | 99.90% |  |  | 99.90% |  |
2018-C |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  |  |  | 37.00% |  | 37.00% |  |  | 37.00%
2018-C | Third party |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  |  |  | 63.00% |  |
Ownership percentage by third parties |  |  |  | 0.00% |  |  |  |  |
2018-C | Great Ajax Corp |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  | 100.00% |  |  |  |  |
Servicer |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 8.00% |  |  |  |  |
Thetis Asset Management LLC |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 19.80% |  |  |  |  |
Gaea Real Estate Corp. |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  | 23.20% |  | 22.90% |  |  |  |  |
Proceeds from issuance of preferred stock and warrants, net of offering costs | $ |  | $ 66,300,000 |  |  |  |  |  |  |
Private placement share issuance (in shares) | shares |  | 4,419,641 |  |  |  |  |  |  |
Purchase price per share (in usd per share) | $ / shares |  | $ 15.00 |  |  |  |  |  |  |
Gaea Real Estate Corp. | Third party |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage by third parties |  | 76.80% |  | 77.10% |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Organization And Basis Of Presentation [Line Items] |  |  |  |  |  |  |  |  |
Principal balance of small balance commercial mortgage loans (up to) | $ |  |  |  | $ 5,000,000.0 |  |  |  |  |

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