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Subsequent Events - Additional Information (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 14, 2020 | Jul. 01, 2020 USD ($) | Jul. 27, 2020 USD ($) tenant shares | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jul. 08, 2020
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Gain on sale of real estate, net |  |  |  | $ 0 | $ 0 | $ (12) | $ 2,952 |
Repayments on mortgage notes |  |  |  |  |  | $ 24,391 | 30,958 |
Annual base management fee, in percentage of stockholders' equity, adjusted to unrealized gains or losses (as percent) |  |  |  |  |  | 1.50% |  |
Quarterly base management fee, in percentage of stockholders' equity, adjusted to unrealized gains or losses (as percent) |  |  |  |  |  | 0.375% |  |
Variable rate mortgage loans |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Repayments on mortgage notes |  |  |  |  |  | $ 12,107 |  |
Fixed rate mortgage loans |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Repayments on mortgage notes |  |  |  |  |  | 5,918 |  |
Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Rent obligations collected (as percent) |  |  | 99.00% |  |  |  |  |
Number of tenants granted rent deferrals | tenant |  |  | 3 |  |  |  |  |
Rent obligations deferred (as percent) |  |  | 2.00% |  |  |  |  |
Annual base management fee, in percentage of stockholders' equity, adjusted to unrealized gains or losses (as percent) | 0.425% |  |  |  |  |  |  |
Quarterly base management fee, in percentage of stockholders' equity, adjusted to unrealized gains or losses (as percent) | 0.10625% |  |  |  |  |  |  |
Subsequent Event | Richmond, Virginia |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Lease term (in years) |  |  |  |  |  |  |  | 6 years
Subsequent Event | Variable rate mortgage loans | Maple Heights, Ohio |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Repayments on mortgage notes |  | $ 4,000 |  |  |  |  |  |
Disposed of by sale |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Income from real estate and related assets sold |  |  |  | $ (1) | $ 216 | (44) | $ 441 |
Gain on sale of real estate, net |  |  |  |  |  | $ 10 |  |
Disposed of by sale | Subsequent Event | Maple Heights, Ohio |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Income from real estate and related assets sold |  | 11,400 |  |  |  |  |  |
Gain on sale of real estate, net |  | $ 1,200 |  |  |  |  |  |
Common Stock | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Consideration received |  |  | $ 1,600 |  |  |  |  |
Redeemable preferred stock, shares issued (in shares) | shares |  |  | 85,000 |  |  |  |  |
Series E Preferred Stock | Preferred Stock | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Consideration received |  |  | $ 1,500 |  |  |  |  |
Redeemable preferred stock, shares issued (in shares) | shares |  |  | 67,249 |  |  |  |  |

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