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Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
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Oct. 13, 2022 USD ($) $ / shares | Sep. 14, 2022 $ / shares shares | Aug. 18, 2022 USD ($) | Jun. 02, 2022 trustee $ / shares shares | May 19, 2022 USD ($) | Feb. 17, 2022 USD ($) | Sep. 30, 2022 $ / shares shares | Mar. 31, 2022 shares | Sep. 30, 2021 shares | Jun. 30, 2021 shares | Sep. 30, 2022 USD ($) $ / shares shares | Sep. 30, 2021 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Distributions to shareholders | $ |  |  | $ 2,391 |  | $ 2,390 | $ 2,390 |  |  |  |  | $ 7,171 | $ 7,150
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Distributions to common shareholders declared (in dollars per share) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
Distributions to shareholders | $ | $ 2,397 |  |  |  |  |  |  |  |  |  |  |
Common Shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Number of shares (in shares) | shares |  |  |  |  |  |  | 122,403 | 1,698 | 94,937 | 13,906 |  |
Trustee | Share Award Plans | RMR |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Number Of Trustees | trustee |  |  |  | 7 |  |  |  |  |  |  |  |
Common shares awarded (in shares) | shares |  |  |  | 20,000 |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  | $ 2.14 |  |  |  |  |  |  |  |
Officers And Employees | RMR |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Weighted average share price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 1.30 |  |  |  | $ 1.33 |
Officers And Employees | RMR | Common Shares |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Number of shares (in shares) | shares |  |  |  |  |  |  | 122,403 |  |  |  | 124,101 |
Officers And Employees | Share Award Plans | RMR |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |  |  |
Common shares awarded (in shares) | shares |  | 707,000 |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  | $ 1.30 |  |  |  |  |  |  |  |  |  |

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