Related Person Transactions (Details) - Affiliated Entity - $ / shares			12 Months Ended
	Oct. 01, 2021	Jan. 05, 2021	Dec. 31, 2021
Management Services | Tremont Realty Advisors Llc
Related Party Transaction [Line Items]
Shares owned (in shares)			825,651
Percent of outstanding common shares			5.70%
Investment Advisory Services | RMR Advisors
Related Party Transaction [Line Items]
Related party, rate		0.85%
Share Awards | Officers and Employees
Related Party Transaction [Line Items]
Awards granted (in shares)			83,000
Awards granted (in dollars per share)	$ 10.41
Share Awards | Share-based Payment Arrangement, Tranche One | Officers and Employees
Related Party Transaction [Line Items]
Vesting percentage of awards granted			20.00%
Share Awards | Share-based Payment Arrangement, Tranche Two | Officers and Employees
Related Party Transaction [Line Items]
Vesting percentage of awards granted			20.00%
Share Awards | Share-based Payment Arrangement, Tranche Three | Officers and Employees
Related Party Transaction [Line Items]
Vesting percentage of awards granted			20.00%
Share Awards | Share-Based Compensation Award, Tranche Four | Officers and Employees
Related Party Transaction [Line Items]
Vesting percentage of awards granted			20.00%
Share Awards | Share-Based Compensation Award, Tranche Five | Officers and Employees
Related Party Transaction [Line Items]
Vesting percentage of awards granted			20.00%