Number of persons employed by the Entity

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Represents the service agreements entered into by the entity for availing services from other entities.

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- Definition

Related Party Property Management And Construction Management Fee And Construction Supervision

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Total expense amount to reimburse a related party.

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Represents the business management fees incurred pursuant to business management agreement with related parties.

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Related Party Transaction, Estimated Incentive Fee Calculation Period

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of transactions with related party during the financial reporting period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
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-Paragraph 1
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-Section 50
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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

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Business and Property Management Agreements with RMR LLC (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 22, 2021	Sep. 30, 2021 USD ($) employee agreement	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) employee agreement	Sep. 30, 2020 USD ($)
Real Estate Properties [Line Items]
Number of employees \| employee		0		0
RMR LLC
Real Estate Properties [Line Items]
Number of management service agreements \| agreement		2		2
Business management fees incurred		$ 10,794	$ 8,641
Incentive fee calculation period				3 years
Related party property management and construction management fee		1,384	781
Related party reimbursement expenses		679	258
RMR LLC \| Amended and restate business management agreement
Real Estate Properties [Line Items]
Business management fees incurred				$ 31,836	$ 27,613
Related party property management and construction management fee				3,267	2,722
Related party reimbursement expenses				2,016	525
RMR LLC \| Property Management Fees
Real Estate Properties [Line Items]
Related party expenses		1,002	$ 781	2,683	2,710
Related party, percentage fee	3.00%
RMR LLC \| Construction and Supervision Fees Capitalized
Real Estate Properties [Line Items]
Related party transaction amount		$ 382		$ 584	$ 12