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Related Person Transactions (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 22 Months Ended
Jun. 30, 2021
USD ($)
ft²
renewal_option
Sep. 30, 2021
USD ($)
ft²
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
ft²
agreement
Sep. 30, 2020
USD ($)
Mar. 31, 2023
USD ($)
Related Party Transaction [Line Items]            
Rentable Square Feet (in square feet) | ft²   926,000   926,000    
RMR LLC            
Related Party Transaction [Line Items]            
Number of agreements | agreement       2    
Revenue from related party   $ 275 $ 282 $ 850 $ 836  
Sonesta            
Related Party Transaction [Line Items]            
Lessor, operating lease, lease not yet commenced, term of contract 30 years          
Rentable Square Feet (in square feet) | ft² 230,000          
Area of real estate property percentage upon completion of re-development 54.00%          
Number of renewal options | renewal_option 2          
Renewal term 10 years          
Annual base rent $ 6,436          
Deferred payment plan period 18 months          
Annual percentage increase 10.00%          
Annual base rent increase period 5 years          
Sonesta | Forecast            
Related Party Transaction [Line Items]            
Payments to acquire and develop real estate           $ 66,000