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Restricted Unit Awards - Additional Information (Details) - Restricted Unit Awards [Member] - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vested unvested restricted units awards           154,386
Unrecognized compensation expense related to non-vested RUAs granted   $ 1,300,000   $ 1,300,000    
Remaining compensation expense expected to be recognized over a weighted-average period       1 year    
Intrinsic value of unvested RUAs       $ 2,400,000    
General and Administrative Expenses [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Compensation expense   $ 571,000 $ 300,000 $ 840,000 $ 635,000  
Greystone Manager [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vested unvested restricted units awards 50,000          
Greystone Manager [Member] | Maximum [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Approved grant of restricted units and other awards to employees   3,000,000.0   3,000,000.0    
RUAs granted with vesting range       3 years    
Greystone Manager [Member] | Minimum [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
RUAs granted with vesting range       3 months