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Restricted Unit Awards - Additional Information (Details) - Restricted Unit Awards [Member] - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2020
Mar. 31, 2021
Mar. 31, 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   $ 334,000    
Remaining compensation expense expected to be recognized over a weighted-average period   1 year 2 months 12 days    
Intrinsic value of unvested RUAs   $ 734,000    
General and Administrative Expenses [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Compensation expense   $ 78,000 $ 39,000  
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    
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