Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
property
Mar. 31, 2021
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2021
USD ($)
Disaggregation of Revenue [Line Items]        
Initial term of unconsolidated real estate venture agreements 4 years      
Performance obligation period of recognition 4 years      
Unconsolidated real estate ventures | property 1,061      
Tenant Insurance and Tenant Warranty Protection Plan Revenues        
Disaggregation of Revenue [Line Items]        
Revenue $ 4,900,000 $ 3,100,000    
Retail Products and Supplies        
Disaggregation of Revenue [Line Items]        
Revenue 600,000 500,000    
Property Management, Call Center, and Platform Fees        
Disaggregation of Revenue [Line Items]        
Revenue $ 3,800,000 3,500,000    
Property management fees as percent of monthly gross revenues and net sales revenue of unconsolidated real estate venture assets 6.00%      
Platform fees per unconsolidated real estate venture property per month $ 1,250      
Call center fees as percent of monthly gross revenues and net sales revenue of unconsolidated real estate venture assets 1.00%      
Acquisition Fees        
Disaggregation of Revenue [Line Items]        
Revenue $ 200,000 200,000    
Acquisition fee     $ 4,000,000  
Deferred revenue related to acquisition fees 300,000     $ 500,000
Tenant Warranty Protection or Tenant Insurance        
Disaggregation of Revenue [Line Items]        
Revenue $ 2,400,000 $ 1,900,000    
Unconsolidated real estate ventures | property 1      
Percent of total warranty protection plan proceeds received per unconsolidated real estate venture property 50.00%