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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
property
Dec. 31, 2020
USD ($)
property
tenant
Dec. 31, 2019
USD ($)
property
tenant
Dec. 22, 2019
USD ($)
Product Information [Line Items]        
Number of properties provided rent deferral (as a percent) | property   12    
Number of properties provided rent abatement (as a percent) | property   15    
Collection of rents due (as a percent)   100.00%    
Depreciation and amortization $ 195,000 $ 15,459,000   $ 10,422,000
Depreciation 100,000 10,700,000   8,400,000
Amortization $ 100,000 $ 4,800,000   2,000,000.0
Number of real estate properties held for sale | property 2 3 2  
Restricted cash   $ 14,800,000    
Readiness expenses $ 0 2,200,000   500,000
Acquisition related expenses $ 100,000 $ 1,000,000.0   $ 100,000
Annual required distribution     $ 200,000  
Number of tenants | tenant   63    
Number of properties leased | property   219 123  
Annualized Base Rent | Customer Concentration Risk | COVID-19, Rent Deferral        
Product Information [Line Items]        
Concentration risk (as a percent)   0.50%    
Annualized Base Rent | Customer Concentration Risk | COVID-19, Rent Abatement        
Product Information [Line Items]        
Concentration risk (as a percent)   1.70%    
Revenue Benchmark | Customer Concentration Risk | CVS        
Product Information [Line Items]        
Concentration risk (as a percent)     12.60%  
Number of tenants | tenant     48