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Commitment and Contingencies - Additional Information (Details)
1 Months Ended 6 Months Ended
Apr. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Loan
Aug. 08, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items]        
Mortgage notes receivable, net   $ 42,773,000   $ 18,557,000
Number of contruction mortgage loans | Loan   2    
Mountains' Edge Hospital        
Loss Contingencies [Line Items]        
Aggregate amount available for construction and equipping of new surgical suites $ 11,000,000      
Percentage of base rent increased on amount in-place lease rate advanced 9.40%      
Maximum        
Loss Contingencies [Line Items]        
Mortgage notes receivable, net   $ 25,000,000    
Subsequent Event        
Loss Contingencies [Line Items]        
Fund available pursuant to the commitment for construction     $ 15,200,000  
Subsequent Event | Mountains' Edge Hospital        
Loss Contingencies [Line Items]        
Fund available pursuant to the commitment for construction     $ 2,500,000