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Subsequent Events - Subsequent Distributions Paid in Cash (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Subsequent Event [Line Items]      
Distribution Amount $ 384,568 $ 258,470 $ 52,273
Class P Common Stock      
Subsequent Event [Line Items]      
Distribution Amount $ 384,568    
Class P Common Stock | March 2018      
Subsequent Event [Line Items]      
Distribution Period March 2018    
Payment Date Apr. 02, 2018    
Distribution Amount $ 384,568    
Class P Common Stock | April 2018      
Subsequent Event [Line Items]      
Distribution Period April 2018    
Payment Date May 01, 2018    
Distribution Amount $ 411,276