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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounting Policies [Line Items]          
Dividend payable, amount per share $ 0.04562 $ 0.04562   $ 0.04562  
Dividend payable, date to be paid Jul. 08, 2019        
Dividends Payable, date of record Jul. 02, 2019        
Distributions Paid $ 79,835 $ 246,634 $ 114,058 $ 503,643 $ 174,748
Provision for federal income taxes       $ 0  
Minimum days required to stay for tax liability       183 days  
Sponsor | Professional Fees Liability          
Accounting Policies [Line Items]          
Legal fees and expenses assumed       $ 100,000  
Excess amount of assumed audit fees and legal expenses       $ 100,000  
Audit fees and legal expenses   $ 0     $ 0