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Summary of Significant Accounting Policies - Summary of Distributions Per Share and in Total (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounting Policies [Abstract]      
Distributions per Share $ 0.15 $ 0.15 $ 0.43
Distributions paid $ 250,082 $ 235,745 $ 753,725