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Summary of Significant Accounting Policies - Summary of Distributions Per Share and in Total (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounting Policies [Abstract]        
Distributions per Share $ 0.15 $ 0.05 $ 0.28 $ 0.08
Distributions paid $ 246,634 $ 111,058 $ 503,643 $ 174,748