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Summary of Significant Accounting Policies - Schedule of Dividends Distributions Per Share (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accounting Policies [Abstract]        
Distributions per Share $ 0.05 $ 0.21 $ 0.38 $ 0.55
Distributions paid $ 78,415 $ 363,196 $ 561,201 $ 925,019