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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income taxes $ 304 $ 244 $ (195)
Percentage of ordinary income 96.60% 89.20% 100.00%
Capital gain distributions percentage 3.40% 10.80% 0.00%
Non-taxable distributions percentage 0.00% 0.00% 0.00%
Percentage of taxable income distributed among stockholders 90.00%