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Income Taxes - Components of Income Tax (Benefit) Provision (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
State $ 149,410 $ 239,582 $ 191,332
Total 149,410 239,582 191,332
Deferred:      
Federal 351,663 1,661,153 (1,294,408)
State (31,724) (162,931) (264,558)
Total 319,939 1,498,222 (1,558,966)
Income tax (benefit) provision $ 469,349 $ 1,737,804 $ (1,367,634)