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Income Taxes - Schedule of Income Tax Expense (Benefit) (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Current:    
Federal $ (2,466,482) $ 789,150
State 289,563 264,707
Current Income Tax Expense (2,176,919) 1,053,857
Deferred:    
Federal (47,531,436) 2,172,740
State 1,480,065 5,071,205
Deferred Income Tax Expense (46,051,371) 7,243,945
Income Tax Expense (Benefit) $ (48,228,290) $ 8,297,802