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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Line Items]        
Statutory corporate tax rate   35.00% 35.00% 35.00%
Provisional tax expense due to remeasurement of federal net deferred tax assets   $ 1,100,000    
Tax cuts and jobs act of 2017, accounting complete   false    
Unrecognized tax benefits   $ 0 $ 0 $ 0
State [Member]        
Income Tax Disclosure [Line Items]        
Net operating loss carry forwards   $ 39,700,000    
Net operating loss carry forwards expiration date   Dec. 31, 2025    
Federal General Business Tax Credit Carry Forward [Member]        
Income Tax Disclosure [Line Items]        
Tax credit carry forwards   $ 0    
Alternative Minimum Tax Credit Carry Forward [Member]        
Income Tax Disclosure [Line Items]        
Tax credit carry forwards   $ 1,800,000    
Scenario Forecast [Member]        
Income Tax Disclosure [Line Items]        
Statutory corporate tax rate 21.00%