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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 Taxes [Line Items]        
Deferred tax assets, net operating loss carryforwards   $ 2,623,000 $ 2,921,000  
Benefit of net operating loss carryforwards   10,600,000    
Unrecognized tax benefit that would affect the effective tax rate   1,500,000    
Uncertain tax positions, interest expense and penalties accrued   $ 100,000    
Federal corporate tax rate   35.00% 35.00% 35.00%
Decrease in total income tax expense (benefit), due to tax rate change   $ (3,386,000)    
Tax benefit recognized, due to tax rate change   3,800,000    
Tax expense offset amount   400,000    
Scenario, Forecast [Member]        
Income Taxes [Line Items]        
Federal corporate tax rate 21.00%      
Minimum [Member]        
Income Taxes [Line Items]        
Decrease in unrecognized tax benefits, net of penalties and interest   0    
Maximum [Member]        
Income Taxes [Line Items]        
Decrease in unrecognized tax benefits, net of penalties and interest   $ 1,100,000