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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]      
Deferred tax assets, net operating loss carryforwards $ 1,446,000 $ 2,623,000  
Benefit of net operating loss carryforwards 5,900,000    
Unrecognized tax benefit that would affect the effective tax rate 2,700,000    
Uncertain tax positions, interest expense and penalties accrued $ 300,000    
Federal corporate tax rate 21.00% 35.00% 35.00%
Decrease in total income tax expense (benefit), due to tax rate change $ (810,000) $ (3,386,000)  
Tax benefit recognized, due to tax rate change 800,000 $ 3,800,000  
Tax expense offset amount 400,000    
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 $ 1,500,000