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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Deferred tax assets, net operating loss carryforwards $ 1,206,000 $ 1,240,000
Benefit of net operating loss carryforwards 5,400,000  
Unrecognized tax benefit that would affect the effective tax rate 2,800,000  
Uncertain tax positions, interest expense and penalties accrued 500,000  
Minimum    
Income Taxes [Line Items]    
Decrease in unrecognized tax benefits, net of penalties and interest 0  
Maximum    
Income Taxes [Line Items]    
Decrease in unrecognized tax benefits, net of penalties and interest $ 4,800,000