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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Line Items]      
Amount expected to be utilized of tax credit carry forwards expiring in the and beyond the stated year $ 700    
Valuation allowance 24,132 $ 21,618  
Unrecognized tax benefits, impact on effective tax rate 9,800 9,300 $ 8,300
Accrued interest and penalties 500 500 $ 300
Increase (decrease) in income tax expense 100 $ 200  
Foreign Countries      
Income Taxes [Line Items]      
Valuation allowance 22,600    
California Enterprise Zone      
Income Taxes [Line Items]      
Valuation allowance 1,500    
Foreign Countries      
Income Taxes [Line Items]      
Net operating loss carryforwards, foreign 27,600    
California enterprise zone      
Income Taxes [Line Items]      
California enterprise zone tax credits $ 2,200