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Lease - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Leased Assets [Line Items]      
Lease Expense $ 4,261 $ 4,775 $ 3,933
Operating Lease Payments 3,226 3,233  
Operating lease right of use assets 6,704 8,603  
Operating lease liabilities accrued current 3,058    
Operating lease liabilitites long term 3,881    
Accounting Standards Update 2016-02 [Member]      
Operating Leased Assets [Line Items]      
Operating lease right of use assets $ 6,704 $ 8,603  
Operating lease weighted average remaining lease term 2 years 10 months 13 days 3 years 6 months  
Operating lease weighted average discount rate 3.56% 3.78%  
Accounting Standards Update 2016-02 [Member] | Other Current Liabilities [Member]      
Operating Leased Assets [Line Items]      
Operating lease liabilities accrued current $ 3,058 $ 3,046  
Accounting Standards Update 2016-02 [Member] | Other Noncurrent Liabilities [Member]      
Operating Leased Assets [Line Items]      
Operating lease liabilitites long term $ 3,881 $ 5,621