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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Tax Credit Carryforward [Line Items]          
Change in valuation allowance   $ 2,708 $ (1,933)    
Accumulated undistributed earnings from a foreign subsidiary $ 370,000 370,000      
Deferred tax liability on undistributed foreign earnings 0 0      
Unrecognized tax benefit 19,001 19,001 20,655 $ 18,707 $ 15,056
Total amount of interest expense and penalties   430 319 $ 776  
Total amount of accrued interest and penalties 5,179 $ 5,179 $ 4,511    
Cayman Islands Tax Information Authority [Member]          
Tax Credit Carryforward [Line Items]          
Corporate income tax rate   0.00% 0.00% 0.00%  
Foreign Tax Authority | Internal Revenue Service (IRS) [Member] | Tax Year 2017 [Member]          
Tax Credit Carryforward [Line Items]          
Net operating loss carryforwards for income tax purposes 36,823 $ 36,823      
Foreign Tax Authority | Internal Revenue Service (IRS) [Member] | Tax Year 2018 [Member]          
Tax Credit Carryforward [Line Items]          
Net operating loss carryforwards for income tax purposes $ 12,244 $ 12,244      
Operating loss carryforward expiration year description carryforward indefinitely        
Foreign Tax Authority | Maximum | Internal Revenue Service (IRS) [Member] | Tax Year 2017 [Member]          
Tax Credit Carryforward [Line Items]          
Federal net operating loss carryforwards expiration year   2037      
Foreign Tax Authority | Research And Development | Internal Revenue Service (IRS) [Member]          
Tax Credit Carryforward [Line Items]          
Deferred tax assets tax credit carryforwards $ 2,659 $ 2,659      
Tax credit carryforward expiration year for federal   2040      
State and Local Jurisdiction [Member] | Minimum | Internal Revenue Service (IRS) [Member] | Tax Year 2017 [Member]          
Tax Credit Carryforward [Line Items]          
Federal net operating loss carryforwards expiration year   2021      
State and Local Jurisdiction [Member] | Research And Development          
Tax Credit Carryforward [Line Items]          
Deferred tax assets tax credit carryforwards $ 1,853 $ 1,853      
Tax credit carryforward expiration year for state   no expiration date in California