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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Line Items]        
Income tax benefit, result of CARES act of 2020 $ 10,800,000      
Valuation allowance established against deferred tax assets 7,900,000      
Tax rate differential on carrying back losses amount $ 2,900,000      
US corporate tax rate 35.00%      
Federal tax rate 21.00% 21.00% 21.00%  
Deferred tax benefit recorded as an adjustment to other comprehensive income $ 100,000 $ 400,000    
Deferred tax assets, gross 55,687,000 56,177,000    
Valuation allowance established against deferred tax assets 45,818,000 48,616,000    
Deferred tax assets tax credit carryforward net operating loss and research and development 2,000,000.0      
Decrease in valuation allowance 2,800,000      
Deferred tax assets tax credit carryforward claims related to CARES Act 7,900,000      
Net of deferred tax liabilities 9,869,000 7,561,000    
Foreign and domestic loss carry-forwards, research and development tax credits, unamortized research and development cost and state credit carry-forwards $ 37,300,000 41,300,000    
Operating loss carry forwards expiration year 2029      
Deferred tax assets $ 21,625,000 20,101,000    
Cash and cash equivalents 60,161,000 73,773,000    
Short-term investments (includes $1,731 and $5,201 of available-for-sale securities as of December 31, 2020 and 2019, respectively, reported at fair value) 3,131,000 33,243,000    
Short-term liquidity amount 63,300,000 107,000,000.0    
Withholding tax liabilities in jurisdiction 700,000      
Income tax benefit (expense) from stock options exercised adjustment to equity 0 0 $ 0  
Unrecognized tax benefits 1,078,000 1,487,000 1,868,000 $ 2,366,000
Unrecognized tax benefits, effective tax rate 1,000,000.0 1,400,000 1,700,000  
Accrued interest and penalties 300,000 500,000 $ 700,000  
Foreign Subsidiaries [Member]        
Income Tax Disclosure [Line Items]        
Short-term liquidity amount $ 49,700,000 $ 52,300,000    
Short-term liquidity, in percentage 78.50% 48.90%    
Operating Losses Expiration Between 2020 and 2039 [Member]        
Income Tax Disclosure [Line Items]        
Deferred tax assets $ 25,100,000      
Minimum [Member]        
Income Tax Disclosure [Line Items]        
Operating loss carry forwards expiration year 2021      
Maximum [Member]        
Income Tax Disclosure [Line Items]        
Operating loss carry forwards expiration year 2040      
Domestic [Member]        
Income Tax Disclosure [Line Items]        
Deferred tax assets, gross $ 43,791,000 $ 46,266,000    
Valuation allowance established against deferred tax assets 43,791,000 $ 46,266,000    
Current valuation allowance established against deferred tax assets $ 43,800,000