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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Line Items]            
Tax cuts and jobs act, incomplete accounting, estimated income tax expense   $ 11,900,000        
Tax cuts and jobs act, incomplete accounting, estimated write-down of deferred tax assets   9,200,000        
Tax cuts and jobs act, incomplete accounting, change in tax rate estimate income tax expense related to unrepatriated foreign earnings   2,700,000        
Tax cuts and jobs act, complete accounting, income tax expense (benefit) $ (4,000,000.0)          
Deferred tax benefit recorded as an adjustment to other comprehensive income     $ 2,800,000 $ 1,700,000    
Foreign losses   3,091,000 3,097,000 3,091,000    
State losses and credit carry-forwards   3,854,000 8,164,000 3,854,000    
Federal loss and research carry-forwards   3,058,000 17,495,000 3,058,000    
Foreign and domestic carry-forwards, research and development tax credits, unamortized research and development cost and state credit carry-forwards     28,800,000      
Net change in valuation allowance     (200,000)      
Cash and cash equivalents   86,433,000 105,504,000 86,433,000    
Short-term investments   16,129,000 3,246,000 16,129,000    
Short-term liquidity amount   102,600,000 108,700,000 102,600,000    
Income tax benefit (expense) from stock options exercised adjustment to equity     0 0 $ 0  
Unrecognized tax benefits   2,366,000 1,868,000 2,366,000 2,226,000 $ 2,537,000
Unrecognized tax benefits, effective tax rate   2,200,000 1,700,000 2,200,000 1,700,000  
Accrued interest and penalties   800,000 700,000 800,000 $ 800,000  
Foreign Subsidiaries [Member]            
Income Tax Disclosure [Line Items]            
Short-term liquidity amount   $ 56,800,000 $ 87,100,000 $ 56,800,000    
Short-term liquidity, in percentage   55.40% 80.10% 55.40%    
Minimum [Member]            
Income Tax Disclosure [Line Items]            
Operating loss carry forwards expiration year     2019      
Maximum [Member]            
Income Tax Disclosure [Line Items]            
Operating loss carry forwards expiration year     2030      
Foreign [Member]            
Income Tax Disclosure [Line Items]            
Valuation allowance established against loss carryforwards     $ 2,400,000      
State [Member]            
Income Tax Disclosure [Line Items]            
Valuation allowance established against loss and credit carryforwards     $ 3,400,000