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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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   $ 400,000 2,800,000    
Deferred tax assets, gross   56,177,000      
Valuation allowance established against deferred tax assets   48,616,000      
Deferred tax assets, state research and development credits   12,171,000 17,495,000    
Net of deferred tax liabilities   7,561,000 37,187,000    
Foreign and domestic loss carry-forwards, research and development tax credits, unamortized research and development cost and state credit carry-forwards   $ 41,300,000 28,800,000    
Operating loss carry forwards expiration year   2029      
Deferred tax assets   $ 20,101,000 47,233,000    
Cash and cash equivalents   73,773,000 105,504,000    
Short-term investments   33,243,000 3,246,000    
Short-term liquidity amount   107,000,000.0 108,700,000    
Income tax benefit (expense) from stock options exercised adjustment to equity   0 0 $ 0  
Unrecognized tax benefits 2,366,000 1,487,000 1,868,000 2,366,000 $ 2,226,000
Unrecognized tax benefits, effective tax rate 2,200,000 1,400,000 1,700,000 2,200,000  
Accrued interest and penalties $ 800,000 500,000 700,000 $ 800,000  
Foreign Subsidiaries [Member]          
Income Tax Disclosure [Line Items]          
Short-term liquidity amount   $ 52,300,000 $ 87,100,000    
Short-term liquidity, in percentage   48.90% 80.10%    
Operating Losses Expiration Between 2020 and 2039 [Member]          
Income Tax Disclosure [Line Items]          
Deferred tax assets   $ 19,100,000      
Minimum [Member]          
Income Tax Disclosure [Line Items]          
Operating loss carry forwards expiration year   2020      
Maximum [Member]          
Income Tax Disclosure [Line Items]          
Operating loss carry forwards expiration year   2039      
Domestic [Member]          
Income Tax Disclosure [Line Items]          
Deferred tax assets, gross   $ 46,266,000      
Valuation allowance established against deferred tax assets   46,266,000      
Valuation allowance established against deferred tax assets   42,800,000      
State And Foreign Country [Member]          
Income Tax Disclosure [Line Items]          
Deferred tax assets, state research and development credits   $ 5,800,000