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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]      
Provision for income taxes $ 2,951,000 $ 1,606,000 $ 4,127,000
Effective income tax rate (7.50%) (2.00%) 76.80%
Effective income tax rate, exclusive of discrete items (9.60%) (2.80%) 79.20%
Discrete tax benefit (expenses) $ 900,000    
Net deferred tax liabilities 993,000 $ 783,000  
Income taxes on accumulated foreign subsidiary earnings, foreign cash and certain other net current assets   15.50%  
Income taxes on accumulated foreign subsidiary earnings, remaining earnings   8.00%  
Provisional amount of one-time transitional tax liability for foreign subsidiaries   $ 35,100,000  
Transition tax expense 1,100,000    
AMT credit carryforwards (400,000)    
De-recognized UTP 400,000 1,100,000  
Recognized UTP 600,000 100,000 $ 100,000
Interest expense relating to UTPs 100,000 0 $ 100,000
Valuation allowance 84,100,000 $ 89,700,000  
Valuation allowance decrease 5,600,000    
U.S. Federal net operating loss carryforwards 140,100,000.0    
State Of California      
Income Taxes [Line Items]      
State operating loss carryforwards 189,900,000    
Foreign Tax Authority      
Income Taxes [Line Items]      
Foreign tax credit carryforwards 100,000    
Internal Revenue Service (IRS) | Research Tax Credit Carryforward      
Income Taxes [Line Items]      
Research and development tax credit carryforwards 500,000    
State and Local Jurisdiction | Research Tax Credit Carryforward      
Income Taxes [Line Items]      
Research and development tax credit carryforwards $ 100,000