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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]        
Provision (benefit) for income taxes   $ 1,606,000 $ 4,127,000 $ 3,423,000
Effective income tax rate   (2.00%) 76.80% 12.90%
Effective income tax rate, exclusive of discrete items   (2.80%) 79.20% 9.50%
Discrete tax benefit (expenses)   $ 100,000    
Net deferred tax liabilities   $ 783,000 $ 2,034,000  
U.S. statutory tax rate   35.00% 35.00% 35.00%
Provisional amount included as a component of income tax expense   $ 34,300,000    
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    
AMT credit carryforwards   800,000    
Recognized UTP   66,300 $ 49,700 $ 1,800,000
Interest expense relating to UTPs   0 67,900  
Valuation allowance   89,700,000 49,300,000  
Valuation allowance     $ 40,400,000  
U.S. Federal net operating loss carryforwards   0    
Hong Kong        
Income Taxes [Line Items]        
De-recognized UTP   1,100,000    
Scenario Plan [Member]        
Income Taxes [Line Items]        
U.S. statutory tax rate 21.00%      
State Of California        
Income Taxes [Line Items]        
State operating loss carryforwards   $ 164,400,000    
Net operating loss carryforwards, expiration period   Dec. 31, 2031    
Foreign Tax Authority [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards, expiration period   Dec. 31, 2022    
Foreign tax credit carryforwards   $ 34,100,000    
Internal Revenue Service (IRS) [Member] | Research Tax Credit Carryforward [Member]        
Income Taxes [Line Items]        
Net operating loss carryforwards, expiration period   Dec. 31, 2029    
Research and development tax credit carryforwards   $ 200,000    
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member]        
Income Taxes [Line Items]        
Research and development tax credit carryforwards   $ 100,000