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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Tax Credit Carryforward [Line Items]      
Change in valuation allowance $ 2,253 $ 515 $ 1,075
Income tax holiday description Profits generated from certain products of SMI Taiwan are exempted from income tax for five years beginning January 1, 2010 and January 1, 2012.    
Accumulated undistributed earnings from a foreign subsidiary $ 242,000    
Deferred tax liability 0    
Unrecognized tax benefits that would affect effective tax rate 5,639    
Total amount of interest expense and penalties 363 343 $ 627
Total amount of accrued interest and penalties 1,977 $ 1,674  
Federal      
Tax Credit Carryforward [Line Items]      
Net operating loss carryforwards for income tax purposes $ 9,427    
Federal net operating loss carryforwards expiration year 2035    
Research And Development | Federal      
Tax Credit Carryforward [Line Items]      
Deferred tax assets tax credit carryforwards $ 2,444    
Tax credit carryforward expiration year for federal 2035    
Research And Development | State      
Tax Credit Carryforward [Line Items]      
Deferred tax assets tax credit carryforwards $ 1,711    
Tax credit carryforward expiration year for state No expiration date    
Taiwan      
Tax Credit Carryforward [Line Items]      
Income tax exemption term 5 years    
FCI | Research And Development      
Tax Credit Carryforward [Line Items]      
Deferred tax assets tax credit carryforwards $ 4,139    
FCI | Research And Development | Minimum      
Tax Credit Carryforward [Line Items]      
Tax credit carryforward expiration year for federal 2015    
FCI | Research And Development | Maximum      
Tax Credit Carryforward [Line Items]      
Tax credit carryforward expiration year for federal 2019