XML 100 R88.htm IDEA: XBRL DOCUMENT v3.7.0.1
Income Taxes - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Tax Credit Carryforward [Line Items]        
Change in valuation allowance $ 1,792 $ 2,253 $ 515  
Income tax holiday description Profits generated from certain products of SMI Taiwan are exempted from income tax for five years beginning January 1, 2012.      
Tax holidays, tax savings amount $ 4,648 $ 906 $ 2,573  
Tax holidays, per share effect on earnings $ 0.03 $ 0.01 $ 0.02  
Accumulated undistributed earnings from a foreign subsidiary $ 297,000      
Deferred tax liability on undistributed foreign earnings 0      
Unrecognized tax benefit 10,286 $ 5,639 $ 4,655 $ 5,815
Total amount of interest expense and penalties 575 363 $ 343  
Total amount of accrued interest and penalties 2,587 $ 1,977    
Federal        
Tax Credit Carryforward [Line Items]        
Net operating loss carryforwards for income tax purposes $ 12,334      
Federal net operating loss carryforwards expiration year 2036      
Research And Development | Federal        
Tax Credit Carryforward [Line Items]        
Deferred tax assets tax credit carryforwards $ 2,486      
Tax credit carryforward expiration year for federal 2036      
Research And Development | State        
Tax Credit Carryforward [Line Items]        
Deferred tax assets tax credit carryforwards $ 1,742      
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 $ 4,418      
FCI | Research And Development | Minimum        
Tax Credit Carryforward [Line Items]        
Tax credit carryforward expiration year for federal 2017      
FCI | Research And Development | Maximum        
Tax Credit Carryforward [Line Items]        
Tax credit carryforward expiration year for federal 2021