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Retirement Plan (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit And Contribution Plan Disclosure [Line Items]        
Description Of Maximum Retirement Benefit   The maximum retirement benefit is 45 months of salary    
Description Of Contribution To Pension Fund   The Company contributes an amount equal to 2% of wages and salaries paid every month to the Fund    
Defined Contribution Plan, Percentage Of Contribution, Description   the Company is required to make a monthly contribution for full-time employees in the ROC that elected to participate in the Defined Contribution Plan at a rate no less than 6% of the employees monthly wages to the employees individual pension fund accounts at the ROC Bureau of Labor Insurance    
Defined Contribution Plan, Cost Recognized   $ 2,827 $ 2,455 $ 2,304
Defined Benefit Plan, Accumulated Benefit Obligation   1,332 1,211  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax   1,905 1,906 1,128
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months   16    
Defined Benefit Plan, Expected Future Benefit Payments, Year Two   95    
Defined Benefit Plan, Expected Future Benefit Payments, Year Three   22    
Defined Benefit Plan, Expected Future Benefit Payments, Year Four   35    
Defined Benefit Plan, Expected Future Benefit Payments, Year Five   14    
Defined Benefit Plan, Expected Future Benefit Payments, Six Fiscal Years Thereafter   1,241    
Scenario, Forecast [Member]        
Defined Benefit And Contribution Plan Disclosure [Line Items]        
Defined Benefit Plan, Amortization of Net Gains (Losses) $ 100      
Scenario, Forecast [Member] | Bank of taiwan [Member]        
Defined Benefit And Contribution Plan Disclosure [Line Items]        
Pension Contributions 125      
Employee Social Security Plan [Member]        
Defined Benefit And Contribution Plan Disclosure [Line Items]        
Defined Contribution Plan, Cost Recognized   $ 1,371 $ 1,445 $ 1,012
ROC Bureau Of Labor Insurance [Member] | Scenario, Forecast [Member]        
Defined Benefit And Contribution Plan Disclosure [Line Items]        
Pension Contributions $ 3,400