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Pension Plan - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Accumulated benefit obligation $ 2,648 $ 2,098 $ 1,762
Estimated amortization of net gain from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year 25    
Taiwan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Contributions and Recognized Pension Costs under Labor Pension Act $ 1,272 $ 1,015 $ 872
Contributions Based on Percentage Employee Salaries under Labor Standards Law 2.00%    
The contribution under defined benefit plans $ 61    
FCI      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
The contribution under defined benefit plans $ 257    
Minimum | Taiwan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Percentage of Contribution by an Employer to Employees Pension 6.00%