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Profit Before Income Tax - Additional Information (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Analysis of income and expense [Line Items]        
Percentage of employees' compensation 0.19% 0.19% 0.20% 0.20%
Percentage of remuneration to directors 0.30% 0.30% 0.40% 0.40%
Difference Between Employee Compensation Benefits And Director Remuneration Adjusted In Net Profit $ 818 $ 29 $ 3 $ 29
Bottom of range [member]        
Analysis of income and expense [Line Items]        
Percentage of employees' compensation 0.01% 0.01%    
Top of range [member]        
Analysis of income and expense [Line Items]        
Percentage of employees' compensation 1.00% 1.00%    
Percentage of remuneration to directors 0.75% 0.75%