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Details of Significant Accounts - Income tax, schedule of statutory tax rates for significant jurisdictions (Details)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
United States      
Disclosure of temporary difference, unused tax losses and unused tax credits      
Statutory tax rate 21.00% 21.00% 21.00%
State, Statutory tax rate 8.84% 8.84% 8.84%
Japan      
Disclosure of temporary difference, unused tax losses and unused tax credits      
Statutory tax rate 34.60% 35.73% 34.45%
Taiwan      
Disclosure of temporary difference, unused tax losses and unused tax credits      
Statutory tax rate 20.00% 20.00% 20.00%