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Details of Significant Accounts - Share-based payment, shareholder earnout - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Service agreements with Board of Directors      
Share-based payment arrangements      
Expenses recorded $ 0 $ 58 $ 0
Shareholder Earnout Shares      
Share-based payment arrangements      
Threshold trading days over which the daily volume-weighted average price of the perfect class A ordinary shares is considered 20 days    
Threshold trading day period over which the daily volume-weighted average price of the perfect class A ordinary shares is considered 30 days    
Shareholder Earnout Shares | If daily volume-weighted average price of the Perfect Class A Ordinary Shares is greater than or equal to $11.50      
Share-based payment arrangements      
Number of earnout shares issuable (in shares) 3,000    
Daily volume-weighted average price of the perfect class A ordinary shares considered (in USD per share) $ 11.50    
Shareholder Earnout Shares | If daily volume-weighted average price of the Perfect Class A Ordinary Shares is greater than or equal to $13.00      
Share-based payment arrangements      
Number of earnout shares issuable (in shares) 3,000    
Daily volume-weighted average price of the perfect class A ordinary shares considered (in USD per share) $ 13.00    
Shareholder Earnout Shares | If daily volume-weighted average price of the Perfect Class A Ordinary Shares is greater than or equal to $14.50      
Share-based payment arrangements      
Number of earnout shares issuable (in shares) 4,000    
Daily volume-weighted average price of the perfect class A ordinary shares considered (in USD per share) $ 14.50