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Details of Significant Accounts - Share capital - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 29, 2023
shares
Nov. 24, 2023
shares
Dec. 31, 2023
USD ($)
Vote
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Share capital          
Authorized capital | $     $ 82,000 $ 82,000 $ 82,000
Number of shares authorized (in shares)         820,000,000
Shares reserved for employee stock options (in shares)     30,000,000 30,000,000 45,000,000
Capital stock | $     $ 10,192 $ 11,826 $ 30,152
Number of shares of ordinary stock (in shares)         301,521,000
Shares retired (in shares)     16,320,000    
Number of shares surrendered by shareholder (in shares)     27,000    
Ordinary shares (in USD per share) | $ / shares       $ 0.1 $ 0.1
Number of class B ordinary share convertible into class A ordinary share     1    
Perfect Class A Ordinary Shares          
Share capital          
Number of shares authorized (in shares)     700,000,000 700,000,000  
Capital stock | $     $ 8,513 $ 10,147  
Number of shares of ordinary stock (in shares)     85,128,000 101,475,000  
Shares retired (in shares)   16,129,010 (16,347,000)    
Number of shares surrendered by shareholder (in shares) 27,000        
Ordinary shares (in USD per share) | $ / shares     $ 0.1 $ 0.1  
Number of votes per share | Vote     1    
Perfect Class B Ordinary Shares          
Share capital          
Number of shares authorized (in shares)     90,000,000 90,000,000  
Capital stock | $     $ 1,679 $ 1,679  
Number of shares of ordinary stock (in shares)     16,789,000 16,789,000  
Shares retired (in shares)     0    
Ordinary shares (in USD per share) | $ / shares     $ 0.1 $ 0.1  
Number of votes per share | Vote     10