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Details of Significant Accounts - Share capital, share repurchase plan and tender offer- Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 8 Months Ended 12 Months Ended
Feb. 07, 2024
Dec. 29, 2023
Nov. 24, 2023
Oct. 26, 2023
May 04, 2023
Dec. 31, 2023
Dec. 31, 2023
Share capital              
Maximum period authorised for share repurchase             12 months
Shares retired (in shares)             16,320,000
Perfect Class A Ordinary Shares              
Share capital              
Number of treasury shares retired (in shares)   16,129,000   191,000   191,000  
Share repurchase, authorised amount     $ 50,000   $ 20,000    
Number of treasury shares repurchased (in shares)           259,000  
Treasury shares repurchased, amount           $ 1,064  
Shares retired (in shares)     16,129,010       (16,347,000)
Number of treasury shares held (in shares)           68,000 68,000
Share price per share (in USD per share)     $ 3.10        
Stock repurchase program authorized shares (in shares)     16,129,032        
Perfect Class A Ordinary Shares | Major ordinary share transactions              
Share capital              
Number of treasury shares retired (in shares) 68,000