v3.26.1
Income Tax - Summary of Unused Loss Carry-forward (Detail) - Dec. 31, 2025
$ in Thousands, $ in Thousands
TWD ($)
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused loss carry-forward $ 3,705,104 $ 118,110
2026 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused loss carry-forward 264,281 8,425
2027 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused loss carry-forward 345,259 11,006
2028 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused loss carry-forward 235,176 7,497
2029 [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused loss carry-forward 286,443 9,131
2030 and thereafter [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused loss carry-forward $ 2,573,945 $ 82,051