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Others - Financial instruments, schedule of significant financial assets and liabilities denominated in foreign currencies (Details)
€ in Thousands, ¥ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
JPY (¥)
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
JPY (¥)
Dec. 31, 2022
CNY (¥)
Financial instruments                    
Currency Amount, Assets $ 161,646 $ 200,811                
Currency Amount, Liabilities 10,406 9,396                
Foreign exchange gains (losses) 34 1,303 $ (893)              
Foreign exchange risk | USD:NTD                    
Financial instruments                    
Currency Amount, Assets   22,660         $ 695,889      
Currency Amount, Liabilities   $ 2,620         $ 80,460      
Exchange rate   30.71         30.71 30.71 30.71 30.71
Degree of Variation, Assets   1.00%                
Degree of Variation, Liabilities   1.00%                
Effect on profit or loss, Assets   $ 227                
Effect on profit or loss, Liabilities   26                
Foreign exchange risk | EUR:NTD                    
Financial instruments                    
Currency Amount, Assets   $ 888         $ 27,256 € 833    
Exchange rate   32.72         32.72 32.72 32.72 32.72
Degree of Variation, Assets   1.00%                
Effect on profit or loss, Assets   $ 9                
Foreign exchange risk | JPY:NTD                    
Financial instruments                    
Currency Amount, Assets   $ 3,271         $ 100,454   ¥ 436,755  
Exchange rate   0.23         0.23 0.23 0.23 0.23
Degree of Variation, Assets   1.00%                
Effect on profit or loss, Assets   $ 33                
Foreign exchange risk | USD:JPY                    
Financial instruments                    
Currency Amount, Liabilities $ 168 $ 221       ¥ 23,754     ¥ 29,203  
Exchange rate 141.39 132.14   141.39 141.39 141.39 132.14 132.14 132.14 132.14
Degree of Variation, Liabilities 1.00% 1.00%                
Effect on profit or loss, Liabilities $ 2 $ 2                
Foreign exchange risk | USD:RMB                    
Financial instruments                    
Currency Amount, Liabilities   $ 65               ¥ 453
Exchange rate   6.97         6.97 6.97 6.97 6.97
Degree of Variation, Liabilities   1.00%                
Effect on profit or loss, Liabilities   $ 1                
Foreign exchange risk | NTD:USD                    
Financial instruments                    
Currency Amount, Assets $ 2,579     $ 79,097            
Exchange rate 0.0326     0.0326 0.0326 0.0326        
Degree of Variation, Assets 1.00%                  
Effect on profit or loss, Assets $ 26                  
Foreign exchange risk | EUR:USD                    
Financial instruments                    
Currency Amount, Assets 735       € 664          
Currency Amount, Liabilities $ 153       € 138          
Exchange rate 1.1064     1.1064 1.1064 1.1064        
Degree of Variation, Assets 1.00%                  
Degree of Variation, Liabilities 1.00%                  
Effect on profit or loss, Assets $ 7                  
Effect on profit or loss, Liabilities 2                  
Foreign exchange risk | JPY:USD                    
Financial instruments                    
Currency Amount, Assets $ 2,252         ¥ 317,217        
Exchange rate 0.0071     0.0071 0.0071 0.0071        
Degree of Variation, Assets 1.00%                  
Effect on profit or loss, Assets $ 23