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Financial Instruments - Financial instruments measured at fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Financial Assets at Fair Value Through Profit or Loss    
Money market fund $ 2,117 $ 0
Equity securities-unlisted company 21,650 15,350
Subtotal 23,767 15,350
Financial assets at fair value through others comprehensive income    
Equity securities-listed company 1,128  
Equity securities-unlisted company 507 279
Total 25,402 15,629
Level 1    
Financial Assets at Fair Value Through Profit or Loss    
Money market fund 2,117  
Equity securities-unlisted company   0
Subtotal 2,117 0
Financial assets at fair value through others comprehensive income    
Equity securities-listed company 1,128  
Equity securities-unlisted company   0
Total 3,245 0
Level 2    
Financial Assets at Fair Value Through Profit or Loss    
Equity securities-unlisted company   0
Subtotal   0
Financial assets at fair value through others comprehensive income    
Equity securities-unlisted company   0
Total   0
Level 3    
Financial Assets at Fair Value Through Profit or Loss    
Equity securities-unlisted company 21,650 15,350
Subtotal 21,650 15,350
Financial assets at fair value through others comprehensive income    
Equity securities-unlisted company 507 279
Total $ 22,157 $ 15,629