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Financial Instruments - Financial instruments measured at fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Financial Assets at Fair Value Through Profit or Loss    
Money market fund   $ 2,345
Equity securities-unlisted company $ 15,350 13,668
Subtotal 15,350 16,013
Financial assets at fair value through others comprehensive income    
Equity securities-unlisted company 279 410
Total 15,629 16,423
Level 1    
Financial Assets at Fair Value Through Profit or Loss    
Money market fund   2,345
Equity securities-unlisted company   0
Subtotal   2,345
Financial assets at fair value through others comprehensive income    
Equity securities-unlisted company   0
Total   2,345
Level 2    
Financial Assets at Fair Value Through Profit or Loss    
Money market fund   0
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    
Money market fund   0
Equity securities-unlisted company 15,350 13,668
Subtotal 15,350 13,668
Financial assets at fair value through others comprehensive income    
Equity securities-unlisted company 279 410
Total $ 15,629 $ 14,078