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Financial Instruments - Financial instruments measured at fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financial assets measured at fair value through profit or loss    
Money market fund $ 2,345 $ 7,799
Equity securities-unlisted company 13,668 13,966
Subtotal 16,013 21,765
Financial assets measured at fair value through other comprehensive income    
Equity securities-unlisted company 410 742
Total 16,423 22,507
Level 1 [Member]    
Financial assets measured at fair value through profit or loss    
Money market fund 2,345 7,799
Equity securities-unlisted company   0
Subtotal 2,345 7,799
Financial assets measured at fair value through other comprehensive income    
Equity securities-unlisted company   0
Total 2,345 7,799
Level 2 [Member]    
Financial assets measured at fair value through profit or loss    
Money market fund   0
Equity securities-unlisted company   0
Subtotal   0
Financial assets measured at fair value through other comprehensive income    
Equity securities-unlisted company   0
Total   0
Level 3 [member]    
Financial assets measured at fair value through profit or loss    
Money market fund   0
Equity securities-unlisted company 13,668 13,966
Subtotal 13,668 13,966
Financial assets measured at fair value through other comprehensive income    
Equity securities-unlisted company 410 742
Total $ 14,078 $ 14,708