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Financial Instruments - Financial instruments measured at fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financial assets measured at fair value through profit or loss    
Money market fund $ 7,799  
Equity securities-unlisted company 13,966 $ 13,500
Subtotal 21,765 13,500
Financial assets measured at fair value through other comprehensive income    
Equity securities-unlisted company 742 709
Total 22,507 14,209
Level 1 [Member]    
Financial assets measured at fair value through profit or loss    
Money market fund 7,799  
Equity securities-unlisted company 0 0
Subtotal 7,799 0
Financial assets measured at fair value through other comprehensive income    
Equity securities-unlisted company 0 0
Total 7,799 0
Level 2 [Member]    
Financial assets measured at fair value through profit or loss    
Money market fund 0  
Equity securities-unlisted company 0 0
Subtotal 0 0
Financial assets measured at fair value through other comprehensive income    
Equity securities-unlisted company 0 0
Total 0 0
Level 3 [Member]    
Financial assets measured at fair value through profit or loss    
Equity securities-unlisted company 13,966 13,500
Subtotal 13,966 13,500
Financial assets measured at fair value through other comprehensive income    
Equity securities-unlisted company 742 709
Total $ 14,708 $ 14,209