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Financial Instruments - Financial instruments measured at fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial assets measured at fair value through profit or loss    
Equity securities-unlisted company $ 13,500 $ 9,768
Subtotal 13,500 9,768
Financial assets measured at fair value through other comprehensive income    
Equity securities-unlisted company 709 791
Total 14,209 10,559
Level 1 [Member]    
Financial assets measured at fair value through profit or loss    
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 2 [Member]    
Financial assets measured at fair value through profit or loss    
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 13,500 9,768
Subtotal 13,500 9,768
Financial assets measured at fair value through other comprehensive income    
Equity securities-unlisted company 709 791
Total $ 14,209 $ 10,559