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Financial Instruments (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Financial assets measured at fair value through profit or loss      
Money market fund $ 0 $ 521 $ 5,017
Equity securities-unlisted company 9,768 1,600 10,562
Subtotal 9,768 2,121 15,579
Financial assets measured at fair value through other comprehensive income      
Equity securities-unlisted company 791 1,522 1,680
Total 10,559 3,643 17,259
Level 1 [Member]      
Financial assets measured at fair value through profit or loss      
Money market fund   521 5,017
Equity securities-unlisted company 0 0 0
Subtotal 0 521 5,017
Financial assets measured at fair value through other comprehensive income      
Equity securities-unlisted company 0 0 0
Total 0 521 5,017
Level 2 [Member]      
Financial assets measured at fair value through profit or loss      
Money market fund   0 0
Equity securities-unlisted company 0 0 0
Subtotal 0 0 0
Financial assets measured at fair value through other comprehensive income      
Equity securities-unlisted company 0 0 0
Total 0 0 0
Level 3 [Member]      
Financial assets measured at fair value through profit or loss      
Money market fund   0 0
Equity securities-unlisted company 9,768 1,600 10,562
Subtotal 9,768 1,600 10,562
Financial assets measured at fair value through other comprehensive income      
Equity securities-unlisted company 791 1,522 1,680
Total $ 10,559 $ 3,122 $ 12,242