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Financial Instruments - Financial Assets Recorded at FVTPL (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Unrealized net gains on short-term investments, equity securities $ (6,137) $ (646)
Realized net gains on short-term investments, equity securities (2,594) 2,669
Gains (losses) on financial assets at fair value through profit or loss 3,543 3,315
Equity securities [member]    
Disclosure of financial assets [line items]    
Unrealized net gains on short-term investments, equity securities (10,577) (83,705)
Realized net gains on short-term investments, equity securities 51,562 0
Gains (losses) on financial assets at fair value through profit or loss 62,139 83,705
Income not recorded at FVTPL $ 900 $ 1,000