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Short Term Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Subclassifications of assets, liabilities and equities [abstract]    
Short-term investments (Note 9) $ 35,337 $ 51,723
Short-term investments, cost 20,781 20,419
Short-term investments, accumulated unrealized holding gains $ 14,556 $ 31,304