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Financial Instruments - Exposure to Credit Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of credit risk exposure [line items]      
Cash and short-term investments $ 167,113 $ 120,564 $ 138,510
Short-term investments 111,946 117,776  
Credit risk [member]      
Disclosure of credit risk exposure [line items]      
Cash and short-term investments 167,113 120,564  
Trade accounts receivable 35,084 66,230  
Supplier advances 8,186 3,391  
Royalty receivable 0 121  
Employee loans $ 552 $ 392