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Financial Instruments - Liquidity Risk Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Concentration Risk [Line Items]    
Accounts payable, past due $ 12,107 $ 9,194
Accounts Payable | Supplier Concentration Risk | Four Vendors    
Concentration Risk [Line Items]    
Concentration risk, percentage 64.00%  
Accounts Payable | Supplier Concentration Risk | Three Vendors    
Concentration Risk [Line Items]    
Concentration risk, percentage   42.00%