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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%

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