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Financial Instruments and Risk Management - Convertible debt instruments (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Financial Instruments and Risk Management  
Transfers into Level 3 of fair value hierarchy, assets $ 0
Transfers into Level 3 of fair value hierarchy, liabilities 0
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period 0
Transfers out of Level 1 into Level 2 of fair value hierarchy, liabilities held at end of reporting period 0
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period 0
Transfers out of Level 2 into Level 1 of fair value hierarchy, liabilities held at end of reporting period 0
Transfers out of Level 3 of fair value hierarchy, assets 0
Transfers out of Level 3 of fair value hierarchy, liabilities $ 0