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Financial Instruments - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Investments, All Other Investments [Abstract]    
Interest receivable $ 318,000 $ 318,000
Allowance for credit loss 0 0
Available for sales debt securities, current 34,500,000 34,500,000
Available for sales debt securities, non-current $ 26,500,000 $ 26,500,000