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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Fair Value Disclosures [Abstract]    
Fair value of asset retirement obligation liabilities incurred and acquired $ 56 $ 113