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Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Accounting Policies [Abstract]    
Oil, natural gas and NGL sales $ 8,906 $ 6,919
Joint interest accounts receivable 514 1,022
Realized derivative receivable 1,101 2,187
Other accounts receivable 5 0
Total accounts receivable $ 10,526 $ 10,128