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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) - Schedule of NYMEX Prices Used in Determining Future Cash Flows (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 $ / bbl | Dec. 31, 2020 $ / bbl | Jun. 30, 2021 $ / bbl | Jun. 30, 2020 $ / MMBtu $ / bbl
Oil (per barrel) |  |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |  |
Commodity Prices Used in Determining Future Cash Flows (in USD per barrel) | 43.63 | 39.54 | 49.72 | 47.37
Gas (per million BTU) |  |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] |  |  |  |
Commodity Prices Used in Determining Future Cash Flows (in USD per barrel) |  |  | 2.46 | 0

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