Summary of Significant Accounting Policies (Policies)	12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation On July 31, 2018, Magnolia consummated its initial business combination (the “Business Combination”) through its acquisition of certain oil and natural gas assets in the Karnes County portion of the Eagle Ford Shale in South Texas (the “Karnes County Assets” and, such business, the “Karnes County Business”), certain oil and natural gas assets in the Giddings area of the Austin Chalk (the “Giddings Assets”), and a 35.0% membership interest in Ironwood Eagle Ford Midstream, LLC (the “Ironwood Interests”), which owns an Eagle Ford gathering system, each with certain affiliates of EnerVest, Ltd. (“EnerVest”). As of December 31, 2020, Magnolia owned a 65.6% interest in Magnolia Oil & Gas Parent LLC (“Magnolia LLC”), which owns the assets acquired in the Business Combination. In accordance with accounting principles generally accepted in the United States of America (“GAAP”), the Company was the acquirer in the Business Combination and the Karnes County Business, the Giddings Assets, and the Ironwood Interests were the acquirees. The Karnes County Business including, as applicable, its ownership of the Ironwood Interests, was deemed the “Predecessor” for periods prior to the Business Combination, and does not include the consolidation of the Company and the Giddings Assets. Although EnerVest Energy Institutional Fund XIV-A, L.P., EnerVest Energy Institutional Fund XIV-C, L.P., EnerVest Energy Institutional Fund XIV-WIC, L.P., EnerVest Energy Institutional Fund XIV-2A, L.P. and EnerVest Energy Institutional Fund XIV-3A, L.P. (collectively, the “Karnes County Contributors”) are not under common control, each were managed by the same managing general partner, EnerVest, and as such, the Predecessor financial statements have been presented on a combined basis for financial reporting purposes. For the periods on or after the Business Combination, the Company, including the combination of the Karnes County Business, the Giddings Assets, and the Ironwood Interests, is the accounting successor (“Successor”). The financial statements and certain footnote presentations separate the Company’s presentations into two distinct periods, the period before the consummation of the Business Combination, which includes the period from January 1, 2018 to July 30, 2018 (the “2018 Predecessor Period”); and the period after the Business Combination, which includes the period from July 31, 2018 to December 31, 2018 (the “2018 Successor Period”), the year ended December 31, 2019, and the year ended December 31, 2020. The Business Combination was accounted for using the acquisition method of accounting and the Successor financial statements reflect a new basis of accounting that is based on the fair value of assets acquired and liabilities assumed. As a result of the inclusion of the Giddings Assets, the new basis of accounting, and certain other items that affect comparability, the Company’s financial information prior to the Business Combination is not comparable to its financial information subsequent to the Business Combination. The assets, liabilities, revenues, expenses, and cash flows related to the Karnes County Business were not previously separately accounted for as a standalone legal entity and have been carved out of the overall assets, liabilities, revenues, expenses, and cash flows from the Karnes County Contributors as appropriate. In addition, Parents’ Net Investment represents the Karnes County Contributors’ interest in the recorded net assets of the Karnes County Business and represents the cumulative net investment of the Karnes County Contributors’ in the Karnes County Business through the dates presented, inclusive of cumulative operating results. The Karnes County Contributors utilized EnerVest’s centralized processes and systems for its treasury services and the Karnes County Business’ cash activity was commingled with other oil and natural gas assets that were not part of the Business Combination. As such, the net results of the cash transactions between the Karnes County Business and the Karnes County Contributors are reflected as Parents’ contributions in the accompanying combined statement of changes in parents’ net investment. The Predecessor financial statements also include a portion of indirect costs for salaries and benefits, rent, accounting, legal services, and other expenses. In addition to the allocation of indirect costs, the financial statements reflect certain agreements executed by the Karnes County Contributors for the benefit of the Karnes County Business, including price risk management instruments. The allocations methodologies for significant allocated items include: Corporate G&A - EnerVest, as managing general partner of the Karnes County Contributors, provided management, accounting, and advisory services to the Karnes County Contributors in exchange for a quarterly management fee based on the Karnes County Contributors’ investor commitments, which were used, in part, to acquire the Karnes County Business as well as other oil and natural gas properties that were not part of the Business Combination. As such, the management fee was allocated to the Karnes County Business using a ratio of asset acquisitions value to total asset acquisitions completed by the Karnes County Contributors, for the 2018 Predecessor Period. Derivatives - Certain Karnes County Contributors entered into financial instruments to manage the Karnes County Business’ exposure to changes in commodity prices for the Karnes County Business as well as other oil and natural gas properties that were not part of the Business Combination, on a combined basis. The commodity derivative activity was allocated to the Karnes County Business using a ratio of expected crude oil and condensate, NGLs, and natural gas volumes produced, on an equivalents basis, by the Karnes County Business to the Karnes County Contributors’ total expected crude oil and condensate, NGLs, and natural gas produced, on an equivalents basis, for the 2018 Predecessor Period. Indebtedness - The Karnes County Business did not historically have outstanding indebtedness, but its oil and natural gas properties were collateral to various credit facilities held by the Karnes County Contributors and/or EnerVest. Amounts outstanding on these credit facilities have not been allocated to the Karnes County Business as they were not directly attributable to the Karnes County Business. Management believes the allocation methodologies used are reasonable and result in an allocation of the indirect costs and other items to operate the Karnes County Business as if it were a stand-alone entity. These allocations, however, may not be indicative of the cost of future operations or the amount of future allocations. Direct costs were included at the historical amounts related to each reported period. The accompanying consolidated and combined financial statements have been prepared in accordance with GAAP and in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”).
Principles of Consolidation	Principles of Consolidation (Successor) The consolidated financial statements have been prepared in accordance with GAAP. Certain reclassifications of prior period financial statements have been made to conform to current reporting practices. The consolidated financial statements include the accounts of the Company and its subsidiaries after elimination of intercompany transactions and balances. The Company’s interests in oil and natural gas exploration and production ventures and partnerships are proportionately consolidated. The Company reflects a noncontrolling interest representing the interest owned by the Karnes County Contributors through their ownership of Magnolia LLC Units in the consolidated financial statements. The noncontrolling interest is presented as a component of equity. See Note 13 —Stockholders’ Equity for further discussion of noncontrolling interest.
Variable Interest Entities	Variable Interest Entities (Successor) Magnolia LLC is a variable interest entity (“VIE”). The Company determined that it is the primary beneficiary of Magnolia LLC as the Company is the sole managing member and has the power to direct the activities most significant to Magnolia LLC’s economic performance as well as the obligation to absorb losses and receive benefits that are potentially significant. At December 31, 2020, the Company had an approximate 65.6% economic interest in Magnolia LLC and 100% of Magnolia LLC’s assets, liabilities, and results of operations are consolidated in the Company’s consolidated financial statements contained herein. At December 31, 2020, the Karnes County Contributors had approximately 34.4% economic interest in Magnolia LLC; however, the Karnes County Contributors have disproportionately fewer voting rights, and are shown as noncontrolling interest holders of Magnolia LLC. See Note 13—Stockholders’ Equity for further discussion of the noncontrolling interest.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates, and changes in these estimates are recorded when known. Significant estimates with regard to these financial statements include the fair value determination of acquired assets and liabilities, the assessment of asset retirement obligations, the estimate of proved oil and natural gas reserves and related present value estimates of future net cash flows, and the estimates of fair value for long-lived assets.
Cash and Cash Equivalents	Cash and Cash EquivalentsCash and cash equivalents include cash on hand and short-term, highly liquid investments that are readily convertible to cash.
Accounts Receivable and Allowance for Expected Credit Losses	Accounts Receivable and Allowance for Expected Credit Losses (Successor) In June 2016, the FASB issued Accounting Standards Update (“ASU”) 2016-13, Financial Instruments-Credit Losses (Topic 326): “Measurement of Credit Losses on Financial Instruments.” For public business entities, the new standard became effective for annual reporting periods beginning after December 15, 2019, including interim periods within that reporting period. Magnolia adopted this standard on January 1, 2020. The standard changes the impairment model for most financial assets and certain other instruments, including trade and other receivables, and requires entities to use a new forward-looking expected loss model that will result in earlier recognition of allowance for losses. The Company’s receivables consist mainly of trade receivables from commodity sales and joint interest billings due from owners on properties the Company operates. The majority of these receivables have payment terms of 30 days or less. For receivables due from joint interest owners, the Company generally has the ability to withhold future revenue disbursements to recover non-payment of joint interest billings. From an evaluation of the Company’s existing credit portfolio, historical credit losses have been de minimis and are expected to remain so in the future assuming no substantial changes to the business or creditworthiness of Magnolia’s business partners. As expected, there was no material impact on the Company’s consolidated financial statements or disclosures upon adoption of this ASU.
Oil and Natural Gas Properties	Oil and Natural Gas Properties The Company follows the successful efforts method of accounting for its oil and natural gas properties. Under this method of accounting, exploration costs such as exploratory geological and geophysical costs, delay rentals, and exploration overhead are expensed as incurred. All costs related to production, general corporate overhead, and similar activities are expensed as incurred. If an exploratory well provides evidence to justify potential development of reserves, drilling costs associated with the well are initially capitalized, or suspended, pending a determination as to whether a commercially sufficient quantity of proved reserves can be attributed to the area as a result of drilling. At the end of each quarter, management reviews the status of all suspended exploratory well costs in light of ongoing exploration activities; in particular, whether the Company is making sufficient progress in its ongoing exploration and appraisal efforts. If management determines that future appraisal drilling or development activities are unlikely to occur, associated suspended exploratory well costs are expensed. Unproved properties are assessed for impairment at least annually and are transferred to proved oil and natural gas properties to the extent the costs are associated with successful exploration activities. Unproved properties are assessed for impairment based on the Company’s current exploration plans. Costs of expired or abandoned leases are charged to exploration expense, while costs of productive leases are transferred to proved oil and natural gas properties. Costs of maintaining and retaining unproved properties, as well as impairment of unsuccessful leases, are included in “Exploration expense” in the consolidated and combined statements of operations. Costs to develop proved reserves, including the costs of all development wells and related equipment used in the production of crude oil and natural gas, are capitalized. Depreciation, depletion and amortization of the cost of proved oil and natural gas properties is calculated using the unit-of-production method. The reserve base used to calculate depletion for leasehold acquisition costs and the cost to acquire proved properties is the sum of proved developed reserves and proved undeveloped reserves. The reserve base used to calculate the depreciation for capitalized costs for exploratory and development wells is the sum of proved developed reserves only. Estimated future abandonment costs, net of salvage values, are included in the depreciable cost. Oil and natural gas properties are grouped for depreciation, depletion and amortization in accordance with the Accounting Standards Codification (“ASC”) ASC 932 “Extractive Activities—Oil and Gas” (“ASC 932”). The basis for grouping is a reasonable aggregation of properties with a common geological structural feature or stratigraphic condition, such as a reservoir or field. When circumstances indicate that proved oil and natural gas properties may be impaired, the Company compares unamortized capitalized costs to the expected undiscounted pre-tax future cash flows for the associated assets grouped at the lowest level for which identifiable cash flows are independent of cash flows of other assets. If the expected undiscounted pre-tax future cash flows, based on the Company’s estimate of future crude oil and natural gas prices, operating costs, anticipated production from proved reserves, and other relevant data, are lower than the unamortized capitalized cost, the capitalized cost is reduced to fair value. Fair value is generally estimated using the income approach described in ASC 820, “Fair Value Measurements” (“ASC 820”). If applicable, the Company may utilize prices and other relevant information generated by market transactions involving assets and liabilities that are identical or comparable to the item being measured as the basis for determining fair value. The expected future cash flows used for impairment reviews and related fair value calculations are typically based on judgmental assessments of future production volumes, commodity prices, operating costs, and capital investment plans, considering all available information at the date of review. These assumptions are applied to develop future cash flow projections that are then discounted to estimated fair value, using a discount rate believed to be consistent with those applied by market participants. See Note 5—Fair Value Measurements for further discussion.
Asset Retirement Obligations	Asset Retirement Obligations Asset retirement obligations (“ARO”) represent the present value of the estimated cash flows expected to be incurred to plug, abandon, and remediate producing properties, excluding salvage values, at the end of their productive lives in accordance with applicable laws. The significant unobservable inputs to this fair value measurement include estimates of plugging, abandonment, and remediation costs, well life, inflation, and credit-adjusted risk-free rate. The inputs are calculated based on historical data as well as current estimates. When the liability is initially recorded, the carrying amount of the related long-lived asset is increased. Over time, accretion of the liability is recognized each period, and the capitalized cost is amortized over the useful life of the related asset using the unit of production method and is included in “Depreciation, depletion and amortization” in the Company’s consolidated and combined statements of operations. If the ARO is settled for an amount other than the recorded amount, a gain or loss is recognized. To estimate the fair value of an asset retirement obligation, the Company employs a present value technique, which reflects certain assumptions, including its credit‑adjusted risk‑free interest rate, inflation rate, the estimated settlement date of the liability, and the estimated cost to settle the liability. Changes in timing or to the original estimate of cash flows will result in changes to the carrying amount of the liability and related long lived asset.
Intangible Assets	Intangible Assets (Successor)Concurrent with the closing of the Business Combination, the Company and EnerVest entered into a non-compete agreement (the “Non-Compete”) pursuant to which EnerVest and certain of its affiliates are restricted from competing with the Company in certain counties comprising the Eagle Ford Shale. On the Closing Date, the Company recorded an estimated cost of $44.4 million for the Non-Compete as intangible assets on the consolidated balance sheet of the Successor. These intangible assets have a definite life and are subject to amortization utilizing the straight-line method over their economic life, currently estimated to be two and one half to four years. Magnolia assesses intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment is recognized in the consolidated statements of operations if the carrying amount of an intangible asset is not recoverable and its carrying amount exceeds its fair value.
Fair Value Measurements	Fair Value Measurements ASC 820 establishes a fair value hierarchy that prioritizes and ranks the level of observability of inputs used to measure investments at fair value. The observability of inputs is impacted by a number of factors, including the type of investment, characteristics specific to the investment, market conditions, and other factors. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level I measurements) and the lowest priority to unobservable inputs (Level III measurements). Investments with readily available quoted prices or for which fair value can be measured from quoted prices in active markets will typically have a higher degree of input observability and a lesser degree of judgment applied in determining fair value. The three levels of the fair value hierarchy under ASC 820 are as follows: Level I—Quoted prices (unadjusted) in active markets for identical investments at the measurement date are used. Level II—Pricing inputs are other than quoted prices included within Level I that are observable for the investment, either directly or indirectly. Level II pricing inputs include quoted prices for similar investments in active markets, quoted prices for identical or similar investments in markets that are not active, inputs other than quoted prices that are observable for the investment, and inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level III—Pricing inputs are unobservable and include situations where there is little, if any, market activity for the investment. The inputs used in determination of fair value require significant judgment and estimation. In some cases, the inputs used to measure fair value might fall within different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the investment is categorized in its entirety is determined based on the lowest level input that is significant to the investment. Assessing the significance of a particular input to the valuation of an investment in its entirety requires judgment and considers factors specific to the investment. The categorization of an investment within the hierarchy is based upon the pricing transparency of the investment and does not necessarily correspond to the perceived risk of that investment.
Income Taxes	Income Taxes (Predecessor) The Karnes County Contributors, on behalf of the Predecessor, had elected under the Internal Revenue Code provisions to be treated as individual partnerships for tax purposes. Accordingly, items of income, expense, gains, and losses flowed through to the partners and were taxed at the partner level. Accordingly, no tax provision for federal income taxes was included in the financial statements. The Predecessor was subject to the Texas margin tax, which is considered a state income tax, and was included in “Income Tax Expense” on the combined statements of operations. The Predecessor recorded state income tax (current and deferred) based on taxable income, as defined under the rules for the margin tax. The Predecessor analyzed each income tax position using a two-step process. A determination was first made as to whether it was more likely than not that the income tax position would be sustained, based upon technical merits, upon examination by the taxing authorities. If the income tax position was expected to meet the more likely than not criteria, the benefit recorded in the combined financial statements equaled the largest amount that was greater than 50% likely to be realized upon its ultimate settlement. The Predecessor recorded income tax, related interest, and penalties, if any, as a component of income tax expense. The Predecessor did not incur any interest or penalties on income for the period from January 1, 2018 to July 30, 2018. None of the Karnes County Contributors’ state tax returns are currently under examination by the relevant authorities. Income Taxes (Successor) Under ASC 740, “Income Taxes,” deferred tax assets and liabilities are recognized for the expected future tax consequences attributable to net operating losses, tax credits, and temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period of the enactment date. Valuation allowances are established when it is more likely than not that some or all of the deferred tax assets will not be realized. The Company reports a liability or a reduction of deferred tax assets for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return. When applicable, the Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense.
Derivatives	Derivatives (Predecessor) The Karnes County Contributors, on behalf of the Predecessor, monitored the exposure to various business risks, including commodity price risk, and used derivatives to manage the impact of certain of these risks. The Karnes County Contributors used energy derivatives for mitigating risk resulting from fluctuations in the market price of oil, natural gas, and NGLs, and their policies did not permit the use of derivatives for speculative purposes. The Predecessor elected not to designate its derivatives as hedging instruments. Changes in the fair value of derivatives were recorded immediately to earnings as “Gain (loss) on derivatives, net” in the combined statements of operations. Derivatives (Successor) Magnolia currently utilizes natural gas costless collars to reduce its exposure to price volatility for a portion of its natural gas production volumes. The Company’s policies do not permit the use of derivative instruments for speculative purposes. The Company has elected not to designate any of its derivative instruments as hedging instruments. Accordingly, changes in the fair value of the Company’s derivative instruments are recorded immediately to earnings as “Gain (loss) on derivatives, net” on the Company’s consolidated statements of operations.
Purchase Price Allocation	Purchase Price Allocation Accounting for the acquisition of a business requires the allocation of the purchase price to the various assets and liabilities of the acquired business and recording deferred taxes for any differences between the allocated values and tax basis of assets and liabilities. Any excess of the purchase price over the amounts assigned to assets and liabilities is recorded as goodwill. The purchase price allocation is accomplished by recording each asset and liability at its estimated fair value. Estimated deferred taxes are based on available information concerning the tax basis of the acquired company’s assets, liabilities, and tax-related carryforwards at the merger date, although such estimates may change in the future as additional information becomes known. The amount of goodwill recorded in any particular business combination can vary significantly depending upon the values attributed to assets acquired and liabilities assumed relative to the total acquisition cost. When estimating the fair values of assets acquired and liabilities assumed, the Company must apply various assumptions. The most significant assumptions relate to the estimated fair values assigned to proved and unproved crude oil and natural gas properties. To estimate the fair values of these properties, the Company prepares estimates of crude oil and natural gas reserves. Estimated fair values assigned to assets acquired can have a significant effect on results of operations in the future.
Commitments and Contingencies	Commitments and ContingenciesAccruals for loss contingencies arising from claims, assessments, litigation, environmental, and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated. These accruals are adjusted as additional information becomes available or circumstances change. Refer to Note 11 - Commitments and Contingencies for additional information.
Revenue Recognition	Revenue Recognition (Predecessor) Oil, natural gas, and NGL revenues were recognized when production was sold to a purchaser at a fixed or determinable price, when delivery had occurred and title had transferred, and collectability of the revenue was reasonably assured. The Predecessor followed the sales method of accounting for revenues. Under this method of accounting, revenues were recognized based on volumes sold, which may have differed from the volumes entitled based on the Karnes County Business’ working interest. There were no material natural gas imbalances during the periods presented. Revenue Recognition (Successor) In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers.” This ASU and the associated subsequent amendments (collectively, “ASC 606”), superseded virtually all of the revenue recognition guidance in GAAP by requiring companies to recognize revenue using a five-step model. The core principle of the five-step model is that an entity will recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. Magnolia adopted this standard on December 31, 2018 for the Successor Periods using a modified retrospective approach. There were no significant changes to the timing of revenue recognized for sales of production as a result of ASC 606. However, the new guidance resulted in certain changes to the classification of processing and other fees between revenue and gathering, transportation, and processing expense. The amounts reclassified are immaterial to the financial statements and Predecessor Periods have not been restated and continue to be reported under the accounting standards in effect for those periods. Magnolia’s revenues include the sale of crude oil, natural gas, and NGLs. Oil, natural gas, and NGL sales are recognized as revenue when production is sold to a customer in fulfillment of performance obligations under the terms of agreed contracts. Performance obligations are primarily comprised of delivery of oil, natural gas, or NGLs at a delivery point, as negotiated within each contract. Each barrel of oil, million Btu of natural gas, gallon of NGLs, or other unit of measure is separately identifiable and represents a distinct performance obligation to which the transaction price is allocated. The Company’s oil production is primarily sold under market-sensitive contracts that are typically priced at a differential to the NYMEX price or at purchaser posted prices for the producing area. For oil contracts, the Company generally records sales based on the net amount received. For natural gas contracts, the Company generally records wet gas sales (which consists of natural gas and NGLs based on end products after processing) at the wellhead or inlet of the natural gas processing plant (i.e., the point of control transfer) as revenues net of gathering, transportation, and processing expenses if the processor is the customer and there is no redelivery of commodities to the Company at the tailgate of the plant. Conversely, the Company generally records residual natural gas and NGL sales at the tailgate of the plant (i.e., the point of control transfer) on a gross basis along with the associated gathering, transportation, and processing expenses if the processor is a service provider and there is redelivery of one or several commodities to the Company at the tailgate of the plant. The facts and circumstances of an arrangement are considered and judgment is often required in making this determination. For processing contracts that require noncash consideration in exchange for processing services, the Company recognizes revenue and an equal gathering, transportation, and processing expense for commodities transferred to the service provider. Customers are invoiced once the Company’s performance obligations have been satisfied. Payment terms and conditions vary by contract type, although terms generally include a requirement of payment within 30 days. There are no judgments that significantly affect the amount or timing of revenue from contracts with customers. Additionally, the Company’s product sales contracts do not give rise to material contract assets or contract liabilities. The Company’s receivables consist mainly of receivables from oil and natural gas purchasers and from joint interest owners on properties the Company operates. Receivables from contracts with customers totaled $72.0 million and $100.4 million as of December 31, 2020 and 2019, respectively. Accounts receivable are stated at the historical carrying amount net of write-offs and allowance for doubtful accounts. The Company routinely assesses the collectability of all material trade and other receivables. The Company’s receivables consist mainly of receivables from oil and natural gas purchasers and from joint interest owners on properties the Company operates. The Company accrues a reserve on a receivable when, based on the judgment of management, it is probable that a receivable will not be collected and the amount of any reserve may be reasonably estimated. The Company had no allowance for doubtful accounts as of December 31, 2020 or 2019. The Company has concluded that disaggregating revenue by product type appropriately depicts how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors and has reflected this disaggregation of revenue on the Company’s consolidated and combined statements of operations for all periods presented. Performance obligations are satisfied at a point in time once control of the product has been transferred to the customer. The Company considers a variety of facts and circumstances in assessing the point of control transfer, including but not limited to: whether the purchaser can direct the use of the hydrocarbons, the transfer of significant risks and rewards, the Company’s right to payment, and transfer of legal title. The Company does not disclose the value of unsatisfied performance obligations for contracts as all contracts have either an original expected length of one year or less, or the entire future consideration is variable and allocated entirely to a wholly unsatisfied performance obligation.
Net Income or Loss Per Share of Common Stock (Successor)	Net Income or Loss Per Share of Common Stock (Successor) The Company’s basic earnings or loss per share (“EPS”) is computed based on the weighted average number of shares of Class A Common Stock outstanding for the period. Diluted EPS includes the effect of the Company’s outstanding restricted stock units (“RSUs”), performance stock units (“PSUs”), warrants exchanged for Class A Common Stock and exchanges or repurchases of Class B Common Stock if the inclusion of these items is dilutive. Refer to Note 15 - Earnings (Loss) Per Share for additional information and the calculation of EPS.
Stock Based Compensation	Stock Based Compensation (Successor) Magnolia has established a long-term incentive plan for certain employees and directors that allows for granting RSUs and PSUs. RSUs granted are valued on the date of the grant using the quoted market price of Magnolia's Class A Common Stock. PSUs granted are valued based on the grant date fair value determined using Monte Carlo simulations, which use a probabilistic approach for estimating the fair value of the awards. Both RSUs and PSUs are expensed on a straight-line basis over the requisite service period. The Company records expense associated with the fair value of stock based compensation under the fair value recognition provisions of ASC Topic 718, “Compensation-Stock Compensation” and that expense is included within “General and administrative expenses” and “Lease operating expenses” in the accompanying consolidated statements of operations. The Company accounts for forfeitures as they occur. These plans and related accounting policies are defined and described more fully in Note 14 - Stock Based Compensation.
Leases	Leases (Successor) In February 2016, the FASB issued ASU No. 2016-02, Leases, which requires lessees to recognize a right-of-use asset and a lease liability on their balance sheet for all leases, including operating leases, with a term of greater than 12 months. In July 2018, the FASB issued ASU 2018-11, which adds a transition option permitting entities to apply the provisions of the new standard at its adoption date instead of the earliest comparative period presented in the consolidated financial statements. Under this transition option, comparative reporting would not be required, and the provisions of the standard would be applied prospectively to leases in effect at the date of adoption. The Company elected the package of transition practical expedients provided by the new standard that allow the Company to not reassess under the new standard its prior conclusions about lease identification, classification related to contracts that commenced prior to adoption, and to apply the standard prospectively to all new or modified land easements and rights-of-way. The Company has also elected a policy to not recognize right of use assets and lease liabilities related to short-term leases. The Company has lease agreements with lease and non-lease components, which are generally accounted for as a single lease component. Magnolia adopted this standard on January 1, 2019 and recognized right of use assets and lease liabilities for certain commitments primarily related to real estate, vehicles, and field equipment, while prior reporting periods are presented in accordance with historical accounting treatment under ASC Topic 840, Leases (“ASC 840”). The Company determines if an arrangement is a lease at inception. Operating leases are included in other long-term assets, other current liabilities, and other long-term liabilities in Magnolia’s consolidated balance sheet as of December 31, 2020. Operating lease right-of-use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. Magnolia’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expenses for lease payments are recognized on a straight-line basis over the lease term. For more information, refer to Note 10 - Leases.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): “Simplifying the Accounting for Income Taxes,” which reduces the complexity of accounting for income taxes by removing certain exceptions to the general principles and also simplifying areas such as separate entity financial statements and interim recognition of enactment of tax laws or rate changes. This standard is effective for interim and annual periods beginning after December 15, 2020 and shall be applied on either a prospective basis, a retrospective basis for all periods presented, or a modified retrospective basis through a cumulative-effect adjustment to retained earnings depending on which aspects of the new standard are applicable to an entity. The Company is currently evaluating the effect of this standard, but does not expect the adoption of this guidance to have a material impact on its financial position, cash flows, or result of operations.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2020

On July 31, 2018, Magnolia consummated its initial business combination (the “Business Combination”) through its acquisition of certain oil and natural gas assets in the Karnes County portion of the Eagle Ford Shale in South Texas (the “Karnes County Assets” and, such business, the “Karnes County Business”), certain oil and natural gas assets in the Giddings area of the Austin Chalk (the “Giddings Assets”), and a 35.0% membership interest in Ironwood Eagle Ford Midstream, LLC (the “Ironwood Interests”), which owns an Eagle Ford gathering system, each with certain affiliates of EnerVest, Ltd. (“EnerVest”). As of December 31, 2020, Magnolia owned a 65.6% interest in Magnolia Oil & Gas Parent LLC (“Magnolia LLC”), which owns the assets acquired in the Business Combination.

In accordance with accounting principles generally accepted in the United States of America (“GAAP”), the Company was the acquirer in the Business Combination and the Karnes County Business, the Giddings Assets, and the Ironwood Interests were the acquirees. The Karnes County Business including, as applicable, its ownership of the Ironwood Interests, was deemed the “Predecessor” for periods prior to the Business Combination, and does not include the consolidation of the Company and the Giddings Assets. Although EnerVest Energy Institutional Fund XIV-A, L.P., EnerVest Energy Institutional Fund XIV-C, L.P., EnerVest Energy Institutional Fund XIV-WIC, L.P., EnerVest Energy Institutional Fund XIV-2A, L.P. and EnerVest Energy Institutional Fund XIV-3A, L.P. (collectively, the “Karnes County Contributors”) are not under common control, each were managed by the same managing general partner, EnerVest, and as such, the Predecessor financial statements have been presented on a combined basis for financial reporting purposes.

For the periods on or after the Business Combination, the Company, including the combination of the Karnes County Business, the Giddings Assets, and the Ironwood Interests, is the accounting successor (“Successor”). The financial statements and certain footnote presentations separate the Company’s presentations into two distinct periods, the period before the consummation of the Business Combination, which includes the period from January 1, 2018 to July 30, 2018 (the “2018 Predecessor Period”); and the period after the Business Combination, which includes the period from July 31, 2018 to December 31, 2018 (the “2018 Successor Period”), the year ended December 31, 2019, and the year ended December 31, 2020. The Business Combination was accounted for using the acquisition method of accounting and the Successor financial statements reflect a new basis of accounting that is based on the fair value of assets acquired and liabilities assumed. As a result of the inclusion of the Giddings Assets, the new basis of accounting, and certain other items that affect comparability, the Company’s financial information prior to the Business Combination is not comparable to its financial information subsequent to the Business Combination.

The assets, liabilities, revenues, expenses, and cash flows related to the Karnes County Business were not previously separately accounted for as a standalone legal entity and have been carved out of the overall assets, liabilities, revenues, expenses, and cash flows from the Karnes County Contributors as appropriate. In addition, Parents’ Net Investment represents the Karnes County Contributors’ interest in the recorded net assets of the Karnes County Business and represents the cumulative net investment of the Karnes County Contributors’ in the Karnes County Business through the dates presented, inclusive of cumulative operating results.

The Karnes County Contributors utilized EnerVest’s centralized processes and systems for its treasury services and the Karnes County Business’ cash activity was commingled with other oil and natural gas assets that were not part of the Business Combination. As such, the net results of the cash transactions between the Karnes County Business and the Karnes County Contributors are reflected as Parents’ contributions in the accompanying combined statement of changes in parents’ net investment.

The Predecessor financial statements also include a portion of indirect costs for salaries and benefits, rent, accounting, legal services, and other expenses. In addition to the allocation of indirect costs, the financial statements reflect certain agreements executed by the Karnes County Contributors for the benefit of the Karnes County Business, including price risk management instruments. The allocations methodologies for significant allocated items include:

Corporate G&A - EnerVest, as managing general partner of the Karnes County Contributors, provided management, accounting, and advisory services to the Karnes County Contributors in exchange for a quarterly management fee based on the Karnes County Contributors’ investor commitments, which were used, in part, to acquire the Karnes County Business as well as other oil and natural gas properties that were not part of the Business Combination. As such, the management fee was allocated to the Karnes County Business using a ratio of asset acquisitions value to total asset acquisitions completed by the Karnes County Contributors, for the 2018 Predecessor Period.

Derivatives - Certain Karnes County Contributors entered into financial instruments to manage the Karnes County Business’ exposure to changes in commodity prices for the Karnes County Business as well as other oil and natural gas properties that were not part of the Business Combination, on a combined basis. The commodity derivative activity was allocated to the Karnes County Business using a ratio of expected crude oil and condensate, NGLs, and natural gas volumes produced, on an equivalents basis, by the Karnes County Business to the Karnes County Contributors’ total expected crude oil and condensate, NGLs, and natural gas produced, on an equivalents basis, for the 2018 Predecessor Period.

Indebtedness - The Karnes County Business did not historically have outstanding indebtedness, but its oil and natural gas properties were collateral to various credit facilities held by the Karnes County Contributors and/or EnerVest. Amounts outstanding on these credit facilities have not been allocated to the Karnes County Business as they were not directly attributable to the Karnes County Business.

Management believes the allocation methodologies used are reasonable and result in an allocation of the indirect costs and other items to operate the Karnes County Business as if it were a stand-alone entity. These allocations, however, may not be indicative of the cost of future operations or the amount of future allocations. Direct costs were included at the historical amounts related to each reported period.

The accompanying consolidated and combined financial statements have been prepared in accordance with GAAP and in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”).

Principles of Consolidation

Principles of Consolidation (Successor)

The consolidated financial statements have been prepared in accordance with GAAP. Certain reclassifications of prior period financial statements have been made to conform to current reporting practices. The consolidated financial statements include the accounts of the Company and its subsidiaries after elimination of intercompany transactions and balances. The Company’s interests in oil and natural gas exploration and production ventures and partnerships are proportionately consolidated. The Company reflects a noncontrolling interest representing the interest owned by the Karnes County Contributors through their ownership of Magnolia LLC Units in the consolidated financial statements. The noncontrolling interest is presented as a component of equity. See Note 13 —Stockholders’ Equity for further discussion of noncontrolling interest.

Variable Interest Entities

Variable Interest Entities (Successor)

Magnolia LLC is a variable interest entity (“VIE”). The Company determined that it is the primary beneficiary of Magnolia LLC as the Company is the sole managing member and has the power to direct the activities most significant to Magnolia LLC’s economic performance as well as the obligation to absorb losses and receive benefits that are potentially significant. At December 31, 2020, the Company had an approximate 65.6% economic interest in Magnolia LLC and 100% of Magnolia LLC’s assets, liabilities, and results of operations are consolidated in the Company’s consolidated financial statements contained herein. At December 31, 2020, the Karnes County Contributors had approximately 34.4% economic interest in Magnolia LLC; however, the Karnes County Contributors have disproportionately fewer voting rights, and are shown as noncontrolling interest holders of Magnolia LLC. See Note 13—Stockholders’ Equity for further discussion of the noncontrolling interest.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires the Company’s management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates, and changes in these estimates are recorded when known. Significant estimates with regard to these financial statements include the fair value determination of acquired assets and liabilities, the assessment of asset retirement obligations, the estimate of proved oil and natural gas reserves and related present value estimates of future net cash flows, and the estimates of fair value for long-lived assets.

Cash and Cash Equivalents

Cash and Cash EquivalentsCash and cash equivalents include cash on hand and short-term, highly liquid investments that are readily convertible to cash.

Accounts Receivable and Allowance for Expected Credit Losses

Accounts Receivable and Allowance for Expected Credit Losses (Successor)

In June 2016, the FASB issued Accounting Standards Update (“ASU”) 2016-13, Financial Instruments-Credit Losses (Topic 326): “Measurement of Credit Losses on Financial Instruments.” For public business entities, the new standard became effective for annual reporting periods beginning after December 15, 2019, including interim periods within that reporting period. Magnolia adopted this standard on January 1, 2020. The standard changes the impairment model for most financial assets and certain other instruments, including trade and other receivables, and requires entities to use a new forward-looking expected loss model that will result in earlier recognition of allowance for losses. The Company’s receivables consist mainly of trade receivables from commodity sales and joint interest billings due from owners on properties the Company operates. The majority of these receivables have payment terms of 30 days or less. For receivables due from joint interest owners, the Company generally has the ability to withhold future revenue disbursements to recover non-payment of joint interest billings. From an evaluation of the Company’s existing credit portfolio, historical credit losses have been de minimis and are expected to remain so in the future assuming no substantial changes to the business or creditworthiness of Magnolia’s business partners. As expected, there was no material impact on the Company’s consolidated financial statements or disclosures upon adoption of this ASU.

Oil and Natural Gas Properties

The Company follows the successful efforts method of accounting for its oil and natural gas properties. Under this method of accounting, exploration costs such as exploratory geological and geophysical costs, delay rentals, and exploration overhead are expensed as incurred. All costs related to production, general corporate overhead, and similar activities are expensed as incurred. If an exploratory well provides evidence to justify potential development of reserves, drilling costs associated with the well are initially capitalized, or suspended, pending a determination as to whether a commercially sufficient quantity of proved reserves can be attributed to the area as a result of drilling. At the end of each quarter, management reviews the status of all suspended exploratory well costs in light of ongoing exploration activities; in particular, whether the Company is making sufficient progress in its ongoing exploration and appraisal efforts. If management determines that future appraisal drilling or development activities are unlikely to occur, associated suspended exploratory well costs are expensed.

Unproved properties are assessed for impairment at least annually and are transferred to proved oil and natural gas properties to the extent the costs are associated with successful exploration activities. Unproved properties are assessed for impairment based on the Company’s current exploration plans. Costs of expired or abandoned leases are charged to exploration expense, while costs of productive leases are transferred to proved oil and natural gas properties. Costs of maintaining and retaining unproved properties, as well as impairment of unsuccessful leases, are included in “Exploration expense” in the consolidated and combined statements of operations.

Costs to develop proved reserves, including the costs of all development wells and related equipment used in the production of crude oil and natural gas, are capitalized. Depreciation, depletion and amortization of the cost of proved oil and natural gas properties is calculated using the unit-of-production method. The reserve base used to calculate depletion for leasehold acquisition costs and the cost to acquire proved properties is the sum of proved developed reserves and proved undeveloped reserves. The reserve base used to calculate the depreciation for capitalized costs for exploratory and development wells is the sum of proved developed reserves only. Estimated future abandonment costs, net of salvage values, are included in the depreciable cost.

Oil and natural gas properties are grouped for depreciation, depletion and amortization in accordance with the Accounting Standards Codification (“ASC”) ASC 932 “Extractive Activities—Oil and Gas” (“ASC 932”). The basis for grouping is a reasonable aggregation of properties with a common geological structural feature or stratigraphic condition, such as a reservoir or field.

When circumstances indicate that proved oil and natural gas properties may be impaired, the Company compares unamortized capitalized costs to the expected undiscounted pre-tax future cash flows for the associated assets grouped at the lowest level for which identifiable cash flows are independent of cash flows of other assets. If the expected undiscounted pre-tax future cash flows, based on the Company’s estimate of future crude oil and natural gas prices, operating costs, anticipated production from proved reserves, and other relevant data, are lower than the unamortized capitalized cost, the capitalized cost is reduced to fair value. Fair value is generally estimated using the income approach described in ASC 820, “Fair Value Measurements” (“ASC 820”). If applicable, the Company may utilize prices and other relevant information generated by market transactions involving assets and liabilities that are identical or comparable to the item being measured as the basis for determining fair value. The expected future cash flows used for impairment reviews and related fair value calculations are typically based on judgmental assessments of future

production volumes, commodity prices, operating costs, and capital investment plans, considering all available information at the date of review. These assumptions are applied to develop future cash flow projections that are then discounted to estimated fair value, using a discount rate believed to be consistent with those applied by market participants. See Note 5—Fair Value Measurements for further discussion.

Asset Retirement Obligations

Asset retirement obligations (“ARO”) represent the present value of the estimated cash flows expected to be incurred to plug, abandon, and remediate producing properties, excluding salvage values, at the end of their productive lives in accordance with applicable laws. The significant unobservable inputs to this fair value measurement include estimates of plugging, abandonment, and remediation costs, well life, inflation, and credit-adjusted risk-free rate. The inputs are calculated based on historical data as well as current estimates. When the liability is initially recorded, the carrying amount of the related long-lived asset is increased. Over time, accretion of the liability is recognized each period, and the capitalized cost is amortized over the useful life of the related asset using the unit of production method and is included in “Depreciation, depletion and amortization” in the Company’s consolidated and combined statements of operations. If the ARO is settled for an amount other than the recorded amount, a gain or loss is recognized.

To estimate the fair value of an asset retirement obligation, the Company employs a present value technique, which reflects certain assumptions, including its credit‑adjusted risk‑free interest rate, inflation rate, the estimated settlement date of the liability, and the estimated cost to settle the liability. Changes in timing or to the original estimate of cash flows will result in changes to the carrying amount of the liability and related long lived asset.

Intangible Assets

Intangible Assets (Successor)Concurrent with the closing of the Business Combination, the Company and EnerVest entered into a non-compete agreement (the “Non-Compete”) pursuant to which EnerVest and certain of its affiliates are restricted from competing with the Company in certain counties comprising the Eagle Ford Shale. On the Closing Date, the Company recorded an estimated cost of $44.4 million for the Non-Compete as intangible assets on the consolidated balance sheet of the Successor. These intangible assets have a definite life and are subject to amortization utilizing the straight-line method over their economic life, currently estimated to be two and one half to four years. Magnolia assesses intangible assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. An impairment is recognized in the consolidated statements of operations if the carrying amount of an intangible asset is not recoverable and its carrying amount exceeds its fair value.

Fair Value Measurements

ASC 820 establishes a fair value hierarchy that prioritizes and ranks the level of observability of inputs used to measure investments at fair value. The observability of inputs is impacted by a number of factors, including the type of investment, characteristics specific to the investment, market conditions, and other factors. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level I measurements) and the lowest priority to unobservable inputs (Level III measurements). Investments with readily available quoted prices or for which fair value can be measured from quoted prices in active markets will typically have a higher degree of input observability and a lesser degree of judgment applied in determining fair value.

The three levels of the fair value hierarchy under ASC 820 are as follows:

Level I—Quoted prices (unadjusted) in active markets for identical investments at the measurement date are used.

Level II—Pricing inputs are other than quoted prices included within Level I that are observable for the investment, either directly or indirectly. Level II pricing inputs include quoted prices for similar investments in active markets, quoted prices for identical or similar investments in markets that are not active, inputs other than quoted prices that are observable for the investment, and inputs that are derived principally from or corroborated by observable market data by correlation or other means.

Level III—Pricing inputs are unobservable and include situations where there is little, if any, market activity for the investment. The inputs used in determination of fair value require significant judgment and estimation.

In some cases, the inputs used to measure fair value might fall within different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the investment is categorized in its entirety is determined based on the lowest level input that is significant to the investment. Assessing the significance of a particular input to the valuation of an investment in its entirety requires judgment and considers factors specific to the investment. The categorization of an investment within the hierarchy is

based upon the pricing transparency of the investment and does not necessarily correspond to the perceived risk of that investment.

Income Taxes

Income Taxes (Predecessor)

The Karnes County Contributors, on behalf of the Predecessor, had elected under the Internal Revenue Code provisions to be treated as individual partnerships for tax purposes. Accordingly, items of income, expense, gains, and losses flowed through to the partners and were taxed at the partner level. Accordingly, no tax provision for federal income taxes was included in the financial statements. The Predecessor was subject to the Texas margin tax, which is considered a state income tax, and was included in “Income Tax Expense” on the combined statements of operations. The Predecessor recorded state income tax (current and deferred) based on taxable income, as defined under the rules for the margin tax.

The Predecessor analyzed each income tax position using a two-step process. A determination was first made as to whether it was more likely than not that the income tax position would be sustained, based upon technical merits, upon examination by the taxing authorities. If the income tax position was expected to meet the more likely than not criteria, the benefit recorded in the combined financial statements equaled the largest amount that was greater than 50% likely to be realized upon its ultimate settlement.

The Predecessor recorded income tax, related interest, and penalties, if any, as a component of income tax expense. The Predecessor did not incur any interest or penalties on income for the period from January 1, 2018 to July 30, 2018. None of the Karnes County Contributors’ state tax returns are currently under examination by the relevant authorities.

Income Taxes (Successor)

Under ASC 740, “Income Taxes,” deferred tax assets and liabilities are recognized for the expected future tax consequences attributable to net operating losses, tax credits, and temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period of the enactment date. Valuation allowances are established when it is more likely than not that some or all of the deferred tax assets will not be realized.

The Company reports a liability or a reduction of deferred tax assets for unrecognized tax benefits resulting from uncertain tax positions taken or expected to be taken in a tax return. When applicable, the Company recognizes accrued interest and penalties related to unrecognized tax benefits as income tax expense.

Derivatives

Derivatives (Predecessor)

The Karnes County Contributors, on behalf of the Predecessor, monitored the exposure to various business risks, including commodity price risk, and used derivatives to manage the impact of certain of these risks. The Karnes County Contributors used energy derivatives for mitigating risk resulting from fluctuations in the market price of oil, natural gas, and NGLs, and their policies did not permit the use of derivatives for speculative purposes.

The Predecessor elected not to designate its derivatives as hedging instruments. Changes in the fair value of derivatives were recorded immediately to earnings as “Gain (loss) on derivatives, net” in the combined statements of operations.

Derivatives (Successor)

Magnolia currently utilizes natural gas costless collars to reduce its exposure to price volatility for a portion of its natural gas production volumes. The Company’s policies do not permit the use of derivative instruments for speculative purposes. The Company has elected not to designate any of its derivative instruments as hedging instruments. Accordingly, changes in the fair value of the Company’s derivative instruments are recorded immediately to earnings as “Gain (loss) on derivatives, net” on the Company’s consolidated statements of operations.

Purchase Price Allocation

Accounting for the acquisition of a business requires the allocation of the purchase price to the various assets and liabilities of the acquired business and recording deferred taxes for any differences between the allocated values and tax basis of assets and liabilities. Any excess of the purchase price over the amounts assigned to assets and liabilities is recorded as goodwill.

The purchase price allocation is accomplished by recording each asset and liability at its estimated fair value. Estimated deferred taxes are based on available information concerning the tax basis of the acquired company’s assets, liabilities, and tax-related carryforwards at the merger date, although such estimates may change in the future as additional information becomes known. The

amount of goodwill recorded in any particular business combination can vary significantly depending upon the values attributed to assets acquired and liabilities assumed relative to the total acquisition cost. When estimating the fair values of assets acquired and liabilities assumed, the Company must apply various assumptions. The most significant assumptions relate to the estimated fair values assigned to proved and unproved crude oil and natural gas properties. To estimate the fair values of these properties, the Company prepares estimates of crude oil and natural gas reserves. Estimated fair values assigned to assets acquired can have a significant effect on results of operations in the future.

Commitments and Contingencies

Commitments and ContingenciesAccruals for loss contingencies arising from claims, assessments, litigation, environmental, and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated. These accruals are adjusted as additional information becomes available or circumstances change. Refer to Note 11 - Commitments and Contingencies for additional information.

Revenue Recognition

Revenue Recognition (Predecessor)

Oil, natural gas, and NGL revenues were recognized when production was sold to a purchaser at a fixed or determinable price, when delivery had occurred and title had transferred, and collectability of the revenue was reasonably assured. The Predecessor followed the sales method of accounting for revenues. Under this method of accounting, revenues were recognized based on volumes sold, which may have differed from the volumes entitled based on the Karnes County Business’ working interest. There were no material natural gas imbalances during the periods presented.

Revenue Recognition (Successor)

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, “Revenue from Contracts with Customers.” This ASU and the associated subsequent amendments (collectively, “ASC 606”), superseded virtually all of the revenue recognition guidance in GAAP by requiring companies to recognize revenue using a five-step model. The core principle of the five-step model is that an entity will recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. Magnolia adopted this standard on December 31, 2018 for the Successor Periods using a modified retrospective approach.

There were no significant changes to the timing of revenue recognized for sales of production as a result of ASC 606. However, the new guidance resulted in certain changes to the classification of processing and other fees between revenue and gathering, transportation, and processing expense. The amounts reclassified are immaterial to the financial statements and Predecessor Periods have not been restated and continue to be reported under the accounting standards in effect for those periods.

Magnolia’s revenues include the sale of crude oil, natural gas, and NGLs. Oil, natural gas, and NGL sales are recognized as revenue when production is sold to a customer in fulfillment of performance obligations under the terms of agreed contracts. Performance obligations are primarily comprised of delivery of oil, natural gas, or NGLs at a delivery point, as negotiated within each contract. Each barrel of oil, million Btu of natural gas, gallon of NGLs, or other unit of measure is separately identifiable and represents a distinct performance obligation to which the transaction price is allocated.

The Company’s oil production is primarily sold under market-sensitive contracts that are typically priced at a differential to the NYMEX price or at purchaser posted prices for the producing area. For oil contracts, the Company generally records sales based on the net amount received.

For natural gas contracts, the Company generally records wet gas sales (which consists of natural gas and NGLs based on end products after processing) at the wellhead or inlet of the natural gas processing plant (i.e., the point of control transfer) as revenues net of gathering, transportation, and processing expenses if the processor is the customer and there is no redelivery of commodities to the Company at the tailgate of the plant. Conversely, the Company generally records residual natural gas and NGL sales at the tailgate of the plant (i.e., the point of control transfer) on a gross basis along with the associated gathering, transportation, and processing expenses if the processor is a service provider and there is redelivery of one or several commodities to the Company at the tailgate of the plant. The facts and circumstances of an arrangement are considered and judgment is often required in making this determination. For processing contracts that require noncash consideration in exchange for processing services, the Company recognizes revenue and an equal gathering, transportation, and processing expense for commodities transferred to the service provider.

Customers are invoiced once the Company’s performance obligations have been satisfied. Payment terms and conditions vary by contract type, although terms generally include a requirement of payment within 30 days. There are no judgments that significantly

affect the amount or timing of revenue from contracts with customers. Additionally, the Company’s product sales contracts do not give rise to material contract assets or contract liabilities.

The Company’s receivables consist mainly of receivables from oil and natural gas purchasers and from joint interest owners on properties the Company operates. Receivables from contracts with customers totaled $72.0 million and $100.4 million as of December 31, 2020 and 2019, respectively. Accounts receivable are stated at the historical carrying amount net of write-offs and allowance for doubtful accounts. The Company routinely assesses the collectability of all material trade and other receivables. The Company’s receivables consist mainly of receivables from oil and natural gas purchasers and from joint interest owners on properties the Company operates. The Company accrues a reserve on a receivable when, based on the judgment of management, it is probable that a receivable will not be collected and the amount of any reserve may be reasonably estimated. The Company had no allowance for doubtful accounts as of December 31, 2020 or 2019.

The Company has concluded that disaggregating revenue by product type appropriately depicts how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors and has reflected this disaggregation of revenue on the Company’s consolidated and combined statements of operations for all periods presented.

Performance obligations are satisfied at a point in time once control of the product has been transferred to the customer. The Company considers a variety of facts and circumstances in assessing the point of control transfer, including but not limited to: whether the purchaser can direct the use of the hydrocarbons, the transfer of significant risks and rewards, the Company’s right to payment, and transfer of legal title.

The Company does not disclose the value of unsatisfied performance obligations for contracts as all contracts have either an original expected length of one year or less, or the entire future consideration is variable and allocated entirely to a wholly unsatisfied performance obligation.

Net Income or Loss Per Share of Common Stock (Successor)

The Company’s basic earnings or loss per share (“EPS”) is computed based on the weighted average number of shares of Class A Common Stock outstanding for the period. Diluted EPS includes the effect of the Company’s outstanding restricted stock units (“RSUs”), performance stock units (“PSUs”), warrants exchanged for Class A Common Stock and exchanges or repurchases of Class B Common Stock if the inclusion of these items is dilutive. Refer to Note 15 - Earnings (Loss) Per Share for additional information and the calculation of EPS.

Stock Based Compensation

Stock Based Compensation (Successor)

Magnolia has established a long-term incentive plan for certain employees and directors that allows for granting RSUs and PSUs. RSUs granted are valued on the date of the grant using the quoted market price of Magnolia's Class A Common Stock. PSUs granted are valued based on the grant date fair value determined using Monte Carlo simulations, which use a probabilistic approach for estimating the fair value of the awards. Both RSUs and PSUs are expensed on a straight-line basis over the requisite service period. The Company records expense associated with the fair value of stock based compensation under the fair value recognition provisions of ASC Topic 718, “Compensation-Stock Compensation” and that expense is included within “General and administrative expenses” and “Lease operating expenses” in the accompanying consolidated statements of operations. The Company accounts for forfeitures as they occur. These plans and related accounting policies are defined and described more fully in Note 14 - Stock Based Compensation.

Leases

Leases (Successor)

In February 2016, the FASB issued ASU No. 2016-02, Leases, which requires lessees to recognize a right-of-use asset and a lease liability on their balance sheet for all leases, including operating leases, with a term of greater than 12 months. In July 2018, the FASB issued ASU 2018-11, which adds a transition option permitting entities to apply the provisions of the new standard at its adoption date instead of the earliest comparative period presented in the consolidated financial statements. Under this transition option, comparative reporting would not be required, and the provisions of the standard would be applied prospectively to leases in effect at the date of adoption. The Company elected the package of transition practical expedients provided by the new standard that allow the Company to not reassess under the new standard its prior conclusions about lease identification, classification related to contracts that commenced prior to adoption, and to apply the standard prospectively to all new or modified land easements and rights-of-way. The Company has also elected a policy to not recognize right of use assets and lease liabilities related to short-term leases. The Company has lease agreements with lease and non-lease components, which are generally accounted for as a single lease component.

Magnolia adopted this standard on January 1, 2019 and recognized right of use assets and lease liabilities for certain commitments primarily related to real estate, vehicles, and field equipment, while prior reporting periods are presented in accordance with historical accounting treatment under ASC Topic 840, Leases (“ASC 840”). The Company determines if an arrangement is a lease at inception. Operating leases are included in other long-term assets, other current liabilities, and other long-term liabilities in Magnolia’s consolidated balance sheet as of December 31, 2020. Operating lease right-of-use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. Magnolia’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expenses for lease payments are recognized on a straight-line basis over the lease term. For more information, refer to Note 10 - Leases.

Recent Accounting Pronouncements

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): “Simplifying the Accounting for Income Taxes,” which reduces the complexity of accounting for income taxes by removing certain exceptions to the general principles and also simplifying areas such as separate entity financial statements and interim recognition of enactment of tax laws or rate changes. This standard is effective for interim and annual periods beginning after December 15, 2020 and shall be applied on either a prospective basis, a retrospective basis for all periods presented, or a modified retrospective basis through a cumulative-effect adjustment to retained earnings depending on which aspects of the new standard are applicable to an entity. The Company is currently evaluating the effect of this standard, but does not expect the adoption of this guidance to have a material impact on its financial position, cash flows, or result of operations.