Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified
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0 Months Ended |
9 Months Ended |
1 Months Ended |
0 Months Ended |
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Aug. 15, 2014
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Mar. 31, 2015
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Mar. 31, 2014
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Oct. 31, 2014
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Oct. 31, 2013
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Oct. 17, 2014
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Oct. 10, 2014
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Jul. 01, 2014
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Jan. 16, 2013
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Jan. 15, 2013
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Number of stock options exercised |
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494,791us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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Issuance of common stock (in shares) |
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272,898us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
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Number of stock options forfeited/canceled |
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2,882,085us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
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41,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
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Value of stock repurchased |
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$ 1,445us-gaap_StockRepurchasedDuringPeriodValue
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Repurchase of common stock |
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566us-gaap_PaymentsForRepurchaseOfCommonStock
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11us-gaap_PaymentsForRepurchaseOfCommonStock
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Stock issued, in shares |
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1,785,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
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Expired (in shares) |
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25,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
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0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
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Unvested options forfeited |
1,369,585us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares
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Exercise price of options (in dollars per share) |
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$ 1.73us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
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TBOs |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock issued, in shares |
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135,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_TimedBasedOptionsMember
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Restricted Stock |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based compensation expense (reversal of expense) |
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(44)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
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PBOs |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock issued, in shares |
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1,250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember
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1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember
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PBOs | CO2-EOR Development Project at Poplar |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Performance metrics weighted average |
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20.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceMetricsWeightedAveragePercentage / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / mpet_PerformanceMetricsWeightedAverageAxis = mpet_CO2EORDevelopmentProjectatPoplarMember
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40.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceMetricsWeightedAveragePercentage / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / mpet_PerformanceMetricsWeightedAverageAxis = mpet_CO2EORDevelopmentProjectatPoplarMember
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PBOs | Preparing Poplar of commercially viable CO2-EOR Development |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Performance metrics weighted average |
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40.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceMetricsWeightedAveragePercentage / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / mpet_PerformanceMetricsWeightedAverageAxis = mpet_PreparingPoplarofCommerciallyViableCO2EORDevelopmentMember
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PBOs | Progressing UK operations in the Weald Basin |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Performance metrics weighted average |
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20.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceMetricsWeightedAveragePercentage / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / mpet_PerformanceMetricsWeightedAverageAxis = mpet_ProgressingUKOperationsintheWealdBasinMember
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PBOs | Moving forward with Farnham Dome Project |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Performance metrics weighted average |
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20.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceMetricsWeightedAveragePercentage / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / mpet_PerformanceMetricsWeightedAverageAxis = mpet_MovingForwardwithFarnhamDomeProjectMember
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PBOs | CO2-EOR Pilot Program at Poplar |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Performance metrics weighted average |
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10.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceMetricsWeightedAveragePercentage / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / mpet_PerformanceMetricsWeightedAverageAxis = mpet_CO2EORPilotProgramatPoplarMember
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PBOs | Sale of Substantially All of the Amadeus Basin Assets |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Performance metrics weighted average |
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20.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceMetricsWeightedAveragePercentage / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / mpet_PerformanceMetricsWeightedAverageAxis = mpet_SaleofSubstantiallyAlloftheAmadeusBasinAssetsMember
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PBOs | Approval of a Farmout Agreement or Participation in Drilling a Well in the Weald Basin |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Performance metrics weighted average |
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20.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceMetricsWeightedAveragePercentage / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / mpet_PerformanceMetricsWeightedAverageAxis = mpet_ApprovalofaFarmoutAgreementorParticipationinDrillingaWellintheWealdBasinMember
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PBOs | Approval of a Farmout Agreement in the Bonaparte Basin |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Performance metrics weighted average |
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10.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceMetricsWeightedAveragePercentage / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / mpet_PerformanceMetricsWeightedAverageAxis = mpet_ApprovalofaFarmoutAgreementintheBonaparteBasinMember
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Employee Stock Option |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based compensation expense (reversal of expense) |
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(430)us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
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Unrecorded expected future compensation expense related to stock option awards |
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1,424us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
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1,500us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
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RSUs |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Unvested RSUs forfeited |
100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
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Market Based Options |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Per share closing price (in dollars per share) |
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$ 2.35mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardsMinimumPerShareClosingPriceforVesting / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember
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Number of consecutive trading days |
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10mpet_MarketBasedStockOptionsNumberofConsecutiveTradingDays / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember
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Stock issued, in shares |
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400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember
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1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember
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Employee Stock Option |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Maximum number of shares allowed to be issued each year |
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1,000,000mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityOtherthanOptionsMaximumNumberofSharesAllowedtobeIssuedPerPersonPerYear / us-gaap_StatementClassOfStockAxis = us-gaap_EmployeeStockOptionMember
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RSUs |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Maximum number of shares allowed to be issued each year |
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500,000mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityOtherthanOptionsMaximumNumberofSharesAllowedtobeIssuedPerPersonPerYear / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockUnitsRSUMember
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2012 Stock Incentive Plan |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Number of shares authorized |
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5,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = mpet_A2012StockIncentivePlanMember
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Expiration term |
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10 years
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2012 Stock Incentive Plan | TBOs |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock issued, in shares |
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135,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_TimedBasedOptionsMember / us-gaap_PlanNameAxis = mpet_A2012StockIncentivePlanMember
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2012 Stock Incentive Plan | PBOs |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Stock issued, in shares |
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1,250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / us-gaap_PlanNameAxis = mpet_A2012StockIncentivePlanMember
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1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / us-gaap_PlanNameAxis = mpet_A2012StockIncentivePlanMember
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2012 Stock Incentive Plan | Market Based Options |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Per share closing price (in dollars per share) |
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5.00mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardsMinimumPerShareClosingPriceforVesting / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember / us-gaap_PlanNameAxis = mpet_A2012StockIncentivePlanMember
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Number of consecutive trading days |
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10mpet_MarketBasedStockOptionsNumberofConsecutiveTradingDays / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember / us-gaap_PlanNameAxis = mpet_A2012StockIncentivePlanMember
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90mpet_MarketBasedStockOptionsNumberofConsecutiveTradingDays / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember / us-gaap_PlanNameAxis = mpet_A2012StockIncentivePlanMember
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Median stock price (in dollars per share) |
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$ 2.35mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardsMedianStockPriceforVesting / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember / us-gaap_PlanNameAxis = mpet_A2012StockIncentivePlanMember
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5.00mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardsMedianStockPriceforVesting / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember / us-gaap_PlanNameAxis = mpet_A2012StockIncentivePlanMember
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Median stock price, maintenance period |
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90 days
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Stock issued, in shares |
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400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember / us-gaap_PlanNameAxis = mpet_A2012StockIncentivePlanMember
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1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember / us-gaap_PlanNameAxis = mpet_A2012StockIncentivePlanMember
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Vesting period |
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3 years
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1998 Stock Incentive Plan |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Number of shares authorized |
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288,435us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember
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Nonvested options outstanding (in shares) |
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3,131,250us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember
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1998 Stock Incentive Plan | Employee Stock Option |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Market based and performance based shares available for future issuance |
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658,698us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember
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2015 Incentive Compensation Program | Restricted Stock |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based compensation expense (reversal of expense) |
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57us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = mpet_A2015IncentiveCompensationProgramMember
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Former executive | 1998 Stock Incentive Plan |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Number of stock options forfeited/canceled |
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1,512,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
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Value of stock repurchased |
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1,400us-gaap_StockRepurchasedDuringPeriodValue / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
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Repurchase of common stock |
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983us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
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462us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
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Former executive officer ownership, percent, more than |
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5.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
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Amount of withholding taxes |
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318us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
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Shares repurchased during period |
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1,512,500us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
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250,000us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
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Former executive | 1998 Stock Incentive Plan | Employee Stock Option |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Shares repurchased during period |
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1,512,500us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = mpet_A1998StockIncentivePlanMember / us-gaap_TitleOfIndividualAxis = us-gaap_ExecutiveOfficerMember
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Non-employee Directors |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Number of stock options exercised |
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21,875us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_TitleOfIndividualAxis = mpet_NonemployeeDirectorsMember
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Share-based compensation expense (reversal of expense) |
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256us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_TitleOfIndividualAxis = mpet_NonemployeeDirectorsMember
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Non-employee Directors | Common Stock |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Grants in period |
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96,330us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_CommonStockMember / us-gaap_TitleOfIndividualAxis = mpet_NonemployeeDirectorsMember
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Executives | 2015 Incentive Compensation Program | Restricted Stock |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Grants in period |
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100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = mpet_A2015IncentiveCompensationProgramMember / us-gaap_TitleOfIndividualAxis = mpet_ExecutiveOfficersMember
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Chairman of the Board | 2015 Incentive Compensation Program | Restricted Stock |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Grants in period |
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50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = mpet_A2015IncentiveCompensationProgramMember / us-gaap_TitleOfIndividualAxis = us-gaap_BoardOfDirectorsChairmanMember
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Selling, General and Administrative Expense |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based compensation expense (reversal of expense) |
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841us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
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1,667us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
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Selling, General and Administrative Expense | Prior Period Awards |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based compensation expense (reversal of expense) |
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441us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = mpet_PriorPeriodAwardsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
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Selling, General and Administrative Expense | Employee Stock Option |
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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Share-based compensation expense (reversal of expense) |
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$ 561us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
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