|
Stock-Based Compensation (Weighted Average Assumptions) (Details) (USD $)
|
6 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Number of options | 1,650,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | |
| PBOs | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Number of options |
1,250,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember |
1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember |
| Weighted-average grant date fair value per share |
$ 0.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember |
$ 0.57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember |
| Expected dividend yield |
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember |
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember |
| Forfeiture rate |
15.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsForfeitureRate / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember |
0.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsForfeitureRate / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember |
| Risk free interest rate |
1.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember |
|
| PBOs | Minimum | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Risk free interest rate |
1.50%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
|
| Expected life (years) | 5 years 3 months 18 days | 4 months 24 days |
| Expected volatility (based on historical price) |
53.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
61.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
| PBOs | Maximum | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Risk free interest rate |
1.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
|
| Expected life (years) | 5 years 4 months 24 days | 1 year 7 months 6 days |
| Expected volatility (based on historical price) |
54.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
61.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = mpet_PerformanceBasedOptionsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
| Market Based | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Number of options |
400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
| Weighted-average grant date fair value per share |
$ 1.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
$ 0.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
| Expected dividend yield |
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
| Forfeiture rate |
15.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsForfeitureRate / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
0.00%mpet_SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsForfeitureRate / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
| Risk free interest rate |
2.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
2.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
| Expected life (years) | 2 years 7 months 6 days | |
| Expected volatility (based on historical price) |
64.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
66.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = mpet_StockOptionsMarketBasedMember |
| Market Based | Minimum | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected life (years) | 3 years 2 months 12 days | |
| Market Based | Maximum | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected life (years) | 3 years 10 months 24 days | |
| X | ||||||||||
|
- Definition
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Forfeiture Rate No definition available.
|
| X | ||||||||||
|
- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Gross number of share options (or share units) granted during the period. No definition available.
|
| X | ||||||||||
|
- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Details
|