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RENTAL EXPENSE, COMMITMENTS AND CONTINGENCIES (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014
RENTAL EXPENSE, COMMITMENTS AND CONTINGENCIES |  |  |  |
Rental expense | $ 500,000 us-gaap_OperatingLeasesRentExpenseNet | $ 800,000 us-gaap_OperatingLeasesRentExpenseNet | $ 700,000 us-gaap_OperatingLeasesRentExpenseNet |
Outstanding surety bonds | 4,800,000 mux_OutstandingSuretyBonds | 0 mux_OutstandingSuretyBonds |  | 4,800,000 mux_OutstandingSuretyBonds
Percentage of annual fees on surety bonds | 1.50%mux_SuretyBondsAnnualFeesPercentage |  |  |
Percentage of upfront deposit on surety bonds | 10.00%mux_SuretyBondsUpfrontDepositPercentage |  |  |
Surety bonds upfront deposit amount | 500,000 mux_SuretyBondsUpfrontDepositAmount |  |  |
Lease Obligations |  |  |  |
2015 | 928,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent |  |  |
2016 | 543,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears |  |  |
2017 | 464,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears |  |  |
2018 | 466,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears |  |  |
2019 | 472,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears |  |  |
Purchase Commitments |  |  |  |
2015 | 17,000 us-gaap_PurchaseObligationDueInNextTwelveMonths |  |  |
Total |  |  |  |
2015 | 945,000 us-gaap_ContractualObligationDueInNextTwelveMonths |  |  |
2016 | 543,000 us-gaap_ContractualObligationDueInSecondYear |  |  |
2017 | 464,000 us-gaap_ContractualObligationDueInThirdYear |  |  |
2018 | 466,000 us-gaap_ContractualObligationDueInFourthYear |  |  |
2019 | $ 472,000 us-gaap_ContractualObligationDueInFifthYear |  |  |

X
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- Definition Represents the percentage of annual fees on the value of the surety bonds. + References No definition available. + Details
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- Definition Represents the amount of upfront deposit on the value of surety bonds. + References No definition available. + Details
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- Definition Represents the percentage of upfront deposit on the value of the surety bonds. + References No definition available. + Details
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- Definition Amount of contractual obligation maturing in the fifth fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Amount of contractual obligation maturing in the next fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Amount of contractual obligation maturing in the second fiscal year following the latest fiscal year. + References No definition available. + Details
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- Definition Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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