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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	$ 500,000us-gaap_OperatingLeasesRentExpenseNet	$ 800,000us-gaap_OperatingLeasesRentExpenseNet	$ 700,000us-gaap_OperatingLeasesRentExpenseNet
Outstanding surety bonds	4,800,000mux_OutstandingSuretyBonds	0mux_OutstandingSuretyBonds		4,800,000mux_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	500,000mux_SuretyBondsUpfrontDepositAmount
Lease Obligations
2015	928,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
2016	543,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
2017	464,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
2018	466,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
2019	472,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Purchase Commitments
2015	17,000us-gaap_PurchaseObligationDueInNextTwelveMonths
Total
2015	945,000us-gaap_ContractualObligationDueInNextTwelveMonths
2016	543,000us-gaap_ContractualObligationDueInSecondYear
2017	464,000us-gaap_ContractualObligationDueInThirdYear
2018	466,000us-gaap_ContractualObligationDueInFourthYear
2019	$ 472,000us-gaap_ContractualObligationDueInFifthYear

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Amount of contractual obligation maturing in the fifth fiscal year following the latest fiscal year.

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