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FAIR VALUE ACCOUNTING (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Mar. 31, 2015
Liabilities:    
Shares of common stock required to be issued as part of settlement 319,640mux_LossContingencySettlementSharesRequiredToBeIssued  
Recurring | Total    
Assets:    
Investments 1,082us-gaap_InvestmentsFairValueDisclosure
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$ 1,945us-gaap_InvestmentsFairValueDisclosure
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
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Assets 1,082us-gaap_AssetsFairValueDisclosure
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1,945us-gaap_AssetsFairValueDisclosure
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Liabilities:    
Portion of accounts payable and accrued liabilities recorded at fair value 355us-gaap_AccountsPayableAndAccruedLiabilitiesFairValueDisclosure
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Liabilities 355us-gaap_LiabilitiesFairValueDisclosure
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Recurring | Level 1    
Assets:    
Investments 1,082us-gaap_InvestmentsFairValueDisclosure
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1,945us-gaap_InvestmentsFairValueDisclosure
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Assets 1,082us-gaap_AssetsFairValueDisclosure
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1,945us-gaap_AssetsFairValueDisclosure
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Liabilities:    
Portion of accounts payable and accrued liabilities recorded at fair value 355us-gaap_AccountsPayableAndAccruedLiabilitiesFairValueDisclosure
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Liabilities 355us-gaap_LiabilitiesFairValueDisclosure
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