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Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Valuation Allowance [Line Items]      
Change in valuation allowance $ 5,600,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ (4,800,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ (20,600,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, net 2,640,000us-gaap_DeferredTaxAssetsLiabilitiesNet 4,913,000us-gaap_DeferredTaxAssetsLiabilitiesNet  
Capital loss carry forwards 38,755,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 38,951,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards  
NOL carry forwards, federal 179,700,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic    
NOL carry forwards, state 100,700,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal    
NOL carry forwards, foreign 97,300,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign    
NOL carry forwards increase, federal 7,400,000mrvc_DeferredTaxAssetOperatingLossCarryforwardsIncreaseDecreaseDomestic    
NOL carry forwards increase, state 7,900,000mrvc_DeferredTaxAssetOperatingLossCarryforwardsIncreaseDecreaseStateAndLocal    
Loss carryovers from share-based compensation 3,200,000mrvc_ShareBasedCompensationLossCarryforwards    
Undistributed earnings at foreign entities 27,600,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Reclassification of income tax benefit from discontinued operations to continuing operations     3,600,000mrvc_IncomeTaxExepenseReclassificationBetweenDiscontinuedOperationsAndContinuingOperationsAmount
Income tax netted from Income from Discontinued Operations     4,588,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Foreign Tax Authority [Member] | Israel Tax Authority [Member]      
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, net 2,640,000us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ mrvc_IncomeTaxAuthorityNameAxis
= mrvc_IsraelTaxAuthorityMember		    
Foreign Tax Authority [Member] | Israel Tax Authority and Federal Ministry of Finance, Germany [Member]      
Operating Loss Carryforwards [Line Items]      
Deferred tax assets, net   4,913,000us-gaap_DeferredTaxAssetsLiabilitiesNet
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ mrvc_IncomeTaxAuthorityNameAxis
= mrvc_IsraelTaxAuthorityandFederalMinistryofFinanceGermanyMember		  
Federal [Member]      
Operating Loss Carryforwards [Line Items]      
Capital loss carry forwards 110,500,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
State [Member]      
Operating Loss Carryforwards [Line Items]      
Capital loss carry forwards 24,000,000us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Current Year Operating Loss Carryforwards, Domestic [Member]      
Valuation Allowance [Line Items]      
Change in valuation allowance 2,600,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= mrvc_CurrentYearOperatingLossCarryforwardsDomesticMember		    
Current Year Operating Loss Carryforwards, Foreign [Member]      
Valuation Allowance [Line Items]      
Change in valuation allowance 1,100,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= mrvc_CurrentYearOperatingLossCarryforwardsForeignMember		    
Prior Year Operating Loss Carryforwards, Foreign [Member]      
Valuation Allowance [Line Items]      
Change in valuation allowance $ 1,900,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= mrvc_PriorYearOperatingLossCarryforwardsForeignMember