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Commitments and Contingencies (Operating Leases - Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Leased Assets [Line Items]      
Operating leases, rental expense $ 2,500,000us-gaap_LeaseAndRentalExpense $ 2,400,000us-gaap_LeaseAndRentalExpense $ 2,700,000us-gaap_LeaseAndRentalExpense
Total lease payments over the lease term 5,932,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Bud H. Harris [Member]      
Operating Leased Assets [Line Items]      
Operating lease, term 10 years    
Total lease payments over the lease term 500,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PartiesToContractualArrangementAxis
= mrvc_BudHHarrisMember
   
Operating lease, improvement allowance 70,000mrvc_LesseeLeasingArrangementsOperatingLeasesImprovementAllowanceAmount
/ us-gaap_PartiesToContractualArrangementAxis
= mrvc_BudHHarrisMember
   
George DiRado [Member]      
Operating Leased Assets [Line Items]      
Operating lease, renewal term 5 years    
Total lease payments over the lease term 200,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PartiesToContractualArrangementAxis
= mrvc_GeorgeDiradoMember
   
Tecla Immobillare [Member]      
Operating Leased Assets [Line Items]      
Total lease payments over the lease term 1,200,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PartiesToContractualArrangementAxis
= mrvc_TeclaImmobillareMember
   
Fanocle S.p.A. [Member]      
Operating Leased Assets [Line Items]      
Total lease payments over the lease term 1,100,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PartiesToContractualArrangementAxis
= mrvc_FanocleSPAMember
   
Chelmsford Associates, LLC [Member]      
Operating Leased Assets [Line Items]      
Operating lease, term 5 years 6 months    
Operating lease, renewal term 5 years    
Total lease payments over the lease term 200,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PartiesToContractualArrangementAxis
= mrvc_ChelmsfordAssociatesLlcMember
   
Operating lease, rent abatement $ 146,000mrvc_LesseeLeasingArrangementsOperatingLeasesRentAbatementAmount
/ us-gaap_PartiesToContractualArrangementAxis
= mrvc_ChelmsfordAssociatesLlcMember