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Segment Reporting and Geographic Information (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
segment
Mar. 31, 2014
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Number of Business Segments 2us-gaap_NumberOfOperatingSegments    
Revenue $ 38,773us-gaap_SalesRevenueNet $ 42,318us-gaap_SalesRevenueNet  
Network Integration [Member]      
Segment Reporting Information [Line Items]      
Revenue 16,588us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		 20,053us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		  
Network Integration [Member] | Major Customer, One [Member]      
Segment Reporting Information [Line Items]      
Revenue 8,300us-gaap_SalesRevenueNet
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		 11,000us-gaap_SalesRevenueNet
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		  
Network Integration [Member] | Major Customer, Two [Member]      
Segment Reporting Information [Line Items]      
Revenue 4,700us-gaap_SalesRevenueNet
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		 6,500us-gaap_SalesRevenueNet
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		  
Network Integration [Member] | Customer Concentration Risk [Member] | Revenue [Member] | Major Customer, One [Member]      
Segment Reporting Information [Line Items]      
Concentration percentage 21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		 26.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		  
Network Integration [Member] | Customer Concentration Risk [Member] | Revenue [Member] | Major Customer, Two [Member]      
Segment Reporting Information [Line Items]      
Concentration percentage 12.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		 15.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		  
Network Integration [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | Major Customer, One [Member]      
Segment Reporting Information [Line Items]      
Concentration percentage 7.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		   5.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember
Network Integration [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | Major Customer, Two [Member]      
Segment Reporting Information [Line Items]      
Concentration percentage 24.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember		   29.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerTwoMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkIntegrationGroupMember
Network Equipment [Member]      
Segment Reporting Information [Line Items]      
Revenue 22,276us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkEquipmentGroupMember		 22,319us-gaap_SalesRevenueNet
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkEquipmentGroupMember		  
Network Equipment [Member] | Major Customer, One [Member]      
Segment Reporting Information [Line Items]      
Revenue $ 4,400us-gaap_SalesRevenueNet
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkEquipmentGroupMember		 $ 1,400us-gaap_SalesRevenueNet
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkEquipmentGroupMember		  
Network Equipment [Member] | Customer Concentration Risk [Member] | Revenue [Member] | Major Customer, One [Member]      
Segment Reporting Information [Line Items]      
Concentration percentage 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkEquipmentGroupMember		 3.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkEquipmentGroupMember		  
Network Equipment [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | Major Customer, One [Member]      
Segment Reporting Information [Line Items]      
Concentration percentage 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkEquipmentGroupMember		   9.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= mrvc_MajorCustomerOneMember
/ us-gaap_StatementBusinessSegmentsAxis
= mrvc_NetworkEquipmentGroupMember