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Fair Value Measurement (Narrative) (Details) (USD $)
0 Months Ended 1 Months Ended 3 Months Ended
Apr. 08, 2013
Nov. 30, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Feb. 18, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Stipulation of settlement, payment to plaintiff, warrants 250,000mrvc_StipulationOfSettlementProvisionPaymentAmountWarrants         250,000mrvc_StipulationOfSettlementProvisionPaymentAmountWarrants
Expected volatility rate       41.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate    
Risk free interest rate       1.50%us-gaap_FairValueAssumptionsRiskFreeInterestRate    
Stipulation of settlement, payment to plaintiff, warrants, term 5 years     5 years    
Warrants, fair value per share     6.59mrvc_ClassofWarrantorRightFairValuePerUnit      
Liabilities, fair value adjustment       $ 400,000us-gaap_LiabilitiesFairValueAdjustment    
Number of warrants exercised   152,500mrvc_ClassofWarrantorRightNumberofWarrantsExercised 0mrvc_ClassofWarrantorRightNumberofWarrantsExercised      
Number of warrants outstanding         97,500us-gaap_ClassOfWarrantOrRightOutstanding  
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash Equivalents     $ 2,807,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
  10,606,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member