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Cash and Cash Equivalents and Restricted Time Deposits (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 14,215us-gaap_CashAndCashEquivalentsAtCarryingValue $ 22,422us-gaap_CashAndCashEquivalentsAtCarryingValue $ 23,214us-gaap_CashAndCashEquivalentsAtCarryingValue $ 27,591us-gaap_CashAndCashEquivalentsAtCarryingValue
United States [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 5,200us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= country_US		 13,300us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= country_US		    
Foreign [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 9,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= mrvc_ForeignMember		 $ 9,100us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= mrvc_ForeignMember