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Subsequent Event (Details) (DR Systems, Inc. (DRS) [Member], USD $)
In Thousands, unless otherwise specified
Feb. 25, 2015
Apr. 17, 2015
Subsequent Event [Line Items]    
Remaining percentage of common stock acquired (in hundredths) 8.50%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners  
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Remaining percentage of common stock acquired (in hundredths)   8.50%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_BusinessAcquisitionAxis
= mrge_DRSystemsIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Remaining purchase price of common stock acquired   $ 7,104us-gaap_RedeemableNoncontrollingInterestEquityFairValue
/ us-gaap_BusinessAcquisitionAxis
= mrge_DRSystemsIncMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember