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Stockholders' Equity (Preferred Stock) (Detail Textuals) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Dec. 31, 2014
Stockholders' Equity [Abstract]      
Derivative Liability   $ 6.5us-gaap_DerivativeLiabilities  
Amount of loss upon issuance   0.5us-gaap_FairValueOptionChangesInFairValueGainLoss1  
Class of Stock [Line Items]      
Preferred stock, shares authorized   100,000us-gaap_PreferredStockSharesAuthorized 100,000us-gaap_PreferredStockSharesAuthorized
Number of warrants called by common stock aggregate purchase price 6,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights    
Proceeds from sales of Series C preferred shares and warrants, net 6.0us-gaap_ProceedsFromIssuanceOrSaleOfEquity    
Exercise price of warrants   $ 1.19us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.19us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Series A Junior Participating Preferred Stock ("Series A Preferred")      
Class of Stock [Line Items]      
Shares issued during period   90,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
 
Series B Preferred Stock ("Series B Preferred")      
Class of Stock [Line Items]      
Shares issued during period   1,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
 
Series C Convertible Preferred Stock ("Series C Stock")      
Class of Stock [Line Items]      
Preferred stock, shares authorized   1,200us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
 
Shares issued during period 1,200us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
   
Number of warrants called by common stock aggregate purchase price 6,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
   
Conversion price per dollar of stated value $ 0.75mrna_ConversionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
   
Proceeds from sales of Series C preferred shares and warrants, net 6.0us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
   
Stated value per share of preferred stock $ 5,000mrna_StatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
   
Exercise price of warrants $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
   
Shares issued upon conversion 8,000,000us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
   
Stock issuance costs   $ 0.07us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember