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Accrued Expenses (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended
Sep. 30, 2014
Apr. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Accrued Expenses        
Investor deposit       $ 500mrns_InvestorDepositCurrent
Payroll and related costs     419us-gaap_EmployeeRelatedLiabilitiesCurrent 204us-gaap_EmployeeRelatedLiabilitiesCurrent
Clinical trials and drug development     777mrns_ClinicalTrialsAndDrugDevelopmentCurrent 73mrns_ClinicalTrialsAndDrugDevelopmentCurrent
Professional fees     186us-gaap_AccruedProfessionalFeesCurrent 295us-gaap_AccruedProfessionalFeesCurrent
Other     121us-gaap_OtherAccruedLiabilitiesCurrent 24us-gaap_OtherAccruedLiabilitiesCurrent
Accrued expenses     $ 1,503us-gaap_AccruedLiabilitiesCurrent $ 1,096us-gaap_AccruedLiabilitiesCurrent
Accrued expenses        
Shares issued 5,758,000us-gaap_StockIssuedDuringPeriodSharesNewIssues      
Series C Preferred Stock        
Accrued expenses        
Shares issued   422,119us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= mrns_SeriesCConvertiblePreferredStockMember