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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accrued Expenses    
Payroll and related costs $ 286us-gaap_EmployeeRelatedLiabilitiesCurrent $ 419us-gaap_EmployeeRelatedLiabilitiesCurrent
Clinical trials and drug development 894mrns_ClinicalTrialsAndDrugDevelopmentCurrent 777mrns_ClinicalTrialsAndDrugDevelopmentCurrent
Professional fees 143us-gaap_AccruedProfessionalFeesCurrent 186us-gaap_AccruedProfessionalFeesCurrent
Other 193us-gaap_OtherAccruedLiabilitiesCurrent 121us-gaap_OtherAccruedLiabilitiesCurrent
Accrued expenses $ 1,516us-gaap_AccruedLiabilitiesCurrent $ 1,503us-gaap_AccruedLiabilitiesCurrent