Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation (Details Textual)

v2.4.1.9
Stock Based Compensation (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock, Capital Shares Reserved for Future Issuance       8,250,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 9 years 1 month 6 days 9 years 8 months 12 days 0 years  
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum 4.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum      
Common Stock, Shares, Issued 32,292,650us-gaap_CommonStockSharesIssued 32,000,000us-gaap_CommonStockSharesIssued    
Share-based Compensation, Total $ 1,974,153us-gaap_ShareBasedCompensation $ 325,740us-gaap_ShareBasedCompensation    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years      
Share-based Compensation Arrangement by Share-based Payment Award, Description granted at prices not less than 100% of the fair value      
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee Service Share Based Compensation Total Compensation Cost Not Yet Recognized Stock Options Grants 1,900,000mtnb_EmployeeServiceShareBasedCompensationTotalCompensationCostNotYetRecognizedStockOptionsGrants
/ us-gaap_OptionIndexedToIssuersEquityTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 2 years      
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 10 years      
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 616,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
     
Consultant [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years      
Consultant [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years      
Board of Directors Chairman [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock, Shares, Issued 292,650us-gaap_CommonStockSharesIssued
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_BoardOfDirectorsChairmanMember
     
Share-based Compensation, Total 211,300us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_BoardOfDirectorsChairmanMember
     
Clinical Milestones [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 71,750us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
/ us-gaap_TitleOfIndividualAxis
= mtnb_ClinicalMilestonesMember
     
Share-based Compensation, Total $ 28,000us-gaap_ShareBasedCompensation
/ us-gaap_TitleOfIndividualAxis
= mtnb_ClinicalMilestonesMember