Quarterly report pursuant to Section 13 or 15(d)

2015 Private Placement Funding (Details Textual)

v2.4.1.9
2015 Private Placement Funding (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Private Placement Funding [Line Items]      
Common Stock, Par or Stated Value Per Share $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare   $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Effectiveness Of Registration Statement Description If the Registration Statement is not filed on or before the Filing Deadline or not declared effective on or before the Effectiveness Deadline, the Company shall pay to each holder of registerable securities purchased in the 2015 Private Placement an amount in cash equal to one-half of one percent (0.5%) of such holders investment amount on every thirty (30) day anniversary of such Filing Deadline or Effectiveness Deadline failure until such failure is cured. The payment amount shall be prorated for partial thirty (30) day periods. The maximum aggregate amount of payments to be made by the Company as the result of such failures, whether by reason of a Filing Deadline failure, Effectiveness Deadline failure or any combination thereof, shall be an amount equal to 6% of each holders investment amount.    
Proceeds from Issuance of Common Stock $ 4,937,500us-gaap_ProceedsFromIssuanceOfCommonStock $ 0us-gaap_ProceedsFromIssuanceOfCommonStock  
Proceeds from Issuance of Common Stock, Net 4,282,734mtnb_ProceedsFromIssuanceOfCommonStockNet    
Warrant [Member]      
Private Placement Funding [Line Items]      
Number Of Units Issued In Offering 20,000,000mtnb_NumberOfUnitsIssuedInOffering
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
   
Minimum [Member]      
Private Placement Funding [Line Items]      
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
2015 Private Placement [Member]      
Private Placement Funding [Line Items]      
Share Price $ 0.50us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Common Stock, Par or Stated Value Per Share $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Warrant To Purchase Common Stock Period 5 years    
Number Of Units Issued In Offering 20,000,000mtnb_NumberOfUnitsIssuedInOffering
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Payments for Repurchase of Common Stock 10,000,000us-gaap_PaymentsForRepurchaseOfCommonStock
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Deferred Offering Costs 8,500,000us-gaap_DeferredOfferingCosts
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Placement Agent Fees 1,000,000mtnb_PlacementAgentFees
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Non Accountable Expense Allowance $ 300,000mtnb_NonAccountableExpenseAllowance
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Warrant Solicitation Fee Percentage 5.00%mtnb_WarrantSolicitationFeePercentage
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
2015 Private Placement [Member] | Exercise Price One [Member]      
Private Placement Funding [Line Items]      
Warrants Issued For Purchase Of Common Stock 2,000,000mtnb_WarrantsIsuuedForPurchaseOfCommonStock
/ mtnb_ExercisePriceAxis
= mtnb_ExercisePriceOneMember
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Investment Warrants, Exercise Price $ 0.50invest_InvestmentWarrantsExercisePrice
/ mtnb_ExercisePriceAxis
= mtnb_ExercisePriceOneMember
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
2015 Private Placement [Member] | Exercise Price Two [Member]      
Private Placement Funding [Line Items]      
Warrants Issued For Purchase Of Common Stock 2,000,000mtnb_WarrantsIsuuedForPurchaseOfCommonStock
/ mtnb_ExercisePriceAxis
= mtnb_ExercisePriceTwoMember
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Investment Warrants, Exercise Price $ 0.75invest_InvestmentWarrantsExercisePrice
/ mtnb_ExercisePriceAxis
= mtnb_ExercisePriceTwoMember
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
2015 Private Placement [Member] | Minimum [Member]      
Private Placement Funding [Line Items]      
Closing Bid Price Of Common Stock $ 3.00mtnb_ClosingBidPriceOfCommonStock
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember