Quarterly report pursuant to Section 13 or 15(d)

SUBSEQUENT EVENTS (Details Textual)

v2.4.1.9
SUBSEQUENT EVENTS (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended 0 Months Ended
Mar. 31, 2015
Apr. 30, 2015
Apr. 10, 2015
2015 Private Placement [Member]      
Subsequent Event [Line Items]      
Number Of Units Issued In Offering 20,000,000mtnb_NumberOfUnitsIssuedInOffering
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Warrant To Purchase Common Stock Period 5 years    
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
   
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Proceeds from Issuance of Private Placement $ 10.0us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Subsequent Event [Member] | 2015 Private Placement [Member]      
Subsequent Event [Line Items]      
Number Of Units Issued In Offering   10,125,000mtnb_NumberOfUnitsIssuedInOffering
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
 
Warrant To Purchase Common Stock Period   5 years  
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= mtnb_TwothousandFifteenPrivatePlacementMember
 
Second Closing [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Proceeds from Issuance of Private Placement     $ 5.1us-gaap_ProceedsFromIssuanceOfPrivatePlacement
/ mtnb_PeriodAxis
= mtnb_SecondClosingMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember