Quarterly report pursuant to Section 13 or 15(d)

STOCK BASED COMPENSATION (Details 1)

v2.4.1.9
STOCK BASED COMPENSATION (Details 1) (2013 Equity Compensation Plan [Member])
3 Months Ended
Mar. 31, 2015
2013 Equity Compensation Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Reserved for Issuance 9,541,706us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= mtnb_TwoThousandThirteenEquityCompensationPlanMember
Awards Issued 7,130,650us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= mtnb_TwoThousandThirteenEquityCompensationPlanMember
[1]
Awards Available for Grant 2,411,056us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= mtnb_TwoThousandThirteenEquityCompensationPlanMember
[1] includes both stock grants and option grants