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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (USD $)
Redeemable Convertible Preferred Stock Series B
Convertible Preferred Stock Series A-1
Convertible Preferred Stock Series C
Convertible Preferred Stock Series D
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total
Beginning Balance, Amount at Dec. 31, 2014 $ 1,838,025us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemablePreferredStockMember
$ 4,029,576us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesAOneMember
$ 966us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesCMember
   $ 28,029us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 24,492,450us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (24,550,308)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 4,000,713us-gaap_StockholdersEquity
Beginning Balance, Shares at Dec. 31, 2014 1,250,000us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemablePreferredStockMember
1,593,389us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesAOneMember
96,571us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesCMember
   2,802,867us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Conversion of Series A-1 into common stock on January 10 and February 25, 2015, Shares    (64,019)mbvx_ConversionOfSeriesAOneIntoCommonStockOnTenJanuaryAndTwintyFiveFebruaryTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesAOneMember
      38,456mbvx_ConversionOfSeriesAOneIntoCommonStockOnTenJanuaryAndTwintyFiveFebruaryTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Conversion of Series A-1 into common stock on January 10 and February 25, 2015, Amount    (162,968)mbvx_ConversionOfSeriesAOneIntoCommonStockOnTenJanuaryAndTwintyFiveFebruaryTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesAOneMember
      384mbvx_ConversionOfSeriesAOneIntoCommonStockOnTenJanuaryAndTwintyFiveFebruaryTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
162,584mbvx_ConversionOfSeriesAOneIntoCommonStockOnTenJanuaryAndTwintyFiveFebruaryTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Conversion of Series C into common stock on January 10, 2015, Shares       (96,571)mbvx_ConversionOfSeriesCIntoCommonStockOnTenJanuaryTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesCMember
  120,714mbvx_ConversionOfSeriesCIntoCommonStockOnTenJanuaryTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Conversion of Series C into common stock on January 10, 2015, Amount       (966)mbvx_ConversionOfSeriesCIntoCommonStockOnTenJanuaryTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesCMember
  1,207mbvx_ConversionOfSeriesCIntoCommonStockOnTenJanuaryTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(241)mbvx_ConversionOfSeriesCIntoCommonStockOnTenJanuaryTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Conversion of Series B into common stock between March 3 and March 20, 2015, Shares (106,437)mbvx_ConversionOfSeriesBIntoCommonStockBetweenThreeMarchAndTwintyMarchTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemablePreferredStockMember
         276,883mbvx_ConversionOfSeriesBIntoCommonStockBetweenThreeMarchAndTwintyMarchTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Conversion of Series B into common stock between March 3 and March 20, 2015, Amount (160,380)mbvx_ConversionOfSeriesBIntoCommonStockBetweenThreeMarchAndTwintyMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemablePreferredStockMember
         2,769mbvx_ConversionOfSeriesBIntoCommonStockBetweenThreeMarchAndTwintyMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
157,611mbvx_ConversionOfSeriesBIntoCommonStockBetweenThreeMarchAndTwintyMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   160,380mbvx_ConversionOfSeriesBIntoCommonStockBetweenThreeMarchAndTwintyMarchTwoThousandFifteenAmount
Accretion of redemption value for Series A-1 from January 1 to March 25, 2015, Shares                     
Accretion of redemption value for Series A-1 from January 1 to March 25, 2015, Amount    47,749mbvx_AccretionOfRedemptionValueForSeriesAOneFromOneJanuaryToTwintyMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesAOneMember
            (47,749)mbvx_AccretionOfRedemptionValueForSeriesAOneFromOneJanuaryToTwintyMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  
Accretion of redemption value for Series B from January 1 to March 25, 2015, Shares                     
Accretion of redemption value for Series B from January 1 to March 25, 2015, Amount 45,485mbvx_AccretionOfRedemptionValueForSeriesBFromOneJanuaryToTwentyFiveMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemablePreferredStockMember
               (45,485)mbvx_AccretionOfRedemptionValueForSeriesBFromOneJanuaryToTwentyFiveMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(45,485)mbvx_AccretionOfRedemptionValueForSeriesBFromOneJanuaryToTwentyFiveMarchTwoThousandFifteenAmount
Deemed dividend related to exchange of common stock for Series A-1, Series A-1 Warrants and Series B on March 25, 2015, Shares                     
Deemed dividend related to exchange of common stock for Series A-1, Series A-1 Warrants and Series B on March 25, 2015, Amount 8,655,998mbvx_DeemedDividendRelatedToExchangeOfCommonStockForSeriesA1AndSeriesBOnMarch252015Amount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemablePreferredStockMember
9,196,923mbvx_DeemedDividendRelatedToExchangeOfCommonStockForSeriesA1AndSeriesBOnMarch252015Amount
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesAOneMember
            (17,852,921)mbvx_DeemedDividendRelatedToExchangeOfCommonStockForSeriesA1AndSeriesBOnMarch252015Amount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(8,655,998)mbvx_DeemedDividendRelatedToExchangeOfCommonStockForSeriesA1AndSeriesBOnMarch252015Amount
Exchange of Series A-1, and Series A-1 Warrants into common on and Series D on March 25, 2015, Shares    (1,529,370)mbvx_ExchangeOfSeriesAIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesAOneMember
   117,583mbvx_ExchangeOfSeriesAIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesDMember
2,213,407mbvx_ExchangeOfSeriesAIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Exchange of Series A-1, and Series A-1 Warrants into common and Series D on March 25, 2015, Amount    (13,111,280)mbvx_ExchangeOfSeriesAIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesAOneMember
   1,176mbvx_ExchangeOfSeriesAIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesDMember
22,134mbvx_ExchangeOfSeriesAIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
13,087,970mbvx_ExchangeOfSeriesAIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Exchange of Series B into common and Series D on March 25, 2015, Shares (1,143,563)mbvx_ExchangeOfSeriesBIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemablePreferredStockMember
      120,573mbvx_ExchangeOfSeriesBIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesDMember
324,095mbvx_ExchangeOfSeriesBIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Exchange of Series B into common and Series D on March 25, 2015, Amount (10,379,128)mbvx_ExchangeOfSeriesBIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RedeemablePreferredStockMember
      1,206mbvx_ExchangeOfSeriesBIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesDMember
3,241mbvx_ExchangeOfSeriesBIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
10,374,681mbvx_ExchangeOfSeriesBIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   10,379,128mbvx_ExchangeOfSeriesBIntoCommonAndSeriesDOnTwentyFiveMarchTwoThousandFifteenAmount
Private Placement Issuance of 6,661,000 shares at $0.75 per share, net of issuance costs of $281,023 on March 31, 2015, Shares             6,661,000mbvx_PrivatePlacementIssuanceOfSharesAtPerShareNetOfIssuanceCostsOnMarchShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Private Placement Issuance of 6,661,000 shares at $0.75 per share, net of issuance costs of $281,023 on March 31, 2015, Amount             66,610mbvx_PrivatePlacementIssuanceOfSharesAtPerShareNetOfIssuanceCostsOnMarchAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
4,648,116mbvx_PrivatePlacementIssuanceOfSharesAtPerShareNetOfIssuanceCostsOnMarchAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   4,714,726mbvx_PrivatePlacementIssuanceOfSharesAtPerShareNetOfIssuanceCostsOnMarchAmount
Issuance of additional common stock in March 2015 under Common Stock Purchase Agreement in relation to Financing on July 7, 2014, Shares             88,093mbvx_IssuanceOfAdditionalCommonStockInMarchUnderCommonStockPurchaseAgreementInRelationToFinancingOnJulyShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Issuance of additional common stock in March 2015 under Common Stock Purchase Agreement in relation to Financing on July 7, 2014, Amount             881mbvx_IssuanceOfAdditionalCommonStockInMarchUnderCommonStockPurchaseAgreementInRelationToFinancingOnJulyAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(881)mbvx_IssuanceOfAdditionalCommonStockInMarchUnderCommonStockPurchaseAgreementInRelationToFinancingOnJulyAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
     
Elimination of warrant liability in exchange transaction           72,656mbvx_ElimationOfWarrantLiability
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  72,656mbvx_ElimationOfWarrantLiability
Stock-based compensation                82,772us-gaap_ShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   82,772us-gaap_ShareBasedCompensation
Net loss                   (2,447,320)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(2,447,320)us-gaap_NetIncomeLoss
Ending Balance, Amount at Mar. 31, 2015          $ 2,382us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesDMember
$ 125,255us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 53,077,718us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (44,943,783)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 8,261,572us-gaap_StockholdersEquity
Ending Balance, Shares at Mar. 31, 2015          238,156us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= mbvx_ConvertiblePreferredStockSeriesDMember
12,525,515us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember