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Stock-based Activity (Details Narrative 2) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 14, 2013
Jun. 30, 2014
Nov. 30, 2012
Sep. 30, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock Options granted    90,876us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 93,378us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross        
Unrecognized stock-based compensation expense, options $ 667,633us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions $ 75,040,500us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions          
Unrecognized stock-based compensation expense, recognition period 2 years 4 months 24 days 2 years 6 months          
Weighted average remaining Contractual term, stock options outstanding 7 years 8 months 12 days 7 years 10 months 24 days          
Tax benefits for tax deductions related to stock-based compensation   $ 0us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense          
Stock options exercised    0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised        
Two Thousand Eight Stock Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized under the Stock Plan           155,893us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= mbvx_TwoThousandEightStockIncentivePlanMember
65,507us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= mbvx_TwoThousandEightStockIncentivePlanMember
Stock Options granted       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= mbvx_TwoThousandEightStockIncentivePlanMember
     
Two Thousand Fourteen Stock Incentive Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Issuance of shares contingent upon forfeiture, expiration or cancellation         152,017mbvx_ShareBasedCompensationArrangementByShareBasedPaymentAwardContingentUponForfeitureExpirationOrCancellation
/ us-gaap_AwardTypeAxis
= mbvx_TwoThousandFourteenStockIncentivePlanMember
   
Employee option grants vest percentage on first anniversary   3 years          
Description of share based award   The maximum term of options granted under the Stock Plan is ten years. Employee option grants will generally vest 25% on the first anniversary of the original vesting date, and the balance vests monthly over the next three years.          
Two Thousand Fourteen Stock Incentive Plan [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock issued during period new issue of shares         351,443us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= mbvx_TwoThousandFourteenStockIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Maximum term of options granted under Stock Plan   10 years          
Employee Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options vested, number of shares   0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
         
Stock option vesting period   4 years          
Employee Stock Option [Member] | Board [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock Options granted   55,580us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= mbvx_BoardMember