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Commitments and Contingencies (Details Narrative) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2015
Operating Leased Assets [Line Items]      
Contingent lease termination fee $ 590,504mbvx_AccruedContingentLeaseTerminationFee   $ 590,504mbvx_AccruedContingentLeaseTerminationFee
Lease amendment date Aug. 01, 2010    
Lease expiration date Jul. 31, 2015    
Refundable security deposit 11,017us-gaap_DepositsAssetsNoncurrent    
Rent expense 115,118us-gaap_OperatingLeasesRentExpenseNet 138,783us-gaap_OperatingLeasesRentExpenseNet  
Severance and benefits costs to be paid 6,000us-gaap_RestructuringReserve    
Porter Drive [Member]      
Operating Leased Assets [Line Items]      
Contingent lease termination fee 590,504mbvx_AccruedContingentLeaseTerminationFee
/ us-gaap_PartiesToContractualArrangementAxis
= mbvx_PorterDriveMember
   
Additional financing amount $ 15mbvx_AmountOfAdditionalFinancingToTriggerAdditionalTerminationFee
/ us-gaap_PartiesToContractualArrangementAxis
= mbvx_PorterDriveMember