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Contracts And Agreements (Details Narrative) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Aug. 25, 2014
Jul. 31, 2010
Sep. 30, 2013
Jul. 31, 2012
Agreements [Line Items]                
Contract awarded $ 239,539us-gaap_ContractsRevenue $ 94,900us-gaap_ContractsRevenue            
Revenue from grants 239,539us-gaap_RevenueFromGrants 94,900us-gaap_RevenueFromGrants 304,175us-gaap_RevenueFromGrants 366,368us-gaap_RevenueFromGrants        
Grant Four [Member]                
Agreements [Line Items]                
Revenue from grants     27,182,000,000us-gaap_RevenueFromGrants
/ us-gaap_TypeOfArrangementAxis
= mbvx_GrantFourMember
6,249,200,000us-gaap_RevenueFromGrants
/ us-gaap_TypeOfArrangementAxis
= mbvx_GrantFourMember
       
Phase Two Study [Member] | Grant Four [Member]                
Agreements [Line Items]                
Contract awarded         1,500,000us-gaap_ContractsRevenue
/ us-gaap_StatementScenarioAxis
= mbvx_PhaseTwoStudyMember
/ us-gaap_TypeOfArrangementAxis
= mbvx_GrantFourMember
     
Phase Two Study [Member] | Grant One [Member]                
Agreements [Line Items]                
Contract awarded           182,900,000,000us-gaap_ContractsRevenue
/ us-gaap_StatementScenarioAxis
= mbvx_PhaseTwoStudyMember
/ us-gaap_TypeOfArrangementAxis
= mbvx_GrantOneMember
   
Revenue from grants       20,135,500,000us-gaap_RevenueFromGrants
/ us-gaap_StatementScenarioAxis
= mbvx_PhaseTwoStudyMember
/ us-gaap_TypeOfArrangementAxis
= mbvx_GrantOneMember
       
Phase One And Two Study [Member] | Grant Four [Member]                
Agreements [Line Items]                
Contract awarded         174,900,000,000us-gaap_ContractsRevenue
/ us-gaap_StatementScenarioAxis
= mbvx_PhaseOneAndTwoStudyMember
/ us-gaap_TypeOfArrangementAxis
= mbvx_GrantFourMember
     
Phase One Study [Member] | Grant Four [Member]                
Agreements [Line Items]                
Contract awarded             25,000,000,000us-gaap_ContractsRevenue
/ us-gaap_StatementScenarioAxis
= mbvx_PhaseOneStudyMember
/ us-gaap_TypeOfArrangementAxis
= mbvx_GrantFourMember
 
Phase One Study [Member] | Grant Two [Member]                
Agreements [Line Items]                
Revenue from grants     $ 3,235,500,000us-gaap_RevenueFromGrants
/ us-gaap_StatementScenarioAxis
= mbvx_PhaseOneStudyMember
/ us-gaap_TypeOfArrangementAxis
= mbvx_GrantTwoMember
$ 10,252,100,000us-gaap_RevenueFromGrants
/ us-gaap_StatementScenarioAxis
= mbvx_PhaseOneStudyMember
/ us-gaap_TypeOfArrangementAxis
= mbvx_GrantTwoMember
       
Extension period on project               1 year