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Basis of Presentation (Details Narrative) (USD $)
3 Months Ended 12 Months Ended 5 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Jul. 07, 2014
Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]            
Reverse stock split, description     8-for-1 Reverse Split      
Net loss $ (2,447,320)us-gaap_NetIncomeLoss $ (972,898)us-gaap_NetIncomeLoss $ (7,917,853)us-gaap_NetIncomeLoss $ (4,044,971)us-gaap_NetIncomeLoss    
Net cash used for operating activities     (7,662,019,000)us-gaap_NetCashProvidedByUsedInOperatingActivities      
Net cash provided by investing activities     1,452,476,000us-gaap_NetCashProvidedByUsedInInvestingActivities      
Cash and cash equivalents 4,739,472us-gaap_CashAndCashEquivalentsAtCarryingValue 2,254,675us-gaap_CashAndCashEquivalentsAtCarryingValue 1,477,143us-gaap_CashAndCashEquivalentsAtCarryingValue 354,254us-gaap_CashAndCashEquivalentsAtCarryingValue   421,197,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Accumulated deficit (44,943,783)us-gaap_RetainedEarningsAccumulatedDeficit   (24,550,308)us-gaap_RetainedEarningsAccumulatedDeficit (13,972,552)us-gaap_RetainedEarningsAccumulatedDeficit    
Securities Financing Transactions [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Issuance costs         $ 300,000,000us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= mbvx_SecuritiesFinancingTransactionsMember