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Related Party Transactions - Additional Information (Detail) (USD $)
1 Months Ended 12 Months Ended
Feb. 28, 2014
Dec. 31, 2013
Dec. 31, 2014
Related Party Transactions [Abstract]      
Consulting fee   $ 240,000us-gaap_ProfessionalFees  
Related party liabilities 240,000us-gaap_DueToRelatedPartiesCurrent 240,000us-gaap_DueToRelatedPartiesCurrent  
Shares of common stock in exchange for cancellation of related party liabilities 44,000mbvx_IssuanceOfCommonStockToRelatedPartiesForConsultingServicesShares    
Severance and benefits costs 748,000us-gaap_SeveranceCosts1    
Accrued severance and benefits costs     $ 6,000us-gaap_RestructuringReserve