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Reverse Stock Split, Name Change and Increase in Authorized Shares (Details Narrative)
Mar. 31, 2015
Dec. 31, 2014
Sep. 08, 2014
Dec. 31, 2013
Temporary Equity [Line Items]        
Common stock, shares authorized 150,000,000us-gaap_CommonStockSharesAuthorized 150,000,000us-gaap_CommonStockSharesAuthorized 150,000,000us-gaap_CommonStockSharesAuthorized 150,000,000us-gaap_CommonStockSharesAuthorized
Preferred stock, shares authorized     15,000,000us-gaap_PreferredStockSharesAuthorized  
Number of outstanding shares 12,525,515us-gaap_CommonStockSharesOutstanding 2,802,867us-gaap_CommonStockSharesOutstanding   230,503us-gaap_CommonStockSharesOutstanding
Series C Convertible Preferred Stock [Member]        
Temporary Equity [Line Items]        
Preferred stock, shares authorized   200,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= mbvx_SeriesCConvertiblePreferredStockMember		    
Series A-1 Convertible Preferred Stock [Member]        
Temporary Equity [Line Items]        
Preferred stock, shares authorized   2,763,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= mbvx_SeriesA1ConvertiblePreferredStockMember		    
Pre Stock Split [Member]        
Temporary Equity [Line Items]        
Number of outstanding shares     13,932,937us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= mbvx_PreStockSplitMember		  
Post Stock Split [Member]        
Temporary Equity [Line Items]        
Number of outstanding shares     1,741,617us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= mbvx_PostStockSplitMember