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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Stockholders' equity:    
Series A 6% convertible preferred stock, par value $ 0.001BVX_SeriesAConvertiblePreferredStockParValue  
Series A 6% convertible preferred stock, shares authorized 3,500,000BVX_SeriesAConvertiblePreferredStockSharesAuthorized  
Series A 6% convertible preferred stock, shares issued 0BVX_SeriesAConvertiblePreferredStockSharesIssued  
Series B convertible preferred stock, par value $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare  
Series B convertible preferred stock, shares issued 3,588,139us-gaap_PreferredStockSharesIssued  
Series B convertible preferred stock, shares outstanding 3,588,139us-gaap_PreferredStockSharesOutstanding  
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 40,000,000us-gaap_CommonStockSharesAuthorized 40,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 23,335,894us-gaap_CommonStockSharesIssued 17,995,409us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 23,192,815us-gaap_CommonStockSharesOutstanding 17,852,330us-gaap_CommonStockSharesOutstanding