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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Stockholders' equity:    
Series A 6% convertible preferred stock, par value $ 0.001BVX_SeriesAConvertiblePreferredStockParValue $ 0.001BVX_SeriesAConvertiblePreferredStockParValue
Series A 6% convertible preferred stock, shares authorized 3,500,000BVX_SeriesAConvertiblePreferredStockSharesAuthorized 3,500,000BVX_SeriesAConvertiblePreferredStockSharesAuthorized
Series A 6% convertible preferred stock, shares issued 3,500,000BVX_SeriesAConvertiblePreferredStockSharesIssued 3,500,000BVX_SeriesAConvertiblePreferredStockSharesIssued
Series A 6% convertible preferred stock, preference in liquidation $ 7,442,260BVX_SeriesAConvertiblePreferredStockPreferenceInLiquidation $ 7,442,260BVX_SeriesAConvertiblePreferredStockPreferenceInLiquidation
Preferred stock, par value $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized
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 17,995,409us-gaap_CommonStockSharesIssued 17,826,336us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 17,852,330us-gaap_CommonStockSharesOutstanding 17,683,257us-gaap_CommonStockSharesOutstanding