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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (unaudited) (USD $)
In Thousands, except Share data
Preferred Stock
Common Stock
Additional Paid-In Capital
Deficit
Total
Beginning Balance, Amount at Dec. 31, 2014    $ 18us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 29,334us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (27,848)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ 1,504us-gaap_StockholdersEquity
Beginning Balance, Shares at Dec. 31, 2014    17,854us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Options exercised, Shares    5us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Options exercised, Amount       11us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    11us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Warrants exercised, Shares    198BVX_WarrantsExercisedShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Warrants exercised, Amount       438BVX_WarrantsExercisedAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    438BVX_WarrantsExercisedAmount
Issuance of common stock, Shares    5,219us-gaap_StockIssuedDuringPeriodSharesIssuedForCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Issuance of common stock, Amount    5us-gaap_StockIssuedDuringPeriodValueIssuedForCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 11,526us-gaap_StockIssuedDuringPeriodValueIssuedForCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    11,531us-gaap_StockIssuedDuringPeriodValueIssuedForCash
Conversion of Series A preferred stock and common warrants to Series B preferred stock, Shares 3,588BVX_ConversionOfSeriesPreferredStockAndCommonWarrantsToSeriesBPreferredStockShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		         
Conversion of Series A preferred stock and common warrants to Series B preferred stock, Amount 4BVX_ConversionOfSeriesPreferredStockAndCommonWarrantsToSeriesBPreferredStockAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		       13,956BVX_ConversionOfSeriesPreferredStockAndCommonWarrantsToSeriesBPreferredStockAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 13,960BVX_ConversionOfSeriesPreferredStockAndCommonWarrantsToSeriesBPreferredStockAmount
Stock based compensation       119us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    119us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Stock swap to acquire options, Shares    (81)BVX_StockSwapToAcquireOptionsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Stock swap to acquire options, Amount       (273)BVX_StockSwapToAcquireOptionsAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		    (273)BVX_StockSwapToAcquireOptionsAmount
Accretion on convertible preferred stock          (222)BVX_AccretionOnConvertiblePreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (222)BVX_AccretionOnConvertiblePreferredStock
Net income (loss)          (876)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (876)us-gaap_NetIncomeLoss
Ending Balance, Amount at Mar. 31, 2015 $ 4us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 $ 23us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 41,155us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ (14,990)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ 26,192us-gaap_StockholdersEquity
Ending Balance, Shares at Mar. 31, 2015 3,588us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember		 23,195us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember