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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements Of Operations      
Sales $ 27,681,000us-gaap_SalesRevenueNet $ 23,660,000us-gaap_SalesRevenueNet $ 27,671,000us-gaap_SalesRevenueNet
Cost of sales 18,689,000us-gaap_CostOfGoodsAndServicesSold 14,462,000us-gaap_CostOfGoodsAndServicesSold 16,338,000us-gaap_CostOfGoodsAndServicesSold
Gross profit 8,992,000us-gaap_GrossProfit 9,198,000us-gaap_GrossProfit 11,333,000us-gaap_GrossProfit
Other costs and expenses:      
Research and development 1,416,000us-gaap_ResearchAndDevelopmentExpense 1,260,000us-gaap_ResearchAndDevelopmentExpense 1,329,000us-gaap_ResearchAndDevelopmentExpense
Professional services 1,016,000us-gaap_ProfessionalFees 1,835,000us-gaap_ProfessionalFees 1,439,000us-gaap_ProfessionalFees
Salaries and related costs 5,723,000us-gaap_SalariesAndWages 3,992,000us-gaap_SalariesAndWages 3,178,000us-gaap_SalariesAndWages
Selling, general and administrative 6,686,000us-gaap_SellingGeneralAndAdministrativeExpense 5,777,000us-gaap_SellingGeneralAndAdministrativeExpense 4,341,000us-gaap_SellingGeneralAndAdministrativeExpense
Total other costs and expenses 14,841,000us-gaap_OtherCostAndExpenseOperating 12,864,000us-gaap_OtherCostAndExpenseOperating 10,287,000us-gaap_OtherCostAndExpenseOperating
Income/(loss) from operations (5,849,000)us-gaap_OperatingIncomeLoss (3,666,000)us-gaap_OperatingIncomeLoss 1,046,000us-gaap_OperatingIncomeLoss
Interest expense, net (151,000)us-gaap_InterestIncomeExpenseNet (237,000)us-gaap_InterestIncomeExpenseNet (232,000)us-gaap_InterestIncomeExpenseNet
Investor warrants issuance cost    (664,000)BVX_InvestorWarrantsIssuanceCost   
Fees associated with refinance    (543,000)us-gaap_FeesAndCommissionsTransferAgent   
Change in fair value of liabilities, net (7,285,000)us-gaap_UnrealizedGainLossOnDerivatives (842,000)us-gaap_UnrealizedGainLossOnDerivatives 20,000us-gaap_UnrealizedGainLossOnDerivatives
Total other (expense), net (7,436,000)us-gaap_OtherNonoperatingExpense (2,286,000)us-gaap_OtherNonoperatingExpense (212,000)us-gaap_OtherNonoperatingExpense
Income/(loss) before income taxes (13,285,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (5,952,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 834,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Benefit (provision) for deferred income taxes, net (3,997,000)us-gaap_IncomeTaxExpenseBenefit 1,613,000us-gaap_IncomeTaxExpenseBenefit (217,000)us-gaap_IncomeTaxExpenseBenefit
Net income (loss) (17,282,000)us-gaap_NetIncomeLoss (4,339,000)us-gaap_NetIncomeLoss 617,000us-gaap_NetIncomeLoss
Accretion on convertible preferred stock (932,000)BVX_AccretionOnConvertiblePreferredStock (39,000)BVX_AccretionOnConvertiblePreferredStock  
Deemed dividend on beneficial conversion feature    (2,616,000)BVX_DeemedDividendOnBeneficialConversionFeature   
Net income (loss) attributable to common shareholders $ (18,214,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (6,994,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 617,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Income (loss) per share      
Basic $ (1.03)us-gaap_EarningsPerShareBasic $ (0.40)us-gaap_EarningsPerShareBasic $ 0.04us-gaap_EarningsPerShareBasic
Diluted $ (1.03)us-gaap_EarningsPerShareDiluted $ (0.40)us-gaap_EarningsPerShareDiluted $ 0.03us-gaap_EarningsPerShareDiluted
Weighted average number of shares outstanding- basic 17,756us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 17,670us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 17,631us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average number of shares outstanding - dilutive 17,756us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 17,670us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 17,787us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding