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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, except Share data
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total
Beginning Balance, Amount at Dec. 31, 2011 $ 18us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 25,356us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (3,257)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 22,117us-gaap_StockholdersEquity
Beginning Balance, Shares at Dec. 31, 2011 17,618us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Options exercised, Shares 28us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Options exercised, Amount    20us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   20us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock based compensation    161us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   161us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Stock swap to acquire options, Shares (7)BVX_StockSwapToAcquireOptionsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Stock swap to acquire options, Amount    (20)BVX_StockSwapToAcquireOptionsAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   (20)BVX_StockSwapToAcquireOptionsAmount
Net income (loss)       617us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
617us-gaap_NetIncomeLoss
Ending Balance, Amount at Dec. 31, 2012 18us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
25,517us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(2,640)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
22,895us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2012 17,639us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Options exercised, Shares 51us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Options exercised, Amount    70us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   70us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock based compensation    506us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   506us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Stock swap to acquire options, Shares (6)BVX_StockSwapToAcquireOptionsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Stock swap to acquire options, Amount    (22)BVX_StockSwapToAcquireOptionsAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   (22)BVX_StockSwapToAcquireOptionsAmount
Convertible preferred stock - beneficial conversion feature    2,616BVX_ConvertiblePreferredStockBeneficialConversionFeature
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   2,616BVX_ConvertiblePreferredStockBeneficialConversionFeature
Deemed dividend on convertible preferred stock       (2,616)BVX_DeemedDividendOnConvertiblePreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(2,616)BVX_DeemedDividendOnConvertiblePreferredStock
Accretion on convertible preferred stock       (39)BVX_AccretionOnConvertiblePreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(39)BVX_AccretionOnConvertiblePreferredStock
Net income (loss)       (4,339)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(4,339)us-gaap_NetIncomeLoss
Ending Balance, Amount at Dec. 31, 2013 18us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
28,687us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(9,634)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
19,071us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2013 17,684us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Options exercised, Shares 221us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Options exercised, Amount    469us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   469us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock based compensation    388us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   388us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Stock swap to acquire options, Shares (51)BVX_StockSwapToAcquireOptionsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Stock swap to acquire options, Amount    (210)BVX_StockSwapToAcquireOptionsAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
   (210)BVX_StockSwapToAcquireOptionsAmount
Accretion on convertible preferred stock       (932)BVX_AccretionOnConvertiblePreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(932)BVX_AccretionOnConvertiblePreferredStock
Net income (loss)       (17,282)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(17,282)us-gaap_NetIncomeLoss
Ending 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
Ending Balance, Shares at Dec. 31, 2014 17,854us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember