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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Total
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Beginning Balance, Amount at Dec. 31, 2011 | $ 18 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 25,356 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (3,257)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 22,117 us-gaap_StockholdersEquity
Beginning Balance, Shares at Dec. 31, 2011 | 17,618 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Options exercised, Shares | 28 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Options exercised, Amount |  | 20 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 20 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock based compensation |  | 161 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 161 us-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) |  |  | 617 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 617 us-gaap_NetIncomeLoss
Ending Balance, Amount at Dec. 31, 2012 | 18 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 25,517 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (2,640)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 22,895 us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2012 | 17,639 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Options exercised, Shares | 51 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Options exercised, Amount |  | 70 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 70 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock based compensation |  | 506 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 506 us-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 |  | 2,616 BVX_ConvertiblePreferredStockBeneficialConversionFeature / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 2,616 BVX_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 | 18 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 28,687 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (9,634)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 19,071 us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2013 | 17,684 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Options exercised, Shares | 221 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Options exercised, Amount |  | 469 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 469 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock based compensation |  | 388 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 388 us-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 | $ 18 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 29,334 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (27,848)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 1,504 us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2014 | 17,854 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |

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