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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net Income (loss)	$ (17,282)us-gaap_NetIncomeLoss	$ (4,339)us-gaap_NetIncomeLoss	$ 617us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	731us-gaap_DepreciationDepletionAndAmortization	739us-gaap_DepreciationDepletionAndAmortization	742us-gaap_DepreciationDepletionAndAmortization
Amortization of intangible assets	145us-gaap_DepreciationAndAmortization	88us-gaap_DepreciationAndAmortization	115us-gaap_DepreciationAndAmortization
Provision for inventory obsolescence	733us-gaap_InventoryWriteDown	12us-gaap_InventoryWriteDown	(93)us-gaap_InventoryWriteDown
Gain (loss) on disposal of property and equipment, net	14us-gaap_GainLossOnDispositionOfAssets	16us-gaap_GainLossOnDispositionOfAssets	(41)us-gaap_GainLossOnDispositionOfAssets
Stock-based compensation	388us-gaap_ShareBasedCompensation	506us-gaap_ShareBasedCompensation	161us-gaap_ShareBasedCompensation
Non cash other income - warrants	7,285us-gaap_OtherNoncashIncome	884us-gaap_OtherNoncashIncome	(20)us-gaap_OtherNoncashIncome
Benefit (provision) for deferred income taxes	3,975us-gaap_OtherNoncashIncomeTaxExpense	(1,613)us-gaap_OtherNoncashIncomeTaxExpense	210us-gaap_OtherNoncashIncomeTaxExpense
Changes in current assets and liabilities:
Trade receivables	(3)us-gaap_IncreaseDecreaseInAccountsReceivable	884us-gaap_IncreaseDecreaseInAccountsReceivable	(658)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses	(259)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	406us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	(241)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Inventories	1,955us-gaap_IncreaseDecreaseInInventories	(884)us-gaap_IncreaseDecreaseInInventories	287us-gaap_IncreaseDecreaseInInventories
Deposits and other assets	952us-gaap_IncreaseDecreaseInDeposits	(234)us-gaap_IncreaseDecreaseInDeposits	(227)us-gaap_IncreaseDecreaseInDeposits
Accounts payable	494us-gaap_IncreaseDecreaseInAccountsPayable	257us-gaap_IncreaseDecreaseInAccountsPayable	(284)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued and other liabilities	455us-gaap_IncreaseDecreaseInAccruedLiabilities	742us-gaap_IncreaseDecreaseInAccruedLiabilities	(403)us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash (used in) provided by operating activities	(417)us-gaap_NetCashProvidedByUsedInOperatingActivities	(2,536)us-gaap_NetCashProvidedByUsedInOperatingActivities	165us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities
Purchases of property and equipment	(630)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(588)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	(753)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities	(630)us-gaap_NetCashProvidedByUsedInInvestingActivities	(588)us-gaap_NetCashProvidedByUsedInInvestingActivities	(753)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities
Proceeds from convertible preferred stock, options and warrants	259us-gaap_ProceedsFromStockOptionsExercised	7,048us-gaap_ProceedsFromStockOptionsExercised
Change in restricted cash	(899)us-gaap_IncreaseDecreaseInRestrictedCash
Proceeds from mortgage note payable	3,173us-gaap_RepaymentsOfLongTermDebt
Repayment of long-term debt	(3,257)BVX_RepaymentOfIndustrialRevenueBonds	(162)BVX_RepaymentOfIndustrialRevenueBonds	(130)BVX_RepaymentOfIndustrialRevenueBonds
Repurchase of warrants	(420)us-gaap_PaymentsForRepurchaseOfWarrants
Net cash provided by (used in) financing activities	(1,144)us-gaap_NetCashProvidedByUsedInFinancingActivities	6,886us-gaap_NetCashProvidedByUsedInFinancingActivities	(130)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net change in cash and cash equivalents	(2,191)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	3,762us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(718)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period	7,924us-gaap_CashAndCashEquivalentsAtCarryingValue	4,162us-gaap_CashAndCashEquivalentsAtCarryingValue	4,880us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period	5,733us-gaap_CashAndCashEquivalentsAtCarryingValue	7,924us-gaap_CashAndCashEquivalentsAtCarryingValue	4,162us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid for:
Interest paid, net	151us-gaap_InterestPaid	195us-gaap_InterestPaid	232us-gaap_InterestPaid
Income taxes

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