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STOCK OPTIONS (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Number of options, outstanding    
Outstanding, beginning of period (in shares) 2,467,046us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 1,879,461us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Granted (in shares) 592,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 897,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Reinstated (in shares)   94,285BVX_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsReinstatedInPeriodGross
Exercised (in shares) (107,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised (51,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Cancelled (in shares)    (352,700)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Cancelled and Forfeited (In shares) (87,857)BVX_CancelledAndForfeitedInShares   
Outstanding, end of period (in shares) 2,864,189us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2,467,046us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Exercisable, end of period (in shares) $ 1,376,754BVX_ExercisableEndOfPeriodInShares  
Weighted average exercise price    
Outstanding, beginning of period (in dollars per share) $ 3.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 3.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Granted (in dollars per share) $ 592,000us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice $ 2.36us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Reinstated (in dollars per share)    $ 7.00BVX_ReinstatedInDollarsPerShare
Exercised (in dollars per share) $ 107,000us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice $ 1.38us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Cancelled (in dollars per share) $ (15,357)us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice $ 3.13us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Outstanding, end of period (in dollars per share) $ 3.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 3.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Exercisable, end of period (in dollars per share) $ 4.32BVX_ExercisableEndOfPeriodInDollarsPerShare