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RETIREMENT PLAN - NARRATIVE (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract] |  |  |
Defined contribution plan, vesting period (in years) | 3 years |  |
Defined contribution plan, vesting percentage after 3 years (as a percent) | 100.00% |  |
Defined contribution plan, employer matching contribution (as a percent) | 50.00% |  |
Defined contribution plan, percent of employees' gross pay (as a percent) | 3.00% |  |
Company matching contributions | $ 0.3 | $ 0.2 | $ 0.1

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- Definition Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage After Three Years + References No definition available. + Details
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- Definition Defined Contribution Plan, Employers Matching Contribution, Vesting Period + References No definition available. + Details
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Namespace Prefix: | bvx_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration