Annual report pursuant to Section 13 and 15(d)

Federal Income Tax Provision Compared With Statutory Rates (Detail)

v2.4.1.9
Federal Income Tax Provision Compared With Statutory Rates (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Statutory regular federal income tax rate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate (34.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Change in valuation allowance 37.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 27.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (13.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Tax return to prior year provision adjustments   (0.90%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes 16.20%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Expiration of federal net operating losses     28.20%biol_EffectiveIncomeTaxRateReconciliationFederalNetOperatingLossExpiration
Reduction of net operating loss attributes   (3.10%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther (3.70%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
State tax benefit (net of federal benefit) (3.30%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (4.20%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Research credits (1.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch  
Foreign amounts with no tax benefit (0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Non-deductible expenses 1.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 1.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 6.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Effect of change in rate 2.30%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 14.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate  
Other (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent 0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent
Total 0.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations (1.40%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 3.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations