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Stockholders' Equity - Additional information (Detail) (USD $)
1 Months Ended 3 Months Ended
Feb. 28, 2015
Executives
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Term of options granted period   10 years    
Vesting period of shares   3 years    
Unrecognized compensation cost related to non-vested share-based compensation awards granted   $ 40,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Unrecognized compensation cost related to non-vested share-based compensation awards granted year   2018    
Stock option exercisable   2,633,424us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber    
Warrants Outstanding   3,174,102us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber   3,196,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Securities excluded from computation of diluted earnings per share   9,400,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 10,700,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount  
Number of executive officers from whom swing profits were recovered 1bdsi_NumberOfExecutiveOfficers      
Short swing profits recovered 6,000bdsi_AdjustmentToAdditionalPaidInCapitalShortSwingProfitRecovery      
Fair market value of RSUs granted   30,800,000bdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodFairValue    
Vesting period of options   3 years    
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Company Issued, RSUs   2,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Warrant [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Warrants Outstanding   284us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_WarrantMember
   
Weighted Average Exercise Price   $ 3.12us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_WarrantMember
   
Directors and Employees [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Company Issued, RSUs   87,693us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_TitleOfIndividualAxis
= bdsi_DirectorsAndEmployeesMember
   
Fair market value of shares granted   $ 800,000bdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedInPeriodFairValue
/ us-gaap_TitleOfIndividualAxis
= bdsi_DirectorsAndEmployeesMember