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License and Development Agreements - Meda License, Development and Supply Agreements - Additional Information (Detail) (USD $)
 3 Months Ended 1 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Oct. 31, 2009
Revenue Recognition, Milestone Method [Line Items]      
Patent expiration year 2020    
Contracts revenue $ 11,408,000us-gaap_ContractsRevenue $ 11,284,000us-gaap_ContractsRevenue  
U.S. [Member]      
Revenue Recognition, Milestone Method [Line Items]      
Aggregate milestones and services revenue recognized     59,700,000us-gaap_DeferredRevenueRevenueRecognized
/ us-gaap_StatementGeographicalAxis
= country_US
U.S. [Member] | Milestones [Member]      
Revenue Recognition, Milestone Method [Line Items]      
Contracts revenue $ 1,000,000us-gaap_ContractsRevenue
/ us-gaap_StatementGeographicalAxis
= country_US
/ us-gaap_TypeOfArrangementAxis
= bdsi_MilestonesMember