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Nature of Operations and Business Risks - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Product
Dec. 31, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Number of approved products 5bmrn_NumberOfProductsApproved  
Accumulated deficit $ (849,770)us-gaap_RetainedEarningsAccumulatedDeficit $ (715,801)us-gaap_RetainedEarningsAccumulatedDeficit