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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating activities:    
Net loss $ (8,193)us-gaap_NetIncomeLoss $ (4,644)us-gaap_NetIncomeLoss
Depreciation 85us-gaap_DepreciationDepletionAndAmortization 11us-gaap_DepreciationDepletionAndAmortization
Accretion of debt discount 162us-gaap_AccretionExpense 161us-gaap_AccretionExpense
Amortization of intangible assets 242us-gaap_AmortizationOfIntangibleAssets 243us-gaap_AmortizationOfIntangibleAssets
Derivative loss   4,825us-gaap_DerivativeGainLossOnDerivativeNet
Stock-based compensation expense 3,507us-gaap_ShareBasedCompensation 1,147us-gaap_ShareBasedCompensation
Changes in assets and liabilities:    
Accounts receivable 109us-gaap_IncreaseDecreaseInAccountsReceivable 262us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (722)us-gaap_IncreaseDecreaseInInventories  
Prepaid expenses and other assets 177us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (73)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses 127us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (1,255)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Deferred revenue (499)us-gaap_IncreaseDecreaseInDeferredRevenue (66)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash flows from operating activities (5,005)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 611us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Investing activities:    
Purchase of equipment (144)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (842)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash flows from investing activities (144)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (842)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Financing activities:    
Proceeds from sales of securities   62,037us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Proceeds from exercise of stock options 131us-gaap_ProceedsFromStockOptionsExercised 2,560us-gaap_ProceedsFromStockOptionsExercised
Proceeds from exercise of common stock warrants   2,575us-gaap_ProceedsFromWarrantExercises
Payment on note payable (2,001)us-gaap_RepaymentsOfNotesPayable (2,000)us-gaap_RepaymentsOfNotesPayable
Return of short swing profits 6bdsi_ReturnOfShortSwingProfits 82bdsi_ReturnOfShortSwingProfits
Net cash flows from financing activities (1,864)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 65,254us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net change in cash and cash equivalents (7,013)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 65,023us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 70,472us-gaap_CashAndCashEquivalentsAtCarryingValue 23,176us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 63,459us-gaap_CashAndCashEquivalentsAtCarryingValue 88,199us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid for interest $ 269us-gaap_InterestPaid $ 432us-gaap_InterestPaid