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Stockholders' Equity - Summary of Non-Vested Stock Options (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested at beginning of period 614,468us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
Nonvested, Shares, Granted 420,480us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Nonvested, Shares, Vested (301,472)us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
Nonvested, Shares, Forfeited (77,929)us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares
Nonvested at end of period 655,547us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
Weighted Average Grant Date Fair Value, Nonvested at December 31, 2014 $ 5.48us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
Nonvested at December 31, 2014, Aggregate Intrinsic Value $ 2,510bdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonvestedOptionsAggregateIntrinsicValue