Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net (loss) income	$ (54,218)us-gaap_NetIncomeLoss	$ (57,394)us-gaap_NetIncomeLoss	$ 1,652us-gaap_NetIncomeLoss
Adjustments to reconcile net (loss) income to net cash flows from operating activities
Depreciation	123	207	466
Accretion of debt discount	642us-gaap_AccretionExpense	164us-gaap_AccretionExpense
Amortization of intangible assets	972us-gaap_AmortizationOfIntangibleAssets	1,140us-gaap_AmortizationOfIntangibleAssets	1,021us-gaap_AmortizationOfIntangibleAssets
Derivative (gain) loss	13,167	(121)	5,594
Impairment loss on assets	295us-gaap_AssetImpairmentCharges
Stock-based compensation expense	6,883us-gaap_ShareBasedCompensation	3,327us-gaap_ShareBasedCompensation	1,619us-gaap_ShareBasedCompensation
Purchase of Arcion license with common stock		2,072
Changes in assets and liabilities:
Accounts receivable	(347)	(2,273)	(420)
Inventories	(1,828)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(2,252)	(68)	4
Accounts payable and accrued expenses	4,325	(656)	5,568
Income taxes payable			129
Deferred revenue	3,405	(6,500)	(3,446)
Net cash flows from operating activities	(28,833)	(60,102)	12,187
Investing activities:
Purchase of equipment	(1,603)	(77)	(39)
Purchase of intangible assets			(1,050)
Net cash flows from investing activities	(1,603)	(77)	(1,089)
Financing activities:
Proceeds from sales of securities	72,662		38,373
Proceeds from exercise of stock options	4,580	357	2,054
Proceeds from exercise of common stock warrants	7,741us-gaap_ProceedsFromWarrantExercises	50us-gaap_ProceedsFromWarrantExercises	921us-gaap_ProceedsFromWarrantExercises
Payment on note payable	(7,333)us-gaap_RepaymentsOfNotesPayable
Proceeds from notes payable and warrants		20,000us-gaap_ProceedsFromSecuredNotesPayable
Return of short swing profits	82bdsi_ReturnOfShortSwingProfits
Payment of deferred financing fees		(241)us-gaap_PaymentsOfFinancingCosts
Repayment of related party advances			(7)
Net cash flows from financing activities	77,732	20,166	41,341
Net change in cash and cash equivalents	47,296	(40,013)	52,439
Cash and cash equivalents at beginning of year	23,176	63,189	10,750
Cash and cash equivalents at end of year	70,472	23,176	63,189
Cash paid for interest	1,386us-gaap_InterestPaid	742us-gaap_InterestPaid
Cash paid for taxes		$ 80us-gaap_IncomeTaxesPaidNet

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