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Difference between Consolidated Income Tax Benefit and Amount Computed by Federal Statutory Income Tax Rate (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax benefit at federal statutory rate	$ (30,818,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (22,678,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ (23,650,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State tax	1,204,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	(178,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	(89,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Business credits	(1,484,000)us-gaap_IncomeTaxReconciliationTaxCredits	(2,515,000)us-gaap_IncomeTaxReconciliationTaxCredits
Deferred compensation charges	2,710,000dvax_IncomeTaxReconciliationDeferredCompensationCharges	3,072,000dvax_IncomeTaxReconciliationDeferredCompensationCharges	1,002,000dvax_IncomeTaxReconciliationDeferredCompensationCharges
Change in valuation allowance	28,093,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	22,354,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	21,966,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other	295,000us-gaap_IncomeTaxReconciliationOtherAdjustments	(55,000)us-gaap_IncomeTaxReconciliationOtherAdjustments	771,000us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense	$ 0us-gaap_IncomeTaxExpenseBenefit	$ 0us-gaap_IncomeTaxExpenseBenefit	$ 0us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Name Accounting Standards Codification

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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