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Fair Value Hierarchy for Financial Assets Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	$ 128,889	$ 187,610
Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	17,973	20,013
U.S. Government Agency Securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	110,916	167,597
Fair Value, Inputs, Level 1
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	17,973	20,013
Fair Value, Inputs, Level 1 | Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	17,973	20,013
Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	110,916	167,597
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Assets	$ 110,916	$ 167,597

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- Details

Name:	dvax_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisLineItems
Namespace Prefix:	dvax_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant