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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 | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | $ 152,671 | $ 187,610
Money Market Funds |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | 15,390 | 20,013
U.S. Government Agency Securities |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | 137,281 | 167,597
Fair Value, Inputs, Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | 15,390 | 20,013
Fair Value, Inputs, Level 1 | Money Market Funds |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | 15,390 | 20,013
Fair Value, Inputs, Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | 137,281 | 167,597
Fair Value, Inputs, Level 2 | U.S. Government Agency Securities |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | $ 137,281 | $ 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