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Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | $ 187,610 | $ 123,588
Fair Value, Inputs, Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | 20,013 | 3,140
Fair Value, Inputs, Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | 167,597 | 120,448
Money market funds |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | 20,013 | 3,140
Money market funds | Fair Value, Inputs, Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | 20,013 | 3,140
US Government Agencies Debt Securities |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | 167,597 | 119,233
US Government Agencies Debt Securities | Fair Value, Inputs, Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets | 167,597 | 119,233
US Treasury Securities |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets |  | 500
US Treasury Securities | Fair Value, Inputs, Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets |  | 500
Municipal Securities |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets |  | 715
Municipal Securities | Fair Value, Inputs, Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |
Assets |  | $ 715

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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