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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 | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | $ 87,093 | $ 123,588
Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 15,142 | 3,140
US Government Agencies Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 69,076 | 119,233
US Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 2,500 | 500
Municipal Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 375 | 715
Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 15,142 | 3,140
Fair Value, Inputs, Level 1 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 15,142 | 3,140
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 71,951 | 120,448
Fair Value, Inputs, Level 2 | US Government Agencies Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 69,076 | 119,233
Fair Value, Inputs, Level 2 | US Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 2,500 | 500
Fair Value, Inputs, Level 2 | Municipal Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | $ 375 | $ 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