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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, 2012 | Dec. 31, 2011
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | $ 123,588 | $ 111,671
Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 3,140 | 17,171
US Government Agencies Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 119,233 | 28,495
US Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 500 | 7,425
Municipal Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 715 |
Corporate Debt Securities, Secured by the U.S. Government |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets |  | 58,580
Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 3,140 | 17,171
Fair Value, Inputs, Level 1 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 3,140 | 17,171
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 120,448 | 94,500
Fair Value, Inputs, Level 2 | US Government Agencies Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 119,233 | 28,495
Fair Value, Inputs, Level 2 | US Treasury Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 500 | 7,425
Fair Value, Inputs, Level 2 | Municipal Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets | 715 |
Fair Value, Inputs, Level 2 | Corporate Debt Securities, Secured by the U.S. Government |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets |  | $ 58,580

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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