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v3.21.1

Subsequent Event - Additional Information (Detail) - CEPI Member - Reservation Agreement - USD ($) | May 03, 2021 | Mar. 31, 2021
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Subsequent Event [Line Items] |  |
Interest- free unsecured forgivable loan |  | $ 99,000.0
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Increase in interest free unsecured forgiveable loan maximum borrowing capacity | $ 77,400 |
Interest free unsecured forgiveable loan Maximum borrowing capacity | $ 176,400 |

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- Definition Forgivable loan. + References No definition available. + Details
Name: | dvax_ForgivableLoan
Namespace Prefix: | dvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Increase In Interest Free Unsecured Forgiveable Loan Maximum Borrowing Capacity. + References No definition available. + Details
Name: | dvax_IncreaseInInterestFreeUnsecuredForgiveableLoanMaximumBorrowingCapacity
Namespace Prefix: | dvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Interest Free Unsecured Forgiveable Loan Maximum Borrowing Capacity . + References No definition available. + Details
Name: | dvax_InterestFreeUnsecuredForgiveableLoanMaximumBorrowingCapacity
Namespace Prefix: | dvax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_CounterpartyNameAxis=dvax_CoalitionForEpidemicPreparednessInnovationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=dvax_ReservationAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |